Yearly Archives: 2020

Magneto-strictive Hydraulic Cylinder Position Sensor

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Hydraulic Cylinder Position Sensor is Designed for use in compact hydraulic cylinders

Magnetostrictive cylinder position sensor is a compact linear displacement sensor. Sino-Inst supplies cylinder position sensors suited to hydraulic and pneumatic applications. Cylinder position sensor output signals include: analog, SSI, Canopen.

  • Designed for use in compact hydraulic cylinders;
  • Linear measurement, absolute position output;
  • Measuring range: 50mm～2500mm, customized according to customer needs
  • Humidity/dew point: 90% humidity, no frost
  • Output signal: current, voltage
  • Power supply voltage: 9-32Vdc
  • Temperature range: -40℃ ～ +105℃
  • Electrical protection: IP67
  • Pressure resistance: 35MPa (continuous)/70MPa (peak)
Magneto-strictive Hydraulic Cylinder Position Sensor
RFQ
More Magnetostrictive Level Measurement

Specifications of Hydraulic Cylinder Position Sensor

Input
Measurement dataLinear displacement
Measuring stroke50mm-2500mm, can be customized according to user needs
Number of measurementsOne
Output
Voltage0.5～4.5Vdc  Maximum load resistance of the controller: ≥10kΩ)
Electric current4～20mA, 20～4mA, 0～20mA, 20～0mA      (Minimum/large load 0/250 Ω)
Accuracy
Resolution±0.1mm（50～400mm） Range÷4096（＞400mm）
Nonlinearity±0.1mm（50～400mm）   0.02%（＞400mm）
Repeat accuracy±0.1mm
Update time2.0ms
Working condition
Magnetic ring speedAny
Operating temperature-40～105℃
Humidity/Dew point90% humidity, no condensation
Temperature Coefficient<30ppm/℃
Impact indexGB/T2423.5 100g (11ms)
Vibration indexGB/T2423.10 25g/10-2000HZ
Electrical protectionIP67
EMC testGB/T17626.2/3/4/6/8, grade 4/3/4/3/3, Class A, CE certification; ISO13766, ISO11452-2/4
Structure and materials
Electronic warehouseStainless steel 304
RodStainless steel 304
Magnetic ringVarious magnetic rings
Outer tube pressure350bar/700bar (peak value) when installed in the liquid cylinder
Installation
Installation directionAny direction
Installation formElectronic warehouse outer circle
Electrical connections
Outgoing wayStraight out cable or aviation plug
Input voltage9-32Vdc
Power consumption1W
Polarity protectionMaximum -30Vdc
Overpressure protection36Vdc max
Insulation resistance＞10MΩ
Dielectric strength500V

Features of Magnetostrictive Hydraulic Cylinder Position Sensor

  • Compact structure: suitable for occasions with strict requirements on the installation space of the electronic head. It has a large number of applications in construction machinery
  • Rugged and durable: fully enclosed design. Adapt to harsh environments. The highest IP68 protection level
  • Straight line measurement: absolute output. No need to return to zero. Multiple signal interfaces are optional
  • Small size and easy to use.
  • Standard signal output, maintenance-free
  • Never wear: continuous non-contact measurement
  • Strong anti-interference and anti-vibration capabilities
  • Low power consumption. Effectively reduce system heating
  • Full range adjustable: 100% adjustable zero and full range
  • High resolution: resolution up to 1um

Magnetostrictive Cylinder Position Sensor analog output method

The MH series Magnetostrictive Cylinder Position Sensor has a built-in 16-bit D/A converter. It can accurately convert the absolute position of the vernier magnetic ring into a standard 4-20mA current signal or other signals in real time. The output signal has a linear relationship with the effective range. The zero point, full scale and positive and negative directions can be set by a screwdriver 100% according to the needs of on-site use. The output standard analog signal can be directly output to the PLC control module (such as Siemens 331 module) or other instruments.

Magnetostrictive Hydraulic Cylinder Position Sensor installation dimensions

MH series Magnetostrictive Cylinder Position Sensor, all built-in compact products. The size of the electronic head is only 48mm (diameter) × 21mm (thickness). It is suitable for built-in measurement occasions that have strict requirements on the installation space of the electronic head. Compact structure and strong anti-interference ability. It can be widely used in construction machinery, walking machinery, power machinery and other occasions. And it can be replaced with the same type of linear displacement sensor abroad.

Extended reading: Hydraulic oil flow measurement solutions.

Magnetostrictive Cylinder Position Sensor installation

MH series pressure-resistant outer tube, stainless steel electronic warehouse, specially designed for the use of hydraulic systems. Built into the hydraulic cylinder. Withstand pressure up to 35MPa continuous (70MPa peak).

Installation Notes:
To install the sensor housing, M5 DIN913 grub screws are required. The sensor can only be fixed in the direction of the axis. Since the screw can only contact the housing, the maximum torque to the screw can only be 1Nm. Otherwise the sensor housing will be damaged. And you need to remove the glue (such as Loctite Blue) to apply and seal the installed fixing sleeve screws.

Installation Precautions:

  • Cut off all sensor connections during welding!
  • Do not connect the ground terminal to the piston rod or the bottom of the cylinder.
  • If there are sensors inside the cylinder block, do not weld any part of the cylinder block.
  • If there are sensors inside the cylinder, do not weld near the cylinder.
  • Any place in contact with the welding machine may generate current or voltage. This is caused by the lubrication of the isolation bearing or the sliding part of the plastic part. In this case, the same consequences may be caused.

You may like: How does a hydraulic flow meter work?

The cylinder position sensor is mainly used to detect the position of the piston in the cylinder, and the user can directly install it in the cylinder. As a detection device, the sensor is the primary link to realize automatic control and automatic detection and can meet the various requirements of users for equipment information transmission, processing, storage, recording, display, and control.

The position sensor can be used to detect the position. A switch that reflects a certain state. Unlike the displacement sensor, the position sensor has two types: a contact type and proximity type.

The contact of the contact sensor is actuated by two objects contacting and squeezing. Common ones are travel switch, two-dimensional matrix position sensor, and so on. The travel switch has a simple structure, reliable action, and low price. When an object touches the travel switch during its movement, its internal contacts will act to complete the control. If travel switches are installed at both ends of the X, Y, and Z-axis of the machining center, the movement can be controlled. range. The two-dimensional matrix position sensor is installed on the inner side of the manipulator’s palm to detect the contact position between itself and an object.

A proximity switch refers to a switch that can send out an “action” signal when an object is close to a set distance, and it does not need to be in direct contact with the object. There are many types of proximity switches, mainly electromagnetic type, photoelectric type, differential transformer type, eddy current type, capacitive type, reed switch, Hall type, etc. The application of proximity switches on CNC machine tools is mainly tool holder selection control, worktable stroke control, oil cylinder and cylinder piston stroke control, etc.

Extended reading: Magnetostrictive Hydraulic Cylinder Position Sensor

Rated Products:

LD series Rigid Probe Magnetostrictive Level Transmitter
LR series Integral flange Magnetostrictive level sensor
LT series Digital Display Magnetostrictive liquid level sensor
LP series Magnetostrictive Tank Level Indicator-PVDF/ PPH/ PTFE/ PFA/ PP

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FAQ

What is hydrostatic level transmitter?

Hydrostatic level transmitter is actually a type of pressure transmitter. Hydrostatic level transmitter is the application of pressure transmitter to liquid level measurement. The submersible Hydostatic pressure level transmitter is based on the principle that the measured liquid static pressure is proportional to the height of the liquid. Piezoresistive effect using diffused silicon or ceramic sensitive elements. Convert static pressure into electrical signal. After temperature compensation and linear correction. Convert to 4-20mADC standard current signal output. In order to achieve liquid level measurement.

What is magnetostrictive transducer?

Magnetostrictive liquid level transmitter is a kind of liquid level sensor. But it uses the principle of magnetostrictive operation internally. And combines modern electronic technology to measure the time value between pulse waves to achieve the purpose of accurately measuring the liquid level . The magnetostrictive liquid level meter works with waveguide pulses. During the work, the measured displacement is determined by measuring the time of the start pulse and the end pulse, so the measurement accuracy is high.

How do you measure pressure using a level transmitter?

Usually we measure the liquid level by measuring the pressure.
When the liquid level transmitter is put into a certain depth in the measured liquid, the pressure formula of the sensor facing the liquid surface is: Ρ = ρ.g.H + Po. In the formula:
P: the pressure on the liquid face of the transmitter
Ρ: measured liquid density
G: local gravity acceleration
Po: atmospheric pressure on the liquid surface
H: Depth of transmitter into liquid
At the same time, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through the air-conducting stainless steel. Then connect the atmospheric pressure Po on the liquid surface to the negative pressure chamber of the sensor. To offset Po on the back of the sensor, the pressure measured by the sensor is: ρ.g.H. Obviously, by measuring the pressure P, the liquid level depth can be obtained.
Of course, if the liquid level is measured, the pressure value can also be converted.

Read more about: Common Types Of Heating Oil Tank Level Sensors

Sino-Inst offers over 10 Magnetostrictive Hydraulic Cylinder Position Sensors for measurement.

About 50% of these are liquid level meters, 40% is the tank level sensor. A wide variety of level meters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Magnetostrictive Hydraulic Cylinder Position Sensor, located in China.

Hydraulic Cylinder Position Sensor products are most popular in North America, Domestic Market, and South America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and ISO14001 certification.

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Magnetostrictive Level Transmitters

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Magnetostrictive Level Transmitters are level sensors for continuous level measurement. It is the best technology for monitoring and controlling liquid level interface.

Magnetostrictive Level Transmitters are used for continuous measurement of liquid level and interface. Magnetostrictive level measurement is currently the best liquid level measurement and control technology.Sino-Inst’s Magnetostrictive Level Transmitters can provide two independent outputs: interface; overall level. It can be applied when the difference in specific gravity drops to 0.02. Magnetostrictive Level Sensors Commonly used for the measurement of the oil-water interface. And others include acid tanks, propane containers, desalter and sewage tanks. Magnetostrictive Level Transmitters are composed of three parts: probe rod, circuit unit and magnetic float. The flexible cable type and the outer buoy type are derived from the basic model. And has a variety of communication modes 4~20mA, 0~5V, 0~10V, HART, RS-485 and so on.

Sino-Inst offers a variety of magnetostrictive level transmitters for industrial level measurement. If you have any questions, please contact our sales engineers.

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More Level Sensors

Featured Magnetostrictive Level Transmitters

Features of Magnetostrictive Level Transmitters

Magnetostrictive Level Transmitters are divided into three types: flexible probe type, hard probe type, and outer float isolation detection. The watch body contains two main parts: the electronic part and the sensing part. The advantages of Magnetostrictive Level Transmitters are:

  1. Strong reliability:
    Because the magnetostrictive liquid level gauge adopts the principle of waveguide, there is no mechanical movable part. Therefore, there is no friction and no wear. The entire converter is enclosed in a stainless steel tube and is not in contact with the measurement medium. The sensor works reliably and has a long life.
  2. High precision:
    Because the magnetostrictive liquid level gauge works with waveguide pulses. In the work, the measured displacement is determined by measuring the time of the start pulse and the end pulse. Therefore, the measurement accuracy is high and the resolution is better than 0.01%FS. The accuracy achieved.
  3. Good security:
    Magnetostrictive liquid level gauge has high explosion-proof performance. Intrinsically safe explosion-proof and safe to use. Especially suitable for the measurement of chemical raw materials and flammable liquids There is no need to open the tank lid during the measurement. Avoid the unsafeness of manual measurement.
  4. Easy to install and maintain:
    The magnetostrictive liquid level gauge is generally installed through the existing pipe opening on the top of the tank. It is especially suitable for the installation of underground storage tanks and storage tanks that have been put into operation. It can not affect normal production during the installation process.
  5. Facilitate system automation:
    The secondary instrument of the magnetostrictive liquid level gauge adopts the standard output signal. It is convenient for the computer to process the signal. It is easy to realize the network work and improve the automation degree of the entire measurement system.

Sensing part (ie probe rod):

The probe has a diameter of 5/8” and the end is sealed. The inside of the probe is hollow and equipped with precision magnetostrictive wires. In addition to the magnetostrictive wires, the probe can also hold up to 8 RTD The sensor is used to detect the temperature. The maximum length of the probe can be 23 meters, and the flexible cable structure is used above 6 meters.

Electronic part (ie controller):

The shell is made of aluminum alloy or 304 stainless steel. It is a double-chamber type (that is, the transmission part is separated from the wiring part). One of the chambers is a micro-processing module and a circuit board, and the micro-processing module has operation buttons. The other chamber is a binding post. There is a wire connected between the circuit board and the probe processing board. This wire should not be loosened without authorization from the manufacturer.

magnetostrictive level transmitter working principle

The magnetostrictive liquid level/boundary transmitter is designed using a physical phenomenon – the principle of magnetostriction. The specific working principle is as follows:

A fine magnetostrictive wire is installed in a non-magnetic sensing tube. A piezoelectric sensor is connected to one end of the magnetostrictive wire. The piezoelectric sensor sends 10 current pulse signals to the magnetostrictive wire every second. and time it.

The current pulse travels down the magnetostrictive wire. A circular magnetic field is generated that moves downward.

Magnetostrictive Level Sensor Operating Principle

The annular magnetic field interacts with the magnetic field of the magnetic float. A torsional stress wave is generated on the magnetostrictive line. This torsional stress wave travels from the float position up and down the magnetostrictive line at a known speed. Knowing The piezoelectric magnetic sensor receives this torsional stress wave signal.

The time interval between the initial current pulse wave and the return torsional stress wave can be known through the timing circuit. The position of the float can be determined according to the time interval. Since the float always floats on the liquid surface, the liquid level can be accurately determined s position.

Applicaitons of Magnetostrictive Level Transmitters

Industries served:Applications:
Oil and GasPosition Sensing
PetrochemicalSanitary Service
ChemicalValve Positioning
Power GenerationInventory Control
Water and wastewater treatmentCorrosive Process
Pulp and PaperUnderground Tanks
BiotechPrimary Level/Interface
Marine  Process Temperature and Level

Extended Reading: Low Cost Float Level Sensor for Tank Liquid Volume Monitoring

magnetostrictive level transmitter advantages and disadvantages

When the sensor of the magnetostrictive liquid level transmitter works, the circuit part of the sensor will excite a pulse current on the waveguide wire. When the current propagates along the waveguide wire, a pulsed current magnetic field is generated around the waveguide wire.

Magnetostrictive level transmitter advantages:

  1. The magnetostrictive liquid level gauge is suitable for liquid level measurement of clean liquid level with high precision requirements. The precision reaches 1mm, and the product precision can reach 0.1mm.
  2. It can be used to measure the interface between two different liquids.
  3. The biggest advantage of magnetostriction lies in its extremely high resolution, which can be at the micron level. A typical application is to measure the position of a rolling mill load hydraulic cylinder. But the design here is not the same as level measurement. The position measurement of the hydraulic cylinder is not that the hydraulic oil drives the magnetic ring (ie, the floating ball). Instead, the movable part of the cylinder body drives the magnetic ring to move through the mechanical structure, so the position is very clear. Usually, the precision requirements of the rolling mill for the thickness of the sheet are usually several to tens of microns. Therefore, the resolution of the magnetostrictive sensor must reach the micron level.
  4. The explosion-proof intelligent electronic circuit design can calculate the volume
  5. The movable part of the magnetostrictive liquid level gauge is a float, and the maintenance is extremely low. It is used in liquid level measurement of various storage tanks and has the characteristics of strong environmental adaptability and convenient installation.

Compared with liquid level gauges such as radar, it has a very high cost performance and many functions in short-range measurement. The display screen has current, temperature and interface display. This is exactly why the magnetostrictive level gauge can become one of the most common products used on metering tanks such as gas stations today.

Disadvantages of magnetostrictive level transmitter:

  1. The anti-interference ability is slightly poor (generally it is not recommended to be used in places with strong electromagnetic radiation such as power plants).
  2. It must be a contact measurement, but the real measurement unit is not in contact with the liquid, and only its protection tube is in contact with the liquid.
  3. The medium is in direct contact, and the floating ball sealing requirements are strict, and the viscous medium cannot be measured.
  4. Installation is limited. Higher installation and maintenance requirements, so the market is not widely used.

Extended reading: How To Select Hydraulic Flow Meter?

Magnetostrictive level transmitter price

The price of a magnetostrictive level transmitter is determined based on the measurement conditions. Sino-Instrument is a manufacturer of magnetostrictive level gauges. We offer magnetostrictive level gauges at the right price.

Selection considerations: 

1. The selection of the level gauge should be consistent with the environment of the media on the site. Including ambient temperature, pressure, vibration, shock, compatibility of structural materials and media, etc.   

2. When the temperature of the measured medium is high (100 ～ 200), it is recommended to choose a probe with an outer float type and use a side flange installation. When the temperature is higher (200 ~ 300), it is recommended to choose a probe with a side-bundled type with an outer float, and install it with a side flange.   

3. There are measurement dead zones at the upper and lower ends of the measuring rod of the magnetostrictive level gauge, which should be considered when selecting the range.   

4. The size of the stainless steel magnetic float commonly used for level gauges is Ф45 × 56 × Ф15, and flange connection of DN50 or above is required. For the liquid level gauge with thread connection, users need to install flange or bracket.

More Level Senors for Tank Level Measurement

Radar level transmitter, also called Radar level gauge. Non-contact Continuous level measurement in liquids and solids with free space radar sensors. Non-contacting radar, based on microwave technology, detects only surfaces that reflect energy. These transmitters work on the principle of a radar by using radio wave emissions. Mounted at the top of a tank filled with a liquid. The transmitter sends a radar signal into the liquid, and receives a reflection of the signal. The transmitters then analyze the current fill level of the tank based on the time taken by the transmitted signal to return.

Guided Wave Radar (GWR) Level Transmitters, also called wave guided radar level transmitter. Using guided wave radar technology, GWR level transmittershave no moving parts. They can measure both level and the interface between two media. Continuous level measurement in liquids and solids with guided wave radar sensors. These transmitters work by sending a microwave pulse through a sensor cable or rod. The signal hits the surface of the liquid, and travels back to the sensor, and then to the transmitter housing. Based on the time taken by the signal to travel down the sensor and back up again. The electronics integrated in the transmitter housing determine the filling level.

Hydrostatic level transmitters, also called submersible level transmitter, or pressure level transmitters. For Hydrostatic level measurement, Continuous level measurement in liquid applications with pressure sensors. These transmitters help in determining fluid level of a container. By measuring the pressure of resting body of the fluid within it.

Read more about: Hydrostatic Submersible Level Transmitter-Straight Rod Insertion

Ultrasonic Level Indicator, also called Ultrasonic level sensor, or ultrasonic level transmitter. In this type of transmitter, an ultrasonic transducer is mounted at, or near the top of a container containing liquid. The transducer sends out an ultrasonic pulse. The pulse hits the surface of the liquid, and gets reflected. The sensor then calculates the fill level based on the time between the transmitted and received signal.

Frequently
Asked
Questions

Help Center

Magnetostrictive liquid level transmitter is a kind of liquid level sensor. But it uses the principle of magnetostrictive operation internally. And combines modern electronic technology to measure the time value between pulse waves to achieve the purpose of accurately measuring the liquid level . The magnetostrictive liquid level meter works with waveguide pulses. During the work, the measured displacement is determined by measuring the time of the start pulse and the end pulse, so the measurement accuracy is high.

1.The device electronics generates a low energy current pulse at fixed intervals.
2.The electrical pulses create a magnetic field which travels down a specialized wire inside the sensor tube.
3.The interaction of the magnetic field around the wire and the magnetic float causes a torsional stress wave to be induced in the wire. This torsion propagates along the wire at a known velocity, from the position of the magnetic float and toward both ends of the wire.
4.A patented sensing element placed in the transmitter assembly converts the received mechanical torsion into an electrical return pulse.
5.The microprocessor-based electronics measures the elapsed time between the start and return pulses (Time of Flight). And converts it into a position measure-ment which is proportional to the level of the float.

The level of the liquid medium in the container is called the liquid level. And the instrument that measures the liquid level is called the liquid level transmitter. Level transmitter is a kind of level instrument. There are two types of level transmitterss, one is continuous and the other is point-off. The continuous level transmitter is a real-time monitor of the height of the liquid in the container. The point type, which generally takes two points, high and low, and outputs an alarm signal when the medium in the container reaches these two points.The types of liquid level transmitters is very wide. Specific include: magnetic flap liquid level gauge, tuning fork vibration type, differential pressure type, pressure type. Ultrasonic, magnetostrictive liquid level gauge, magnetic flap, radar and so on.
Levels of media such as: water, viscous fluids, and fuels, or dry media such as bulk solids and powders can be measured using the transmitter.
Level measurement transmitter are used in a myriad of applications that require level measurement within containers or tanks. These transmitters often find their application in material handling, food and beverage, power, chemical, and water treatment industries.
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Radar level transmitter is a kind of liquid level transmitter which uses the principle of radar operation.
Radar Level Sensor also called radar level transmitter, are the indicating transmitter for liquid level.
Non-contact Continuous level measurement in liquids and solids with free space radar sensors.
RADAR (Radio Detection And Ranging) is a device which can detect the presence of faraway objects by obtaining a reflection of electromagnetic waves emitted from the device itself. Although invented much earlier, wide deployment of radar was done by Britain during the Second World War to detect oncoming German bombers.
Radar level measurement is a safe solution. Even under extreme process conditions (pressure, temperature) and vapors. Various antenna versions for every kind of radar applications are available.
In continuous non-contact level measurement with radar, the sensor sends microwave signals towards the medium from above. The surface of the medium reflects the signals back in the direction of the sensor. Using the received microwave signals, the sensor determines the distance to the product surface and calculates the level from it.

Magnetostrictive probe technology provides underground storage tank and above ground storage tank owners a highly accurate device to measure and transmit water height, fluid height and temperature to a monitoring device. In addition, Veeder-Root probes support in-tank leak detection to assist in compliance management.

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Sino-Instrument offers over 10 Magnetostrictive level transmitters for level measurement. About 50% of these are Magnetostrictive liquid level meters, 40% is the tank level sensor.

A wide variety of Magnetostrictive level meters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Magnetostrictive level measurement instrumentation, located in China.

Request a Quote

Please enable JavaScript in your browser to submit the form

LP series Magnetostrictive Tank Level Indicator

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Tank Level Indicator is important for liquid level monitoring of industrial storage tanks. Magnetostrictive Tank Level Indicator is suitable for corrosive liquids. PVDF/ PPH/ PTFE/ PFA/ PP are optional.

Tank Level Indicator is based on the basic model of magnetostrictive level sensor, using corrosion-resistant materials. The shell structural parts are all made of anticorrosive materials such as PVDF/PPH. It is widely used in the media conditions of strong acid and alkali such as petrochemical industry and new energy. For fuel oil tank, explosion proof is optional.

Sino-Inst offers a variety of Magnetostrictive Tank Level Indicators for industrial level measurement. If you have any questions, please contact our sales engineers.

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More Magnetostrictive Level Measurement

Featured Tank Level Indicators

Rigid Probe Magnetostrictive Level Transmitter
Integral flange Magnetostrictive level sensor
Digital Display Magnetostrictive liquid level sensor
Multi-Point Liquid Level Float Switch
Magnetic Float Level Sensor-Reed Switch
Portable Ultrasonic Liquid Level Indicator
Hydrostatic level transmitter-Rod Type
Differential pressure(DP) level transmitter

Features of Magnetostrictive Tank Level Indicator

  • The shell is made of Teflon (Teflon) and other materials, resistant to strong acids and bases. Suitable for super corrosive environment.
  • The effective stroke is 0～20000mm, and the range can be customized.
  • There are voltage, current, analog/485 digital/can bus, and various signal output options.
  • Built-in imported waveguide wire as the measuring unit. After DSP digital signal processing. High precision, no temperature drift, no contact. Life span up to 20 years;
  • Strong adaptability to temperature environment; the pole can withstand high temperature 300C°.
  • Pressure resistance and corrosion resistance, float pressure 1.5MPa. It can be applied to most corrosive liquid level measurement applications such as strong acids and bases.
  • Protection grade IP68
  • Strong anti-interference ability
  • High precision
  • Low power consumption and high cost performance;
  • Easy to disassemble and install;
  • Non-contact measurement, high stability.
  • The absolute value displacement measurement is not affected by power failure;
  • Can replace LVDT, electronic ruler, encoder and other displacement sensors.

Specifications of Magnetostrictive Tank Level Indicator

Range (mm)50～2000mm or customized according to customer needs
Power supply voltage: +11VDC~+36VDC
Output form/working voltage: Analog signal: 4~20mADC, 0~5VDC, 1~5VDC, 0~10VDC (+15VDC~+36VDC) Digital signal: RS485
Load capacity: Voltage signal output load ≥1KΩ. Current signal output load ≤1KΩ
Non-linear error: ±0.05%FS; maximum error 100μm below 200mm
Repeatability error: better than 0.005%FS
Resolution: better than 0.005%FS
Hysteresis: better than 0.002%FS
Working temperature: 0~+70℃ -15~+60℃ -25~+70℃ -40~+85℃
Rod material: 0Cr18Ni9 (304) 316 stainless steel (special customization)
Electronic enclosure shell material: 0Cr18Ni9 (304) 316 stainless steel (special customization)
Lead way: PVC shielded cable. Default length: 1m, also available according to user requirements. Aviation plug (not applicable to explosion-proof products) terminal
Enclosure protection level: IP68

Tank level indicator float type

Float level sensor (float switch) is one type continuous level sensor for industrial level measurement. Float level sensor has a magnetic float that rises and falls as liquid level changes. The movement of the float creates a magnetic field. Through the magnetic coupling effect, the internal resistance of the sensor changes linearly. The resistance change is converted into a standard current signal of 4 ~ 20mA by an intelligent converter. The percentage of the liquid level, 4 ~ 20mA current and liquid level value, can be displayed on site. Applications like: water tank, fuel tank, level measurement and level control. Vertical, horizontal, and side mounted, all can be satisfied

Extended reading: Industrial Tank level indicators and Tank Level Gauges.

Large water tank level indicator

The water level sensor of your water tank is an essential component. If not repaired or replaced, a sensor can become damaged over time and fail entirely. Too much water can cause a malfunction and too little water means inadequate water pressure. Either way, repairing or replacing holding tanks is an expensive task you shouldn’t have to undertake because of sub-par sensors.
With Sino-Inst’s water tank level sensors, there’s nothing to break down or rust and our models have a 99% success rate!

In the high unlikely event that you experience any issues with your product, call us and we’ll replace or repair it immediately at no charge.

Read more about our water tank level sensors and control systems.

About Level Sensor Types and how they work, OMEGA Engineering has a good explanation. Video source: https://www.youtube.com/watch?v=bHxEXlIHSHY&feature=emb_logo

Propane tank level indicator

Propane, three-carbon alkane, chemical formula is C3H8, structural formula is CH3CH2CH3. Colorless, liquefied gas is slightly soluble in water, soluble in ethanol and ether Mixed with air to form explosive mixture. Exist in natural gas and petroleum pyrolysis gas. The chemical properties are stable, and chemical reactions are not easy to occur. Used as refrigerant, internal combustion engine fuel or organic synthetic raw materials.

A propane gauge shouldn’t be hard to pick, and it shouldn’t cost a lot of money. We know that, so we’re going to show you how to pick the best propane tank gauges.

See if there is stirring in the tank. If there is a mixer, then add a measuring tube on the side of the tank. Generally, the magnetic flap level gauge, float level gauge or magnetostrictive level gauge are commonly used.

It also depends on your working conditions, such as temperature and pressure to measure the density of the medium, and whether your spherical tank is supported.

The external measuring liquid level gauge is also called an externally attached ultrasonic liquid level gauge. Its working principle is ultrasonic echo ranging. That is, the ultrasonic wave is transmitted through the tank wall in the liquid medium and returned to the liquid level to be received by the sensor. Through its time difference To calculate the liquid level height, on-site OLED display.

At the same time realize the remote transmission of the monitoring liquid level and realize automatic control. Also suitable for liquid level measurement of liquefied gas, propylene, propane, ethane spherical tank.

💡 Industrial Propane Tank Level Indicators for Industrial Tank Level Measurement

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FAQ

What is magnetostrictive level transmitter?

Magnetostriction means that the change of the magnetization direction in ferromagnetic substance will cause the change of the medium lattice spacing. As a result, the length and volume of the ferromagnetic substance change.
Magnetostrictive level transmitter is a level transmitter based on the principle of magnetostriction. It is a high-precision, high-resolution transmitter driven by a magnetic float.

How does a magnetostrictive sensor work?

1. When the sensor of the magnetostrictive level transmitter works, the circuit part of the sensor will excite a pulse current on the waveguide wire.
2. When this current propagates along the waveguide wire, a pulsed current magnetic field is generated around the waveguide wire.
3. There is a float outside the sensor rod of the magnetostrictive liquid level gauge. This float can move up and down along the rod with the change of liquid level.
4. Inside the float there is a set of permanent magnetic rings. When the pulsed current magnetic field and the magnetic ring magnetic field generated by the float want to meet. The magnetic field around the float changes so that the waveguide wire made of magnetostrictive material generates a torsional wave pulse at the position of the float.
5. This pulse is transmitted back along the waveguide wire at a fixed speed and detected by the detection mechanism.
6. The position of the float, that is, the position of the liquid surface can be accurately determined by measuring the time difference between the pulse current and the torsional wave.

What is flow and level sensor?

1. Flow sensor is a kind of detection instrument used to detect the flow parameters of liquid, gas and other media and convert it to other forms of signals for output. The flow sensor has many advantages such as small size, light weight, intuitive and clear reading, high reliability, and no pressure loss.
1. Level sensor is a sensor that can replace manual measurement. The liquid level sensor can convert the height of the liquid level into an electrical signal for output, so as to achieve the purpose of controlling the liquid level.

Read more about: Ultrasonic Tank Level Sensors for Tank Level Monitoring

Sino-Inst offers over 10 Tank Level Indicators for level measurement.

About 50% of these are Magnetostrictive liquid level sensors, 40% is the tank level sensor. A wide variety of level meters options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

Tank Level Indicator products are most popular in North America, Domestic Market, and South America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and ISO14001 certification.

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Wireless Pressure Sensors

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Wireless pressure sensors are a game changer for many industries. No longer do you have to worry about wiring costs or maintenance. Our wireless battery powered pressure monitoring system offers long range connectivity via Bluetooth, or GPRS-NB-iot-LORA. It allows you to keep an eye on water pressure and offers differential pressure monitoring. With the help of our wireless pressure sensors, you’ll be able to keep a close eye on your operations without the need for a controller or indicator.

Sino-Inst offers a variety of Wireless Pressure Sensors for industrial pressure measurement. If you have any questions, please contact our sales engineers.

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More Pressure Sensors

Featured Wireless Pressure Sensors

SI2088-W Wireless Pressure Transmitter
SI-1110 Wireless Pressure Transducer

Features of Wireless Pressure Sensors

  • Ultra-low power consumption design. 60UA in sleep mode (3.6VDC battery power supply)
  • NB-iot Narrowband Internet of Things. Supporting our company’s Internet of Things cloud acquisition and monitoring platform.
  • Online monitoring. PC and mobile data applications. Real-time/historical/alarm data query.
  • On-site low-power five-digit display header. Continuous display and trigger display can be divided (optional)
  • Remote configuration: Remote configuration of parameters such as acquisition frequency/sending frequency/upper and lower alarm limits.
  • Data communication protocol MODBUS TCP. .
  • Dual power supply. The battery is powered by 3.6VDC/7.2 VDC lithium sub-battery. The battery life depends on the frequency cycle of the collected data. Generally it can be used for about 2-5 years. External power supply 5-30VDC.
  • High-precision 24-bit ADC collects and digitizes sensor signals.
  • Enhanced EMC anti-interference design. It is suitable for various industrial environments with harsh electromagnetic environment.
  • Abnormal alarm: abnormal alarm of overvoltage and undervoltage/low battery in the pipeline network
  • 24hX365 online monitoring. The data server records data for several years.
  • Open cloud platform API interface/MODBUS-TCP interface. Seamlessly connect with user’s industrial configuration system, customized software and special platform.
  • The installation location of NB-iot IoT products must have NB-iot base station signal. Special IoT card. Low cost and low traffic, annual use.

Low power-battery powered

The low-power wireless pressure transmitter adopts advanced micro-power devices and perfect software management technology. Ensure the real-time performance of data monitoring and instrument status. Built-in large-capacity high-performance lithium battery, which can work continuously for 2-5 years.

Realize remote real-time monitoring, wireless transmission, no need for on-site wiring, saving manpower and construction costs.

The instrument is advanced in design, easy to install and use, and is an ideal upgrade product for traditional pressure transmitters.

Application of wireless pressure sensor

Wireless pressure sensors are mainly used in the following four aspects:

  1. In the power industry. Wireless pressure sensors can be used in data transmission fields such as reactive power compensation, power distribution monitoring, meter collection, and street lamp monitoring.
  2. In the water application industry. Water meter collection, remote monitoring of water resources management, wireless communication of waterway network monitoring.
  3. In the field of environmental protection. Online monitoring system of pollution sources such as CEMS, water quality online monitoring, etc.
  4. In the field of equipment maintenance. Such as elevator monitoring, air conditioning monitoring, etc.. Pressure sensors can be quickly embedded in the user’s monitoring instruments to complete the device monitoring GPRS remote transmission application.

Read more about: What is industrial pressure transmitter?

NB-IoT Wireless Pressure Transmitter Networking Solution

Petroleum pipelines have the characteristics of large diameter, high pressure and large transmission volume. In the process of oil and gas transportation, the pressure transmitter is used to effectively monitor the pressure of the oil pipeline. Further prevent the occurrence of oil and gas pipeline leakage accidents and ensure the safe operation of oil and gas pipelines.

Industry pain points:

  1. The energy transmission pipeline covers a wide area, and the pressure monitoring system based on the wired network is costly and difficult to deploy;
  2. The pressure transmitter is often placed under the ground along with the pipeline. Once installed, it is not easy to replace. A low-power wireless networking solution is required to extend battery life.

NB-IoT wireless pressure transmitter integrates pressure detection, data acquisition, NB-IoT wireless communication, battery self-power supply and other functions. Realize high-precision measurement, automatically set the collection frequency and reporting frequency. Use NB-IoT network to upload data.

Background staff can set alert values for pressure data. Once the warning value is reached, measures to automatically close the valve can be taken immediately. Send work orders to maintenance personnel for quick processing.

The NB-IoT network covers a wide range. Under the same frequency band, NB-IoT has a gain of 20dB compared with the existing network, which is equivalent to improving the coverage area by 100 times. At the same time, it meets the coverage depth of the underground pipe network to ensure that there are no blind spots in the network;

NB-IoT can support massive IoT terminal connections. Supports low latency sensitivity and ultra-low device power consumption. Terminal standby time can reach more than 10 years;

The wireless pressure transmitter can collect, display, measure, report and store metering data in real time. Synchronously upload to the management platform. Ensure that the background personnel can monitor the pipeline status in real time.

Wireless Level Sensor – LoRa

The Wireless Level Sensor upgrades the LoRa wireless transmission function based on the Hydrostatic Level transmitter. Measure water or oil level. This product adopts the LORA debugging method, which can greatly increase the communication distance. It can be widely used in the field of short-distance Internet of Things wireless communication in various occasions.

Read More about: Wireless Level Sensor – LoRa

Wireless pressure sensor system

The rapid development of wireless communication technology and computer technology has been applied to sensor technology. It makes wireless data collection of pressure sensors possible. Its unique performance is more advantageous than traditional pressure sensors. It can be used in areas where wiring and power supply are difficult, areas where people cannot reach. Such as high temperature, severe cold, high humidity areas, contaminated areas or areas where the environment is destroyed. And some temporary occasions. Realized the sensing system Remote testing. This is also an inevitable trend of testing in the information age.

System design

The pressure sensor wireless acquisition system designed in this paper is composed of the front-end sensor data acquisition transmitter part and the terminal data receiver part. Figure 1 shows the block diagram of the transmitter part (upper) and the receiver part (lower) of the sensor data collection.

The sensor data acquisition and transmission part is composed of a pressure sensor, a temperature sensor, a signal processing part, a microprocessor (generally a microcontroller) and a wireless transmission circuit.

Pressure and temperature sensors acquire pressure and temperature values ​​of the surrounding environment.

The signal processing part includes the preceding channel, program-controlled amplifier and A/D converter. Its function is to extract and amplify the analog signal of the sensor under program control and perform analog/digital conversion.

The microprocessor is responsible for controlling the work of each part of the system and processing digital signals. The wireless transmission circuit is under the control of the microprocessor. The encoder encodes and processes the collected information data and transmits it with the transmission module.

The data receiving part is composed of wireless receiving circuit, microprocessor and display part.

Receive data from radio under the control of a microprocessor. After receiving a set of format data, the decoder in the receiving circuit decodes the format data. The current pressure information of the environment is obtained. Then the pressure information is displayed on the LED receiving panel.

Extended Reading: How does a MEMS pressure sensor work?

Pressure transducers for sale

Hygienic / Sanitary Pressure Transmitter
Also called Hygienic pressure Transmitters, or tri clamp pressure transmitter. Sanitary pressure Transmitters is used to food &beverage or pharmaceutical application.
High-Temperature Pressure Transmitter
High-temperature pressure transmitters with a 4-20mA output.
which has a temperature capability of over 850 °C and is not pyroelectric.
Absolute Pressure Transmitter
Absolute pressure transmitter with 4-20mA output for measuring pressure with absolute type reference. Absolute pressure (AP) transmitter is a measure of the ideal (complete) vacuum pressure.
Hydrostatic pressure transmitter
Hydrostatic pressure transmitter is used for fluid hydrostatic pressure measurement. With working static pressure up to 32Mpa, for liquid, gas or steam .
SI-520 Digital Pressure Sensor
Digital Pressure Sensor is particularly suitable for use in computer control systems. RS485 half-duplex working mode.
SI-302 OEM pressure sensor
OEM pressure sensors from Chinese manufacturer. Silicone filled. Protected by stainless steel diaphragm. Suitable for a variety of fluid media.
SI-703 Flush diaphragm pressure sensor
Flush membrane / diaphragm structure, anti-blocking design. Pressure measurement of viscous media.
SI-10 Liquid pressure sensor
Liquid pressure sensor is widely used for pressure measurement of various liquids. Like water or oils. IP68 waterproof.
SI-512H High Temperature Pressure Sensor
High Temperature Pressure Sensor for pressure measurement of high temperature gas or liquid. Such as steam pressure. High temperature up to 800 ℃.
SIJC-1000HSM-Silicon Pressure Sensor
Silicon pressure sensor, also known as Diffused silicon pressure sensor. Silicon pressure sensors are low cost.
SI-706 Combined Pressure and Temperature Sensor-Dual function
Combined pressure and temperature sensor for Simultaneous measurement of pressure and temperature.
Thermocouple types: J, K, E type or PT100 platinum resistance. Two outputs do not affect each other. 
SI-338 Ceramic Pressure Sensor
Ceramic pressure sensor is a pressure sensor refined from a thick ceramic base using a refined ceramic base. Cost-effective. Support OEM processing. 0-0.2MPa -…- 40MPa

More Applications and Markets of Wireless Pressure Sensors

What is Static Water Pressure?

What Is Static Water Pressure? Definition of Static Water Pressure: Static Water Pressure refers to the pressure on water when…

Water Pressure Transducers

Water pressure transducers also called a water pressure sensor, are pressure transmitters that can measure water pipe pressure. For the…

Wireless pressure sensor manufacturer

In conclusion, wireless pressure sensors have revolutionized the way industries monitor pressure measurement. The wireless battery powered pressure monitoring system has eliminated wiring costs, improved safety, and reduced maintenance costs.

Our wireless pressure transmitters offer additional features and benefits when compared to traditional pressure transmitters. If you’re interested in learning more about our wireless pressure transmitters, contact us today.

Sino-Inst, as the manufacturer of wireless pressure sensors, offer you with the best price.

Sino-Inst offers 10 wireless pressure sensors products. These are wireless pressure sensors, wireless differential pressure transmitter, and wireless temperature transmitter.

A wide variety of wireless pressure sensors options are available to you, such as free samples, paid samples. Sino-Inst is wireless pressure transmitter manufacturer, located in China.

Wireless pressure sensor products are most popular in North America, Domestic Market, and South America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and ISO14001 certification.

Request a Quote

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MEMS Pressure Sensors

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MEMS pressure sensors are pressure sensors manufactured using MEMS technology. MEMS pressure sensors include silicon piezoresistive pressure sensors and silicon capacitive pressure sensors.

MEMS pressure sensors are the earliest developed miniature sensors with a large market share. MEMS pressure sensors can be divided into piezoresistive and capacitive types. Both are micromechanical electronic sensors generated on silicon chips. MEMS pressure sensors can use high-precision, low-cost mass production with integrated circuit-like design techniques and manufacturing processes. This makes pressure control simple, easy to use, and intelligent. Compared with traditional mechanical quantity sensors, the size of MEMS pressure sensors is smaller, and the largest is no more than one centimeter. Compared with traditional “mechanical” manufacturing technology, its cost performance is greatly improved.

Sino-Inst offers a variety of MEMS pressure senors for industrial pressure measurement. If you have any questions, please contact our sales engineers.

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Pressure Sensors
Industrial Pressure Sensor for OEM applications
High Temperature Pressure Sensor
Combined Pressure and Temperature Sensor-Dual function
High Pressure Sensor
Gauge Pressure Transmitter/Transducer
Hydrostatic Pressure Sensor/Transmitter
Piezoresistive Differential Pressure Transmitter
Differential pressure(DP) level transmitter

Features of MEMS Pressure Sensors

  • Single crystal silicon sensor using German MEMS technology
  • Integrated sensor design using patented technology
  • Two-wire system. 4 ~ 20mA analog output. HART® digital communication or four-wire system. RS485 output (MODBUS protocol)

Read more about: What is a pressure sensor and how it works? 

Specifications of MEMS Pressure Sensors

RangeMinimum rangeDPRange and sensor limit (kPa)Minimum rangeGPRange and sensor limit (kPa)Minimum rangeAPRange and sensor limit (kPa)
Code（kPa）Upper range (URL)Lower limit of range (URL)（kPa）Upper range (URL)Lower limit of range (URL)（kPa）Upper range (URL)Lower limit of range (URL)
10.11-1//////
20.25-5//////
30.220-200.220-20///
40.550-500.550-500.5500
52200-2002200-10022000
65500-5005500-100///
7202000-500202000-1002020000
810010000-50010010000-100100100000
9///40040000-100///
Measuring range of MEMS pressure sensor
  1. Sensor type: German MEMS technology single crystal silicon sensor
  2. Range ratio: 100: 01: 00
  3. Accuracy grade: 0.075, 0.1, 0.2
  4. Stability: 36 months error is ± 0.2% of maximum range
  5. Temperature effect:
    1. “0.075 level: zero point or range error is ± 0.15% / 28 ℃ of maximum range
    2. 0.1 level: Zero point or range error is ± 0.2% / 28 ℃ of maximum range
    3. Level 0.2: Zero point or range error is ± 0.25% of maximum range / 28 ℃ “
  6. Output signal: “Two-wire system, 4 ～ 20mA DC, HAR T® protocol digital signal. Or four-wire system, RS485 output (MODBU S protocol)”
  7. Metrology certification: CMC
  8. Explosion-proof certification: “Explosion-proof type: Exd IIC T6 Gb
                 Intrinsically safe type: Exia IIC T6 Ga or Exib IIC T4 Gb “
  9. Protection grade: IP67

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What does MEMS mean?

MEMS is the abbreviation of Micro-Electro-Mechanical Systems. MEMS is the name of the United States. In Japan, it is called micromachine. In Europe, it is called microsystem. MEMS refers to mass production, which integrates micro-mechanisms, micro-sensors, micro-actuators, signal processing and control circuits, and interfaces. , Communication and power supply are equal to a micro device or system. MEMS is developed with the development of 1653 technology for semiconductor integrated circuit micromachining and internal ultra-precision mechanical processing technology. Currently MEMS processing technology is also widely used in microfluidic chips and synthetic biology. Chip integration of the technical process of the actual volume laboratory.

What is a MEMS pressure sensor?

MEMS pressure sensor is a pressure sensor manufactured by MEMS technology.
MEMS pressure sensors are the earliest developed miniature sensors with a large market share. The current application field has been greatly expanded, far beyond the traditional applications in industrial transmitters and other fields. Generally, MEMS pressure sensors are made by bulk silicon processing technology, and some are made by surface silicon processing technology. MEMS pressure sensors can be divided into piezoresistive and capacitive. Similar to other sensors, the MEMS pressure sensor converts the pressure into an electrical signal output during operation.

Extended Reading: Digital Pressure Sensor-RS485

Piezoresistive MEMS pressure sensor

The piezoresistive MEMS pressure sensor uses a high-precision semiconductor resistance strain gauge to form a Wheatstone bridge as a force-electric conversion measurement circuit. It has high measurement accuracy, low power consumption, and extremely low cost.

Capacitive MEMS pressure sensor

Capacitive pressure sensors use MEMS technology to produce a diaphragm grid on the silicon wafer. The upper and lower diaphragms become a group of capacitive pressure sensors. The upper diaphragm is displaced downward by pressure and changes the upper and lower diaphragms. The spacing of the grids also changes the capacitance between the plates, that is, △ pressure = △ capacitance

Read more about: Capacitive pressure transducer

How does a MEMS pressure sensor work?

The MEMS piezoresistive pressure sensor uses a circular stress cup silicon film inner wall fixed around the periphery. MEMS technology is used to directly engrave four high-precision semiconductor strain gauges on the surface with the highest stress. Make up the Wheatstone measuring bridge. As a force-electricity conversion measurement circuit. The physical quantity of pressure is directly converted into electricity. The measurement accuracy can reach 0.01% ～ 0.03% FS.

You may like: How does a pressure transmitter work?

The MEMS capacitive pressure sensor uses MEMS technology to produce a diaphragm grid on the silicon chip. The two upper and lower diaphragms become a group of capacitive pressure sensors. The upper MEMS capacitive pressure sensors use MEMS technology to create a grid-like shape on a silicon wafer. The two upper and lower transverse barriers become a group of capacitive pressure sensors. The upper diaphragm is displaced downward by pressure. Changed the spacing between the upper and lower two horizontal barriers. It also changes the size of the capacitance between the boards.

Video on How MEMS Pressure Sensor Operation:

Video source: https://www.youtube.com/watch?v=juf4d3sgOJw

Applications of MEMS Pressure Sensors

  1. Applied in the automotive industry
    A new application of MEMS pressure sensors in automobiles is the transmission system pressure sensing. It is usually used in automatic devices. But it is also used in new dual clutch transmission systems. German manufacturers have introduced a MEMS solution that uses oil to protect the silicon film so that it can withstand pressures up to 70 bar. Bosch also brought huge changes to MEMS pressure sensors a few years ago. At that time, porous silicon was used to bring highly reliable MEMS devices. These devices have been used in current side airbag applications.
  2. Applied to the medical market
    The pressure sensor mainly serves as a disposable low-cost catheter for surgical operations. But they are also used in expensive equipment. Sensing pressure and differential flow in continuous positive airway pressure (CPAC) machines.
  3. Applied in the industrial field
    The main applications of MEMS pressure sensors include heating, ventilation and air conditioning (HVAC), water level measurement, and various industrial process and control applications. For example, in addition to accurate altitude and barometric pressure measurements, aircraft use sensors to monitor engines, flaps, and other components.

Extended reading: What is a pressure sensor?

Frequently
Asked
Questions

Help Center

Depending on the type of pressure to be measured:
Pressure transmitter types include gauge pressure, absolute pressure, and differential pressure. Gauge pressure refers to the pressure that is less than or greater than atmospheric pressure based on the atmosphere. Absolute pressure refers to the absolute zero pressure as the reference and is higher than the absolute pressure. Differential pressure refers to the difference between two pressures.
According to the working principle of the pressure transmitter:
Strain Gauge Pressure Transducers
Capacitance Pressure Transducers
Potentiometric Pressure Transducers
Resonant Wire Pressure Transducers

First of all, the parameters that must be seen when purchasing a pressure transmitter are:
Pressure range. Range. Measurement medium. Installation method-threaded flange clamps, etc. Installation dimensions. Temperature. Whether with display. Whether with HART protocol. Output type. Current output or voltage output. Explosion-proof level, protection level. Accessories. Mounting bracket.
The above parameters will affect the price of the pressure transmitter.
Sino-Inst, as the manufacturer of pressure transmitter, offer you with the best price.

At present, there are mainly two types of MEMS pressure sensors: silicon piezoresistive pressure sensors and silicon capacitive pressure sensors. Both of these are micro-mechanical electronic sensors produced on silicon chips.

The first type: silicon piezoresistive pressure sensor

The silicon piezoresistive pressure sensor uses a Wheatstone bridge composed of high-precision semiconductor resistance strain gauges as the measurement circuit for electromechanical conversion. It has the advantages of high measurement accuracy, low power consumption, and low cost. The output of the piezoresistive sensor in the wheatstone bridge is zero. If there is no pressure change, there is almost no power consumption.

The MEMS silicon piezoresistive pressure sensor is the inner wall of a silicon membrane with a circular stress cup fixed around it. Using MEMS technology, four high-precision semiconductor strain gauges are directly engraved on the place with the largest surface stress to form a Wheatstone measurement bridge. As an electromechanical conversion measurement circuit, it directly converts the physical quantity of pressure into electrical energy. Its measurement accuracy can reach 0.01-0.03%FS.

The second type: capacitive pressure sensor

The capacitive pressure sensor uses MEMS technology to make a horizontal grid shape on a silicon wafer. The upper and lower horizontal grids form a set of capacitive pressure sensors. The upper horizontal grid moves downward under pressure to change the distance between the upper and lower horizontal grids and the capacitance between the plates, that is Pressure = Capacitance.

MEMS pressure sensors can adopt the design technology and manufacturing process similar to integrated circuits, so as to carry out high-precision, low-cost mass production, and have a wide range of applications in ventilators, automobiles, earphones, mobile phones and other fields.

More Pressure Measurement Solutions

Flow Pressure Transducers for Fluid Pipelines

Flow Pressure Transducers are measurements of fluid pressure within a pipeline. When fluid flows through a pipe, pressure acts on the pipe wall. The medium in the pipeline can be…

High Accuracy Pressure Transducers

High Accuracy Pressure Transducers are also called high precision pressure transducers or high accuracy pressure sensors. Sino-Inst manufactures various types of High Accuracy Pressure Transducers. From the perspective of accuracy,…

Sino-Inst offers over 20 MEMS Pressure Sensors. About 50% of these are 4-20ma Low-Pressure Transducers, 40% are Differential Pressure Gauge, and 20% are Diaphragm Seal Pressure transmitters, 20% are 4-20ma differential pressure transmitters.

A wide variety of MEMS Pressure Sensors options are available to you, such as free samples, paid samples. Sino-Inst is a globally recognized supplier and manufacturer of Pressure Transducers, located in China.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Request a Quote

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Diaphragm Seal Pressure Transmitters

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Diaphragm Seal Pressure Transmitters work with Diaphragm Seals for those harsh working conditions. The purpose of the diaphragm seal is to isolate the pressure sensor from the process medium.

The diaphragm seal makes measuring pressure safer and more reliable. It is ideal for protecting pressure process transmitters even under harsh working conditions. The diaphragm seal can isolate the pressure sensor from the process medium. No matter absolute pressure or differential pressure measurement. Mounting with capillary and flange, Diaphragm Seal pressure transmitter can measure pressure, liquid level and flow.When the environment is extremely hot or cold, or when the process connection is difficult to connect to the measuring instrument. When the measured medium is corrosive, sticky, sticky or easily cured. Or when the process is not chemically compatible with the instrument material. It is recommended to use a diaphragm seal.

Sino-Inst offers a variety of Diaphragm Seal Pressure Transmitters for industrial pressure measurement. If you have any questions, please contact our sales engineers.

CONTACT US

Featured Diaphragm Seal Pressure Transmitters

Flush diaphragm pressure sensor
Sanitary Pressure Transmitter
Diaphragm Seal Pressure Transmitter
Remote Diaphragm Seal Pressure Transmitter
Flange Mounted Differential Pressure Transmitter
Extended Diaphragm Seal DP Level Transmitter
Remote Seal Differential Pressure Transmitter
Differential pressure(DP) level transmitter

What is a diaphragm seal?

Diaphragm seals, also known as chemical seals or remote seals, are used for pressure measurements when the process medium should not come into contact with the pressurised parts of the measuring instrument.

A diaphragm seal has two primary tasks:

  1. Separation of the measuring instrument from the process medium
  2. Transfer of the pressure to the measuring instrument

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Advantages of diaphragm seals

Diaphragm seals offer the advantage that the “contact surface” between pressure medium and diaphragm is relatively large. Thus ensuring accurate pressure measurement, especially for very low pressures (< 600 mbar). Furthermore, they can be easily dismounted, e.g. for cleaning or calibration purposes.

Rosemount 1199

Rosemount 1199 remote transmission diaphragm system provides the world’s most extensive product variety and specifications to meet the requirements of various measurements and applications.

There are the following types of remote transmission differential pressure / level transmitters:
1) PFW flat type remote transmission device
2) RTW thread installation type remote transmission device
3) EFW inserted barrel remote transmission device
4) RFW flange mounted remote transmission device
5) SCW hygienic remote transmission device

The 1199 remote diaphragm can be assembled to Sino-Inst differential, gauge, and absolute pressure transmitters and liquid level transmitters.

We can learn more about Rosemount 1199 remote diaphragm.

How do diaphragm seals work?

Basically, diaphragm seals are used in all pressure measurement processes to avoid direct contact between the measuring instrument and the medium during this process.

In addition, if the measuring point cannot be installed or read because the measuring point is located in a hard-to-reach location, a diaphragm seal can also be used.

In both cases, the applied pressure is transferred to the measuring instrument through the system fill fluid in the diaphragm seal housing.

The diaphragm of the seal can be made of different materials, such as stainless steel, Hastelloy, Monel or tantalum. In addition, coatings with ECTFE, PFA or gold can also be used.

We can provide the best diaphragm seal design, materials, system fill fluid and accessories for each application. The combined configuration of the pressure measuring instrument and the diaphragm seal is mainly determined by the special application conditions of the diaphragm sealing system.

You may like: How does a pressure transmitter work?

Differential Pressure Transmitter Installation Guide

Diaphragm type pressure transmitter working principle

Diaphragm pressure transmitter is an automated instrument that measures fluid pressure in the industrial field.

  • It is mainly composed of pressure measuring probe, capillary tube, filling liquid and pressure transmission head.
  • One end of the pressure measuring probe is provided with an elastic metal diaphragm
  • When the pressure acts directly on the surface of the measuring diaphragm, the diaphragm will have a slight deformation.
  • The high-precision circuit on the measuring diaphragm transforms this tiny deformation into a highly linear voltage signal proportional to the pressure and also proportional to the excitation voltage.
  • Then use a special chip to convert this voltage signal into an industry standard 4-2OmA current signal or 1-5V voltage signal.
  • Because the measuring diaphragm adopts standard integrated circuit, which contains linear and temperature compensation circuits, it can achieve high precision and high stability.
  • The transmission circuit adopts a special two-wire system chip, which can ensure the output of a two-wire 4-20mA current signal, which is convenient for field wiring.

Read more about: What is industrial pressure transmitter?

When to use diaphragm seal ?

The diaphragm seal pressure transmitter is suitable for the following working conditions:

  1. The high temperature medium needs to be isolated from the transmitter.
  2. The measuring medium has a corrosive effect on the sensitive components of the transmitter.
  3. Suspended liquid or high viscosity medium.
  4. The measured medium solidifies or crystallizes due to changes in the environment or process temperature.
  5. Replacing the measured medium requires strict purification of the measuring head.
  6. The measuring head must be kept clean and hygienic.
  7. Liquid level measurement of sealed pressure vessel.

Difference between bourdon tube and diaphragm pressure gauge:

SI-D100 Diaphragm Pressure Gauge

Frequently
Asked
Questions

Help Center

The remote seal is used to prevent the medium in the pipeline from directly entering the pressure sensor assembly in the pressure transmitter. It is connected to the transmitter by a capillary filled with fluid. As a result, they’re often used in refining, petrochemical, and chemical plants.

Diaphragm pressure gauge consists of a diaphragm isolator and a universal pressure gauge to form a system pressure gauge. The spring tube is evacuated by special equipment. And fill people with irrigation fluid. Seal it with a diaphragm. When the pressure P of the measured medium acts on the diaphragm, it deforms. The working fluid filled in the compression system makes the working fluid form a △ P equivalent to P, with the help of work. The conduction of the liquid causes a corresponding elastic deformation-displacement at the free end of the elastic element (spring tube) in the pressure meter. According to the working principle of the pressure instrument matched with it, the measured pressure value is displayed.

Diaphragm pressure gauges consist of a system of diaphragms and universal pressure gauges. Diaphragm pressure gauges and equipment are mainly connected with threaded connections, flange connections and sanitary clamps. Diaphragm pressure gauges are suitable for measuring the pressure of medium with strong corrosion, high temperature, high viscosity, easy to crystallize, easy to solidify, and solid floats, as well as occasions where the measurement medium must be avoided from entering the general-purpose pressure meter and to prevent the accumulation of sediment and easy to clean.

The characteristics of the filling fluid determine the performance of the sealing system to a large extent, both in response time and temperature to the heat dissipation conditions.
The initial consideration in choosing a sealed diaphragm to fill fluid is the media compatibility of the process.
Glycerin, silicone oil and halogenated carbon are the most commonly used sealed diaphragm filling fluids.
In general there are three ways to fill a diaphragm seal:
1. Filling a diaphragm seal after assembly of the seal to the instrument
2. Filling a diaphragm seal before assembly of the seal to the instrument
3. Filling a diaphragm seal with a capillary between the seal and the instrument

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High Frequency Dynamic Pressure Sensor

Dynamic pressure sensor, the transmitter is a high frequency sensor. Sino-Inst offers a variety of  Dynamic Pressure Sensors for pressure measurement. If you have any questions, please contact our sales…

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Differential pressure transmitter installation guide helps you solve the installation problem of DP Transmitters. Sino-Inst offers a variety of  differential pressure transmitters for pressure/level/flow measurement. If you have any questions,…

Sino-Inst is a manufacturer of Diaphragm Seal Pressure Transmitters.

Sino-Inst offers over 20 Diaphragm Seal Pressure Transmitters at best price. About 50% of these are Pressure level Transducer, 40% are Differential Pressure transmitters, and 40% are Diaphragm Seal Pressure transmitters.
A wide variety of Diaphragm Seal Pressure Transmitters options are available to you, such as free samples, paid samples. 

Sino-Inst is a globally recognized supplier and manufacturer of Diaphragm Seal Pressure Transmitters, located in China. Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Diaphragm Seal Pressure Transmitters products are most popular in Domestic Market, Southeast Asia, and Mid East. 

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

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Hydrostatic Level Measurement

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Hydrostatic level measurement is often used for tank level measurement. Hydrostatic level measurement is one type of continuous level measurement.

What Is Hydrostatic Pressure?

Hydrostatic pressure sensors are used to measure the level or fill height of liquids. Hydrostatic pressure measurement is suitable for liquid level measurement due to the static pressure effect of non-flowing fluids. This physical principle describes the effect of the gravity of a stationary (i.e. non-flowing) liquid on the measurement point. This gravity is often described as “hydrostatic pressure”.

Sino-Inst offers a variety of Hydrostatic level senors for industrial level measurement. If you have any questions, please contact our sales engineers.

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More Pressure Transmitters

Select a Featured hydrostatic level sensor for your application 

SI-151 Hydrostatic Level Sensor
Hydrostatic Level Sensor (Best Price), also called Hydrostatic level transmitter. Continuous level measurement in liquid applications with pressure sensors.
SI-10 Liquid pressure sensor
Liquid pressure sensor is widely used for pressure measurement of various liquids. Like water or oils. IP68 waterproof.
SI-PCM261 Submersible Pressure Transducer
Submersible pressure transducer with 4-20mA output,
is normal submersible pressure transmitter for level measurement.
SMT3151TR Submersible Level Transmitter
Hydrostatic level transmitter is also called hydrostatic level gauge. The rod-type Hydrostatic level transmitter 4-20mADC standard signal output. Flange or threaded installation. Can withstand high temperatures up to 450 ℃.
SI-PCM260 Deep Well Water Level Sensor
Well water level sensor is to apply Hydrostatic Level Sensor to deep well. Well water level sensor submerged in deep well work together with submersible water pump. Range 300m ～ 1000m.
SI-302 Anti-corrosive Submersible Level Transmitter
Submersible Level Transmitter is made of Anti-corrosive all-tetrafluoroethylene(PTFE) material. It has high temperature resistance, corrosion resistance and anti-clogging.
Wireless Level Sensor – LoRa The Wireless Level Sensor upgrades the LoRa wireless transmission function based on the Hydrostatic Level transmitter. Measure water or oil level. 

Pressure Guided Submersible Level Transmitter
Stainless Steel Level Sensor-Pressure Guided Submersible Level Transmitter. The sensor part and the signal processing circuit are inside the junction box. It is used for high temperature, corrosive liquid, sewage, etc. 

The above level sensors are Submersible Level Transmitters. According to your measurement needs, we can provide various customizations. For example: measuring range, installation method, output method, explosion-proof, lightning protection, anti-corrosion, etc.

If you cannot use a level probe, we recommend that you use a pressure level sensor.

Extended reading: sludge level measurement

Hydrostatic level measurement with Pressure Transmitters

Flange Mounted Differential Pressure Transmitter
Extended Diaphragm Seal DP Level Transmitter
Remote Seal Differential Pressure Transmitter
Differential pressure(DP) level transmitter

In open and closed tanks, there may be special conditions such as high temperature and corrosion. At this time, use a pressure or differential pressure transmitter, with flange, diaphragm, capillary, etc. We can achieve the static pressure measurement of the tank liquid level.

Image source: https://new.siemens.com/global/en/products/automation/process-instrumentation/level-measurement/continuous/hydrostatic-level-measurement.html

Pros & Cons of Hydrostatic level measurement system

About Hydrostatic level transmitter advantages and disadvantages, we do a simple analysis here. If you want to know more about the advantages and disadvantages of level transmitters. Please refer to Sino-Inst Level Transmitters.

Advantages

  • High measurement accuracy;
  • The ultra-high range can be customized up to 1000 meters.
  • Easy to install;
  • The signal can be transmitted remotely;
  • The corrosion of various media can be resisted by choosing different materials;
  • Suitable for explosion-proof occasions;
  • Low cost;

Disadvantages

  • The measurement signal needs to be converted;
  • When the measuring range is greater than 5 meters, it is impossible to measure the high temperature medium temperature exceeding 125 ℃;
  • The density of the measuring medium must be uniform.

Hydrostatic level sensor installation guide

  1. If you choose a submersible pressure transmitter. You must lower the device into the medium by cable. Until you reach the bottom of the tank, reservoir or underground resources, or until you reach the required zero level. Then, run the cable from the oil tank or water tank to the control system. Connect the level probe to the PLC accordingly.
  2. If you have turbulent media, you should use an extra tank weight to stabilize the level probe in the media. To obtain a stable pressure reading. To prevent the cable from any mechanical damage. You can use the cable clamp to fix the cable on the top of the water tank. Or when connecting the cable to the control system.
  3. If you choose a standard pressure transmitter. Simply screw the transmitter into the threaded hole on the bottom or side of the tank. Then, connect the transmitter to the PLC with the appropriate cable connector. Or if cable connection is selected, connect the transmitter directly to the control system.

Hydrostatic level sensor can also be used with paperless recorder.

Capacitive vs Hydrostatic level sensor

Capacitive liquid level transmitter is the core sensor working principle of a transmitter. Refers to an instrument that measures differential pressure by detecting changes in capacitance on both sides of the sensing diaphragm. Theoretically, it can measure the pressure and differential pressure in any form, including liquid level. The reason why it is called a liquid level transmitter is only because its installation method is specially designed for liquid level measurement. The essence of the capacitive liquid level transmitter is a differential pressure transmitter.

Hydrostatic level sensor refers to a method of measuring liquid level using the principle of Hydrostatic pressure. Liquid level height × medium weight = pressure difference between liquid level and upside. This method of measurement requires the use of a differential pressure transmitter. If this differential pressure transmitter is designed to be more suitable for liquid level measurement, it is called a liquid level transmitter.

Extended reading: Hydrostatic Pressure Transmitter

Frequently
Asked
Questions

Help Center

A submersible pressure transducer or a flush pressure sensor measures the height-dependent weight-force of the liquid column, also known as hydrostatic pressure.
This pressure measurement is directly proportional to the liquid level respectively liquid column, at the measuring point of the pressure sensor.
It is, therefore, necessary, for the measurement of level, that the pressure sensor is placed as close as possible to the level of the vessel’s bottom.
The measured hydrostatic pressure then directly corresponds to the height of the liquid column, from the ground-level measurement point to the surface-level of the medium.
So, the filling height is calculated from the distance of the medium surface, to the measuring point by the pressure measurement.
The weight force of the liquid column, thus the hydrostatic pressure, however, is not only directly proportional to the filling height but also varies with the specific gravity of the medium and the force of gravity.
Read more about: Differences! Static pressure vs dynamic pressure vs total pressure

Hydrostatic pressure is the pressure that a homogeneous fluid acts on an object.
This is a omnidirectional force that is evenly applied to all parts of the surface of the object. Increased hydrostatic pressure will reduce the volume of the stressed object, but will not change its shape

Hydrostatic level transmitter is actually a type of pressure transmitter. Hydrostatic level transmitter is the application of pressure transmitter to liquid level measurement. The submersible Hydostatic pressure level transmitter is based on the principle that the measured liquid static pressure is proportional to the height of the liquid. Piezoresistive effect using diffused silicon or ceramic sensitive elements. Convert static pressure into electrical signal. After temperature compensation and linear correction. Convert to 4-20mADC standard current signal output. In order to achieve liquid level measurement.

Usually we measure the liquid level by measuring the pressure.
When the liquid level transmitter is put into a certain depth in the measured liquid, the pressure formula of the sensor facing the liquid surface is: Ρ = ρ.g.H + Po. In the formula:
P: the pressure on the liquid face of the transmitter
Ρ: measured liquid density
G: local gravity acceleration
Po: atmospheric pressure on the liquid surface
H: Depth of transmitter into liquid
At the same time, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through the air-conducting stainless steel. Then connect the atmospheric pressure Po on the liquid surface to the negative pressure chamber of the sensor. To offset Po on the back of the sensor, the pressure measured by the sensor is: ρ.g.H. Obviously, by measuring the pressure P, the liquid level depth can be obtained.
Of course, if the liquid level is measured, the pressure value can also be converted.
Read more What is a diaphragm seal?

Yes. If it is an open tank use a transmitter. If it is pressurized, 2 pressure transmitters must be used (the difference in the software is the liquid level height). The range unit of the transmitter is preferably mmH2O.
If the medium is not water, its density must also be known. This allows for span correction (top transmitters do not do span correction). Generally, a double-diaphragm differential pressure transmitter is used to detect the liquid level.

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Hydrostatic level sensor price

Compared with other liquid level transmitters, Hydrostatic level esnsor has lower cost. The price of Hydrostatic level sensor is mainly affected by the measurement situation. Such as:

  1. Range range;
  2. Medium temperature;
  3. The medium is corrosive;

Sino-Inst is a manufacturer of Hydrostatic level sesnor. Sino-Inst provides customers with the best Hydrostatic level measurement price. For example, the general-purpose Hydrostatic level transmitter has a reference price of USD70. If you want to know the exact price, please contact our sales engineer.

Sino-Instrument offers detailed product specifications and data sheets for review. Our application engineers, can help ensure you choose exactly what you need for your specific installation. Or if you need the RFQ instantly, we can offer you with the submersible level transmitter price immediately.

Extended Reading: bin level measuring system

Sino-Inst offers over 50 Hydrostatic level sensors at best price.

About 50% of these are Submersible Pressure Transducer, 40% are Differential Pressure Gauge, and 40% are Diaphragm Seal Pressure transmitters.
A wide variety of  Submersible Pressure Transducer options are available to you, such as free samples, paid samples. 

Sino-Inst is a globally recognized supplier and manufacturer of 
Submersible Pressure Transducer, located in China. Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. Submersible Pressure Transducer products are most popular in Domestic Market, Southeast Asia, and Mid East. 

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

Readd more about: [What is and How it Works]Hydrostatic Level Sensor

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SI-302 Anti-corrosive Submersible Level Transmitter

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Submersible Level Transmitter is made of Anti-corrosive all-tetrafluoroethylene(PTFE) material. It has high temperature resistance, corrosion resistance and anti-clogging.

Submersible level transmitter made of PTFE is perfect in the harshest applications. Like Acid and alkali environment, Sludge and Slurries. Anti-corrosive Submersible Level Transmitter utilizes the linear change law of liquid height, density and pressure. It converts the change of liquid level into linear 4-20mADC standard signal output. Integrate temperature compensation calibration technology. Easy installation. Anti-corrosive Submersible Level Transmitter adopts two-wire system. 4 ～ 20mA output. 24V DC power supply. ATEX, 3 wire, remote mount transmitter optional.

Sino-Inst offers a variety of Submersible level transmitters with 4-20mA for industrial level measurement. If you have any questions, please contact our sales engineers.

CONTACT US
More Hydraostatic Level Sening

Features of SI-302 Anti-corrosive Submersible Level Transmitter

  1. Corrosion resistance, high precision, low cost, high temperature resistance, anti-clogging;
  2. Convenient installation. Directly put the lowest point of the liquid level of the measured medium. Very convenient to use;
  3. Solid structure. No moving parts. High reliability. Long service life;
  4. Widely used to measure the liquid level of any liquid. Except for the medium corrosive to tetrafluoroethylene;
  5. From water, oil, acid, alkali, salt to paste with high viscosity can be measured with high accuracy. It is not affected by the foaming, deposition and electrical characteristics of the measured medium.
  6. With power supply reverse polarity and overload current limit protection.

Specifications of Submersible Level Transmitter

Measuring range:0~200m
Accuracy:0.5
Signal output:4~20ADC, 0~20mA
Loading resistance:0~600Ω
Transmitting distance:>1000m
Working voltage:24VDC
Working temperature:-50~ +80 °C;    -50~ +450 °C; 
Environmental temperature:-40~ +50 °C
Relative humidity:≤85%
Contacting liquid material:Stainless steel, PP, PTFE
Installation type:Flange: DN32 (HG/T20593,20595-97) RF sealing face ；  
G2″ thread（customize）
Electrical connection:M20×1.5
Explosion-proof grade:Exia II CT6Ga;   Exd II CT6Gb

Extended reading: sludge blanket level detector

Applications of Anti-corrosive Submersible Level Transmitter

Anti-corrosive Submersible Level Transmitter liquid contact material uses PTFE. Fully sealed welding of stainless steel shell. If customer needs, can be customized full PTFE material. Industry standard 4 ～ 20mA or 0 ～ 10mA signal output. Basically, no maintenance is required, and the wetted part is made of full PTFE material, which is extremely resistant to corrosion.

Anti-corrosive Submersible Level Transmitter is widely used in harshest applications such as Sludge and Slurries.

Product Applications:
Sulfuric acid, hydrochloric acid, hydrofluoric acid;
Corrosive liquids such as liquid alkali, xylene and acetone;
Wastewater;
Sludge pits, clarifiers, digesters;
Alum tanks;
Chemical storage tanks;
Oil tanks;
Lime slurry;
Sumps;
Reservoirs;

Extended reading: Applications of Radar Corrosive Liquid Chemical Level Sensor

How do Submersible Level Transmitters Work?

The basic working principle of Hydrostatic Level Sensor is static pressure level measurement.

In liquid, the pressure generated at a certain depth is generated by the weight of the medium itself above the measurement point. It is proportional to the density of the medium and the local acceleration of gravity.

The formula P = ρgh reflects the proportional relationship between them.

Where P = pressure, ρ = medium density, g = gravity acceleration, h = depth of measurement point.

Therefore, the physical quantity measured by the input liquid level gauge is actually pressure. It can be understood by the calibration unit mH2O of the input level gauge. The actual liquid level must be obtained by conversion after knowing the two parameters of density and gravity acceleration. In the industrial field, such conversion is usually performed by a secondary instrument or PLC.

The Hydrostatic Level Sensor mainly measures corrosive liquids such as hydrochloric acid, hydrogen peroxide, etc. Or chemical and electroplating wastewater. Mainly used in measuring corrosive media. It has the advantages of strong corrosion resistance and stable performance.

More Submersible Pressure Transmitters for level measurement

Hydrostatic level transmitter-Rod Type
Submersible Pressure Transducer
Hydrostatic Level Sensor
Deep Well Water Level Sensor

Submersible Level Transmitter Calibration

Unscrew the protective cover and you will see the zero and full range resistors. External standard power supply and ammeter (above 0.2 level) can be adjusted. Proceed as follows:

  • When the transmitter has no liquid. Adjust the zero resistor to make the output current 4mA;
  • Transmitter is filled to full scale. Adjust the full range resistor to make it output current 20mA;
  • Repeat the above steps two or three times. Until the signal is normal;
  • The adjustment is completed. Tighten the protective cover.

Submersible Level Transmitter installation and precautions

The transmitter probe has an M20 × 1.5 interface, which can be screwed directly on the wall of the container or pipeline. Can also put the transmitter into the pool or other liquids. Cable lead to display instrument, secondary instrument or control room. Note that the cable part on the ground needs to be protected or elevated. If there is sediment at the bottom of the liquid to be tested. The transmitter should be raised or filtered for protection.

A. Instructions for installation of input liquid level sensor:

  1. Sludge and oil residue are easy to deposit on the bottom of the tank. It is recommended to move the measuring probe at a certain height away from the bottom of the tank (cabin). To avoid debris blocking the probe.
  2. When the medium in the tank fluctuates greatly and the air guide cable is very long. The probe should be fixed with a sleeve. To prevent the probe from swinging and affecting the measurement accuracy.
  3. When the transmitter is installed, the bending radius of the air guide cable should be greater than 10 cm. Avoid excessive bending to damage the air guide cable.
  4. The ground terminal of the input liquid level transmitter should be reliably grounded. The power shield should be connected to it.
  5. The installation direction of the transmitter is vertical. The installation position of the input type (probe) should be far away from the liquid inlet and outlet and the agitator.
  6. If the medium in the tank has large vibration, wire should be wrapped around the transmitter (probe). Use steel wire to reduce shock to avoid breaking the cable.

B. How to install the input liquid level sensor (probe) to prevent damage to the diaphragm?

When the Submersible Level Transmitter is installed in a stationary deep well or pool. Usually the steel pipe with inner diameter Φ45mm is fixed in water. Make small holes at different heights on the opposite side of the liquid flow direction, so that the medium can enter the tube smoothly. Then put the input liquid level transmitter into the steel pipe and use it.

Learn More About Submersible Level Transducer.

How to use Submersible Level Transmitter ?

  1. It is best to choose a regulated power supply to supply power separately. The stability of the power supply affects the performance index of the transmitter. It is best to control its error to less than one-fifth of the allowable error of the transmitter. For products with special power supply requirements, special power supplies must be connected.
  2. The signal cable of the liquid level transmitter should adopt shielded cable. Prevent electromagnetic interference.
  3. Connect the transmitter according to the correct wiring method. The power-on time should be between 15 and 30 minutes.
  4. If the liquid level transmitter is installed in the pool, water tower and other occasions. You can sink its probe underwater. Keep away from locations where the water velocity is too fast.
  5. In the installation of liquid level transmitters with large fluctuations such as submersible pumps, it is best to use the method of inserting steel pipes. The steel pipe should be fixed firmly. A hole should be made in the steel tube at every interval. The position of the steel pipe should be far away from the water inlet and outlet.
  6. The junction box should be fixed firmly. Or install a fixed bracket. It must be protected from dry and shaded places and must not be exposed to rain.
  7. Protect the ventilation cable. It must not be bent, blocked or damaged. Extra cables can be coiled nearby.
  8. The liquid level transmitter installed outdoors must also take lightning protection measures.

Submersible Level Transmitter for Wastewater

The wastewater treatment process involves many occasions where the liquid level needs to be measured. Also due to the characteristics of the sewage treatment process itself. Need to choose the appropriate level sensor according to the characteristics of each process and medium.

The sensor must be suitable for measuring sewage. The acid, alkali and small particles in the sewage have no effect on the measurement accuracy and life. The sensor has high measurement accuracy. Easy to install. Easy to adjust. The level gauge display is intuitive and has analog output and alarm output functions.

Generally speaking, magnetic float level sensor, ultrasonic level sensor and Submersible Level Transmitter can be used to measure the sewage level.

  1. The magnetic float level sensor is to convert the displacement of the magnetic float with the change of liquid level into a simulated linear standard signal output. The measurement accuracy can generally reach 1.5. When used for sewage measurement, the oil and suspended particles in the sewage will gradually adhere to the wall of the level gauge pipe. Over time, the amount of floating objects increases and the friction increases. The floating ball cannot rise and fall freely as the liquid level changes. It cannot be measured.
  2. The ultrasonic level sensor is based on the relationship between the distance from the ultrasonic probe to the surface of the measured object and the time. This type of liquid level gauge is almost not limited by the measured medium, but has a blind zone, which is suitable for the level measurement of the large “H” value of the storage silo. For the level measurement of sewage pits, due to the existence of blind areas, it has a greater impact on the accuracy of the measurement.
  3. Submersible Level Transmitter (cable static pressure liquid level transmitter) uses ceramic or diffused silicon sensors. The sensor goes directly into the measured liquid. The static pressure of the liquid medium directly acts on the sensor diaphragm. The static pressure is proportional to the height of the measured liquid. This level transmitter is small. Easy installation and low cost.

Compare the advantages and disadvantages of the above level gauges. Most customers will choose Submersible Level Transmitter.

Extended reading: Sludge flow meter for sewage treatment return activated sludge system

FAQ

What is hydrostatic level sensor?

Hydrostatic pressure level sensor (Submersible Level Transmitter) is a pressure sensor that measures liquid level based on the principle of static pressure measurement. It can also be called “static pressure liquid level gauge, liquid level transmitter, liquid level sensor, water level sensor”

What is the water level sensor?

The water level sensor is an instrument that can convert the water level parameter of the measured point into the corresponding power signal in real time. It is mainly composed of a fully sealed isolation membrane oil-filled sensor and a built-in high-performance microprocessor.
There are many types of water level sensors. There are three common types of ultrasonic liquid level sensors, servo liquid level sensors and static pressure liquid level sensors. Due to the differences in their working principles and performance, their applications are also different.

What is ultrasonic level sensor?

The ultrasonic level sensor is a non-contact liquid level sensor. Ultrasonic sensors are sensors developed using the characteristics of ultrasound. Ultrasound is a mechanical wave with a vibration frequency higher than that of sound waves, which is generated by the vibration of the transducing wafer under the excitation of voltage. It has high frequency, short wavelength and small diffraction phenomenon. In particular, it has good directivity, and can be ray and directional propagation. Ultrasound has a great ability to penetrate liquids and solids. Especially in the opaque solids of sunlight, it can penetrate a depth of tens of meters.

Sino-Inst offers over 10 Submersible Level Transmitters. About 50% of these are Submersible Level Sensors, 40% are water level meters, and 40% are liquid treatment.
A wide variety of Submersible Level Transmitter options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Submersible Level Transmitter, located in China.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.
Submersible Level Transmitter products are most popular in Domestic Market, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers with ISO9001,ISO14001 certification.

Request a Quote

Please enable JavaScript in your browser to submit the form

Magnetostrictive Level Sensor in Storage Tank Level Measurement

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Tank Level Measurement is important for industry storage tank. For example, level measurement of fuel oil tanks and the interface measurement of chemical storage tanks. The liquid level sensor is a kind of level instrument. Hydrostatic, Ultrasonic, Magnetostrictive, Radar, Differential Pressure are commonly choices for tank level measurement. Here, we mainly analyze the magnetostrictive liquid level sensor in the tank applications.

Liquefied petroleum gas is one of the most widely used fuels in civil and industrial production. During the storage and transportation of liquefied petroleum gas, liquid level measurement is an important task of the project. It is required not only to have high accuracy for liquid level measurement. It must also be able to adapt well to the working conditions of closed pressure vessels. At the same time, in order to meet the needs of remote monitoring and management. It must also require the measurement data to have the function of long-distance transmission.

Featured Level Sensors for Tank Level Measurement

Rigid Probe Magnetostrictive Level Transmitter
Integral flange Magnetostrictive level sensor
Digital Display Magnetostrictive liquid level sensor

Comparison of the common detection methods for the Tank Level Measurement

Instrument nameAccuracyMeasuring principleLiquid level, interface, temperature measurementRegular maintenanceOn-site installationoverall costsService life
Magnetostrictive liquid level sensor0.5mmMagnetostrictionYes (integrated)Maintenance-freeSimpleLow20 years
Servo level sensor1mm
mechanical
Yes (split)
Regular maintenance
Complicated
High
short
Guided wave radar level senosr 1mm
RadarnoMaintenanceComplicatedHighLonger

Liquid level measurement methods for Tanks

There are 7 main types of level transmitters that Sino-Inst offers for Tank Level Measurement. Each type of transmitter works in a different way, and makes it useful for different types of processes.

Extended reading: Industrial Tank level indicators and Tank Level Gauges

Analysis and comparison with other level sensors

(1) Optical fiber level gauge
Based on optical technology. Use optical fiber as the sensor unit. Take out the sensitive state as an optical signal. Then photoelectric conversion. So it is easy to match with highly developed electronic control devices.

Compared with other conventional sensors, optical fiber sensors have high sensitivity, fast response speed, and strong resistance to electromagnetic interference. Corrosion resistance, good electrical insulation, small size and easy to form a remote monitoring network with optical fiber transmission system. Especially in the harsh environment of flammable and explosive, it is widely used.

(2) Differential pressure level gauge.Differential pressure level gauges use the principle of liquid pressure. At the bottom of the liquid, check the pressure difference between the liquid pressure and the standard atmospheric pressure. It deforms the semiconductor diffusion silicon film through the pressure of the liquid bottom.

Cause the bridge to be unbalanced. The circuit outputs a voltage corresponding to the liquid level height. In order to obtain the liquid level signal. It has the characteristics of high precision (0.7%), small drift and strong anti-overload capability.

But when the density of the medium changes with the temperature, pressure and composition of the medium, the differential pressure level gauge will produce a false level.

Extended reading: Hydrostatic Level Measurement

(3) Servo level gauge.
The servo liquid level gauge controls the float to follow the liquid level or interface changes through the servo motor. The servo float level gauge is subjected to different buoyancy forces on the liquid surface, in the liquid and on the interface through the float.

The gravity sensor is used to measure the weight of the float. It can send out long-distance signals at the same time. Use microcomputer for remote control. Its dynamic tracking error can reach 0.1mm.

At the same time, it can also compensate for the additional weight error caused by the low liquid level. The measurement accuracy of the liquid level can reach 0.7mm. The sensitivity can reach 0.1mm.

In addition, it also has self-diagnosis and communication functions. The level gauge has high reliability. But the price is relatively high.

(4) Radar level gaugeThe use of radar waves to measure the liquid level is a technology that has been paid close attention at home and abroad in recent years. It uses a horn-shaped waveguide to emit low-power microwaves (tens of microwatts).

Extended reading: Radar Oil Tank Level Sensor

After encountering the tested interface, part of the microwave is reflected back. Received by the transmitter and receiver combination level gauge system. Indirectly measure the liquid level by measuring the time difference between transmission and reception.

The biggest feature of the radar level gauge is that it is suitable for the environment where the application effect of the ultrasonic level gauge is not ideal.

Its maximum range can reach 35m, and the measurement accuracy can reach millimeter level. But its disadvantage is that the price is too high. Can not withstand high temperature and high pressure.

Read more about: 7 Level Senors for Tank Level Measurement

We can learn more about Fluid Level Measurement Techniques: https://www.azosensors.com/article.aspx?ArticleID=1097

Advantages of stainless steel magnetostrictive level sensor for oil Tank Level Measurement:

  1. High precision: the magnetostrictive liquid level gauge uses waveguide pulse to work. During the work, the measured displacement is determined by measuring the time of the start pulse and the end pulse. Therefore, its measurement accuracy is high. The resolution is better than 0.01% FS. This is an accuracy that is difficult to achieve with other sensors.
  2. Good safety: the magnetostrictive liquid level gauge has high explosion-proof performance. Safer to use. Especially suitable for the measurement of chemical raw materials and flammable liquids. It is not necessary to open the tank lid during measurement. There is no insecurity for manual measurement.
  3. Strong reliability: Because the magnetostrictive liquid level gauge uses the waveguide principle. There are no mechanically movable parts. So there is no friction and no wear. The entire converter is enclosed in a stainless steel tube and does not contact the measuring medium. The sensor works more reliably and has a longer life.
  4. Facilitate system automation: The secondary instrument of the magnetostrictive liquid level gauge adopts standard output signal. Help the computer to process the signal. It is easy to work on the Internet. Improve the automation of the entire measurement system.
  5. Simple installation and maintenance: the magnetostrictive liquid level gauge is usually installed through the existing nozzle on the tank top. It is especially suitable for the installation of underground storage tanks and already put into operation. And will not affect normal production during the installation process.

Extended reading: Types of Fuel-Diesel Level Sensors

What is tank level measurement

Tank level measurement is a general term for measuring the static storage of liquid products in large storage tanks. It can be used for inventory measurement, which is to determine the total amount of products in the storage tank.

It can also be used for transmission and transfer measurement, that is, as a basis for product purchase, sale and tax payment. There are two main methods: volume-based and mass-based measurement.

Tank level measurement devices

ULT-100A Ultrasonic Level Transducer

SMT3151TR Submersible Level Transmitter
SI-80 Radar Level Sensors

RF Capacitance Level Transmitter

Flange Mounted Differential Pressure Transmitter

Extended Diaphragm Seal DP Level Transmitter

Remote Seal Differential Pressure Transmitter

Differential pressure(DP) level transmitter

Extended reading: ultrasonic level sensor for diesel tank

Tank level measurement using pressure

Pressure level sensors can be used to establish levels in rivers, tanks, wells or other liquids. The pressure at the bottom of the liquid-filled container is directly related to the height of the liquid.

The transmitter measures this hydrostatic head and provides a final level. In order to obtain an accurate reading, the measuring device must be located at the lower point where you want to measure; it is usually installed or placed at the bottom of the container.

When measuring the liquid level, the specific gravity must be considered. Consider the following equation:

     H = P / SG or P = SG? H

H-the height of the measured liquid. It is usually measured in inches, centimeters, meters, feet, etc.
P-Hydrostatic head at the bottom of the tank. Usually in inches of water column, feet of water column, horizontal bar, psi, Pascal’s, etc.
SG-the proportion of the medium. The dimensionless number is calculated from: measured medium density ÷ water density at 4 ° C. For example, the density of kerosene is equal to 0.82 g / cm 3. Therefore, the kerosene of SG is 0.82g / cm 3 · 1.00g / cm 3 = 0.82.

Extended reading: Radar Liquid Level Sensor|Corrosive, steam, volatile liquids

Radar tank level measurement

Radar level transmitter, also called Radar level gauge. Non-contact Continuous level measurement in liquids and solids with free space radar sensors. Non-contacting radar, based on microwave technology, detects only surfaces that reflect energy.

These transmitters work on the principle of a radar by using radio wave emissions. Mounted at the top of a tank filled with a liquid. The transmitter sends a radar signal into the liquid, and receives a reflection of the signal. The transmitters then analyze the current fill level of the tank based on the time taken by the transmitted signal to return.

Operating Principle of Non-Contacting Radar Level Sensors/Gauges (Unguided Wave)

Radar Level Sensor Features

  • Non-contact, continuous level measurement over larger ranges
  • Unaffected by sludge and biomass, dust, foam, oil, grease and other coatings, uneven surfaces, turbulence, pressure, and vacuum
  • Single frequency radar level sensors for liquid sensing, dual frequency radar level sensors for level measurement of aggregates, gravel, sand, coal, asphalt, and other solids
  • Simple mounting and push-button calibration

More about Radar level measurement

FAQ

How do you measure the depth of water in a tank?

The water level sensor of your water tank is an essential component. If not repaired or replaced, a sensor can become damaged over time and fail entirely. Too much water can cause a malfunction and too little water means inadequate water pressure. Either way, repairing or replacing holding tanks is an expensive task you shouldn’t have to undertake because of sub-par sensors.
With Sino-Inst’s water tank level sensors, there’s nothing to break down or rust and our models have a 99% success rate!
In the high unlikely event that you experience any issues with your product, call us and we’ll replace or repair it immediately at no charge.

How do I test my water level?

Water pressure transducers also called a water pressure sensor,
are pressure transmitters that can measure water pipe pressure.
For the water level/water depth measurement,
in the tank, or in the well, we can use electrical transmitters,
stainless steel body, IP65-IP6, 4-20ma output.

Sino-Instrument offers over 10 level transmitters for tank level measurement. About 50% of these are liquid level meters, 40% is the tank level sensor.

A wide variety of level meters options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of level measurement instrumentation, located in China.

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Remote Seal Differential Pressure Transmitter

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Remote seal differential pressure transmitter is used to prevent medium from entering transmitter. The pressure sensitive diaphragm and the transmitter are connected by a capillary filled with fluid. It is used to measure the level, flow and pressure of fluids, gases or steam.

Remote Seal Differential Pressure Transmitter is often used as a tank level transmitter. The smart pressure transmitter is connected with a stainless steel flange by capillary. The pressure is sensed by a remote transmission device installed on a pipe or container. The pressure is transmitted to the body of the transmitter through the filling silicone oil in the capillary. Then The delta chamber and the amplifying circuit board in the main body of the transmitter convert the pressure or differential pressure to 4 ～ 20mA. The DC signal is output. It can communicate for the setting and monitoring by cooperating with the HART communicator.

Sino-Inst offers a variety of DP pressure transmitters for industrial pressure measurement. Connection with diaphragm seals. If you have any questions, please contact our sales engineers.

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Features of Remote Seal Differential Pressure Transmitter

  1. Simulate the “online operation” assessment one by one. Ensure that the transmitter works stably and reliably under the extreme ambient temperature, medium temperature and working pressure (including positive pressure or vacuum).
  2. Adopt “dynamic profile” remote transmission diaphragm structure. The diaphragm will not be damaged after overload. The accuracy will not change after long-term work.
  3. The filling system with full fusion welding and rigid sealing structure is selected to eliminate the occurrence of oil leakage.
  4. Novelly designed capillary coupling parts. Capillary is reliably protected. It is not easy to break when used on site.
  5. Variety, form and size of remote transmission device. And a variety of filling liquid types. It can meet the measurement needs of various occasions.
  6. Various special products can be provided. Including high temperature, high vacuum, fast response and unequal length capillary (length ≤ 3 meters) remote transmission pressure transmitter

Specifications of Remote Seal Differential Pressure Transmitter

Output signal:4 ～ 20MA. DC two-wire system (analog) superimposes the digital signal on the two-wire 4 ～ 20mA DC signal, and the user selects linear or square root output.
Power supply:12 ～ 45V.DC;
Load characteristics:
Power supply impact: <0.005% output range / V;
Load effect: when the power supply is stable, there is no load effect;
Measurement accuracy: ± 0.1% of the adjustment range, ± 0.2% standard accuracy is ± 0.2%, if other accuracy is selected, please indicate when ordering and selecting;
Range ratio: 10: 1 or 100 to 1;
Resistance: usually adjustable from 0.1 to 16 seconds, when inert liquid is filled or with a remote transmission device, the time constant will increase;
Startup time: <2 seconds, no warm-up is required.

Working environment:
ambient temperature -29 ～ 93 ℃ (analog amplifier);
29 ～ 75 ℃ (digital / smart amplifier);
-29 ～ 65 ℃ (with display meter);
Ambient humidity 0 ～ 95%.
Protection characteristics:protection ability IP65;
Explosion-proof type: Flameproof Ex d II BT4-6;
Intrinsically safe Exia II CT5.
The effect of static pressure: Zero error: ± 0.5% zui large range limit, for 32MPa under pipeline pressure by zero adjustments.
Electromagnetic radiation effect:0.05% large range value, receiving radiation frequency 27 ～ 500MHz, test field strength 3V / m.
Indication table (%):LCD digital display accuracy ± 0.2%.
Vibration effect:± 200% / g when vibrating at 200Hz in any direction.
Installation position: The diaphragm is not installed vertically, and a zero error of less than 0.24KPa may occur, but it can be corrected by zero adjustment.
Weight: 3.9Kg (excluding accessories).

Note:
① The working pressure of the remote pressure transmitter also depends on the specifications of the selected flange.
② The working temperature of the remote transmission device is determined by the type of filling liquid selected.
③ The remote transmission pressure transmitter refers to the output change produced by the temperature of the remote transmission device on one side.
④ The effects of static pressure and temperature are measured during a large range.
⑤ The length of the capillary on the side of the GP remote pressure transmitter is generally 1.5 meters, and the length should not exceed 3 meters (special agreement is agreed).

Read more What is a diaphragm seal?

DP Remote Seal Pressure Transmitter with Diaphragm Seal Installation

Rosemount 1199 remote transmission diaphragm system provides the world’s most extensive product variety and specifications to meet the requirements of various measurements and applications.

There are the following types of remote transmission differential pressure / level transmitters:
1) PFW flat type remote transmission device
2) RTW thread installation type remote transmission device
3) EFW inserted barrel remote transmission device
4) RFW flange mounted remote transmission device
5) SCW hygienic remote transmission device

The 1199 remote diaphragm can be assembled to Sino-Inst differential, gauge and absolute pressure transmitters and liquid level transmitters.

We can learn more about 1199 remote diaphragm.

Read more about: Differential Pressure Transmitter Installation Guide

Applications of Remote Seal Differential Pressure Transmitter

Remote Seal Differential Pressure Transmitter is a pressure sensor assembly used to prevent the medium in the pipeline from directly entering the transmitter. It is connected to the transmitter by a capillary filled with fluid. It is used to measure the liquid level, flow rate and pressure of liquid, gas or steam. Then it is converted into 4 ～ 20mA DC signal output. The applicable media are as follows:

  1. Viscous medium at high temperature;
  2. Easily crystallized medium;
  3. Precipitation medium with solid particles or suspended matter;
  4. Strongly corrosive or highly toxic medium;
  5. It can eliminate the occurrence of leakage of the pressure guiding pipe and pollute the surrounding environment. It can be avoided when using the isolation liquid. Because of the unstable measurement signal.
  6. Continuously and accurately measure the interface and density;
  7. The remote transmission device can avoid the mixing of different instantaneous media. So that the measurement results truly reflect the actual situation of process changes;
  8. Places with high sanitation requirements;
  9. Such as in the production of food, beverage and pharmaceutical industries. Not only does the transmitter contact with the media meet hygienic standards, but it should be easy to rinse to prevent cross-contamination of different batches of media.

Extended reading: SI-703 Flush Diaphragm Pressure Sensor

Precautions for use:

In the use process, we should pay attention to consider the following situations:

  1. When measuring the liquid pressure, the installation location of the remote pressure transmitter should avoid the impact of the liquid (that is, the water hammer phenomenon). In order to prevent the sensor from being damaged by overpressure.
  2. When the remote pressure transmitter transmitter freezes in winter. The transmitter installed outdoors must take anti-freezing measures. Avoid expansion of liquid in the pressure port due to icing volume. Lead to sensor damage.
  3. When wiring, pass the cable through the waterproof connector (accessory) or the flexible tube and tighten the sealing nut. In order to prevent rainwater etc. from leaking into the transmitter housing through the cable.
  4. When the remote pressure transmitter is used to measure the liquid pressure. The pressure tap should be opened on the side of the process pipe. In order to avoid sedimentation and accumulation of slag.
  5. To prevent the flange liquid transmitter from contacting with corrosive or overheated media. It is also necessary to prevent scum from depositing in the duct;
  6. When measuring the pressure of the gas, the pressure port should be opened at the top of the process pipeline. And the flange level transmitter should also be installed in the upper part of the process pipeline. In order to quickly deposit the deposited liquid into the process pipeline.
  7. The remote pressure transmitter should pay attention to that the pressure guiding tube of the sensor should be installed in a place with small temperature fluctuation.
  8. When measuring the steam or other high temperature medium of the remote pressure transmitter, it is necessary to connect a condenser such as a buffer tube (coil tube). The operating temperature of the transmitter should not be exceeded.

Extended reading: Smart Differential Pressure Transmitter

Remote Seal Differential Pressure Transmitters Working Principle

What is a diaphragm seal?

Diaphragm seals, also known as chemical seals or remote seals, are used for pressure measurements when the process medium should not come into contact with the pressurised parts of the measuring instrument.

A diaphragm seal has two primary tasks:

  1. Separation of the measuring instrument from the process medium
  2. Transfer of the pressure to the measuring instrument

You may like: Diaphragm pressure gauge

What is remote seal?

The remote seal is used to prevent the medium in the pipeline from directly entering the pressure sensor assembly in the pressure transmitter. It is connected to the transmitter by a capillary filled with fluid. As a result, they’re often used in refining, petrochemical, and chemical plants.

What are the advantages of diaphragm seals?

Diaphragm seals offer the advantage that the “contact surface” between pressure medium and diaphragm is relatively large. Thus ensuring accurate pressure measurement, especially for very low pressures (< 600 mbar). Furthermore, they can be easily dismounted, e.g. for cleaning or calibration purposes.

How do diaphragm seals work?

Basically, diaphragm seals are used in all pressure measurement processes to avoid direct contact between the measuring instrument and the medium during this process.

In addition, if the measuring point cannot be installed or read because the measuring point is located in a hard-to-reach location, a diaphragm seal can also be used.

In both cases, the applied pressure is transferred to the measuring instrument through the system fill fluid in the diaphragm seal housing.

The diaphragm of the seal can be made of different materials, such as stainless steel, Hastelloy, Monel or tantalum. In addition, coatings with ECTFE, PFA or gold can also be used.

We can provide the best diaphragm seal design, materials, system fill fluid and accessories for each application. The combined configuration of the pressure measuring instrument and the diaphragm seal is mainly determined by the special application conditions of the diaphragm sealing system.

Diaphragm type level transmitter working principle

Smart differential pressure transmitters are often used to measure liquid level, flow rate, etc. Differential pressure transmitter cooperates with sealing diaphragm, capillary, etc.

The differential pressure type liquid level gauge uses the principle that when the liquid level in the container changes, the static pressure generated by the liquid column also changes accordingly, as shown in the figure.

For closed tanks. Set the bottom pressure to P. If the pressure on the liquid surface is P3 and the liquid level height is H, then:
P = P3 + Hpg (3-11)
In the formula: p is the medium density; g is the acceleration of gravity.
From the formula ((3-1 “available:
△ P = P-P3 = Hpg (3-12)
Usually the density of the measured medium is known, the pressure difference △ P is proportional to the liquid level height H. The pressure difference on the side will know the measured liquid level height.

When the container under test is open, the gas pressure is atmospheric pressure. The negative pressure chamber of the differential pressure gauge can be vented to the atmosphere. It is known that the pressure gauge can also be used to measure the liquid level at this time.

If the container is closed, you need to connect the negative pressure chamber of the differential pressure gauge to the gas phase of the container.

Pressure level transmitter is good for level measurement. Most of the time, we use submersible hydrostatic level sensor for the level measurement. When you can not use the probe of hydrostatic level sensor, you can try with this pressure level transmitter. Pressure level transmitter, is one type of DP level measure instrument, with the diaphragm.

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SMT3151LT Differential pressure (DP) level transmitter a new type of differential pressure (DP) transmitter produced by advanced technology and equipment. Continuous level, flow and differential pressure measurement. Liquid level measurement, is the most common measurement process in continuous production processes, such as: petroleum and chemical industry. The liquid level measuring instrument currently widely used, is the differential pressure level transmitter.

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In the case of open tanks or underground water wells, Hydrostatic pressure level transmitters are also suitable.

SI-151 Hydrostatic Level Sensor
SMT3151TR Hydrostatic level transmitter-Rod Type
SI-PCM260 Deep Well Water Level Sensor

FAQ

What is remote seal pressure transmitter?

Remote Diaphragm seal pressure transmitter with capillary is used as a level transmitter. Diaphragm Seals also called chemical seals, are used in applications where pressure sensor requires isolation from the process media. These applications are corrosive, high temperature, clogged. Or must sanitary fluids to remain in the pipeline or container. The pressure of the liquid in the process does not affect the pressure sensor. Instead, it is applied to the remote seal. And through the capillary, hydraulic pressure is transmitted to the pressure sensor. Installing and filling the diaphragm seal, the impact on instrument performance will be minimized. More

What is remote seal for level transmitter?

Remote seals are commonly used to protect pressure-measuring instruments including pressure gauges, pressure transmitters, and switches from hot, viscous, contaminated, or corrosive media. As a result, they’re often used in refining, petrochemical, and chemical plants. More Remote Diaphragm Seal System Pressure Transmitters

What is differential pressure transmitter working principle?

The basic principle of a differential pressure transmitter is to divide a space into two chambers with sensitive elements. When introducing pressure into the two chambers respectively. The sensor produces displacement (or displacement trend) under the combined action of the two pressures. This displacement is proportional to the pressure difference (differential pressure) between the two chambers. Convert this displacement into a standard signal output that can reflect the magnitude of the differential pressure.
A differential pressure transmitter is a transmitter that measures the pressure difference between the two ends of the transmitter. Output standard signals (such as 4 ~ 20mA, 0 ~ 5V). Differential pressure transmitters are different from general pressure transmitters in that they have two pressure interfaces. Differential pressure transmitters are generally divided into positive pressure end and negative pressure end. In general, the pressure at the positive pressure end of the differential pressure transmitter should be greater than the pressure in the negative pressure section to measure.
Extended Reading: Liquid pressure sensor

What is diaphragm seal pressure transmitter?

Diaphragm seal pressure transmitter with flange direct mount is good for level measurement. Diaphragm seals, also known as chemical seals or flush seals. Diaphragm seals work with pressure transmitter, pressure gauges. To prevent process medium from entering into the pressure-sensing assembly. So, Diaphragm seal systems protect pressure transmitters from hot, viscous, contaminated or corrosive media. Diaphragm seal connection can work with the capillary, flange and manufold. Like remote seal pressure transmitter, DP level transmitter. More

Extended Diaphragm Seal DP Level Transmitter
Extended Diaphragm Seal DP Transmitter is a level transmitter direct mounted on pipe or tank. The isolation diaphragm is in direct contact with the liquid medium.
Flange Mounted Differential Pressure Transmitter
Flange Mounted Differential Pressure Transmitter is also called single flange DP level transmitter. For liquid, gas or vapor pressure measurement.
Diaphragm Seal Pressure Transmitter
When the process medium should not come into contact with the pressured parts of the measuring instrument. Diaphragm sealed pressure transmitters are used for pressure measurement.
Remote Diaphragm Seal Pressure Transmitter
Remote seal pressure transmitter, with capillary and diaphragm seal, remote mount. Diaphragm seal systems protect pressure transmitters from hot, viscous, contaminated or corrosive media.



Extended Reading: Differential Pressure (DP) Flow Meters Technology

Sino-Instrument offers Remote Seal Differential Pressure Transmitters. A wide variety of Remote Seal Differential Pressure Transmitter options are available to you. Such as free samples, paid samples. Sino-Instrument is a globally recognized manufacturer of Pressure sensors, located in China. Sino-Instrument sells through a mature distribution network that reaches all 30 countries worldwide. Remote Seal Differential Pressure Transmitter products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

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