Category Archives: Level Transmitters

Level Transmitters are sensors with an electrical transmission output,

or remote sign of liquid, powder or bulk level.

Capacitive, float, mechanical, submersible,
and ultrasonic models are the different types available of level transmitters.
Sino-Instrument offers over 50 level transmitters for level measurement.
About 50% of these are differential pressure level transmitters,
40% is the liquid level sensor,
and 20% are Ultrasonic Level Transmitter and radar level transmitter.
A wide variety of level transmitters 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.
The top supplying country is China (Mainland),
which supply 100% of the level transmitters respectively.
Sino-Instrument sells through a mature distribution network,
that reaches all 50 states and 30 countries worldwide.
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.

If you want to know What is the level transmitter working principle?

You should know:

What are the different types of level transmitters?

There are many different kinds of level measurement transmitters, including:

  • Capacitance
  • Hydrostatic
  • Magnetic
  • Radar
  • Ultrasonic
  • Guided Microwave

Each of these transmitters works in different ways, making them useful for different types of processes.

  • Capacitance Level Transmitters:
These transmitters use liquid stored in a tank or container,
as a dielectric medium between two or more electrodes.
The energy capacity of the capacitor circuit increases,
when there is more liquid and decreases if there is less liquid. By measuring the variations in the capacitance value,
capacitance level transmitters can calculate the current fill level of the tank or container.

Capacitance Level Transmitters:

  • Hydrostatic Level Transmitters::
Also known as pressure level transmitters,
these transmitters help in determining fluid contents of a container,
by measuring the pressure of the resting body of the fluid within it. The greater the force of liquid, the greater the volume of fluid.
  • Magnetic Level Transmitters:
These transmitters use a magnetic object,
which is suspended in a buoyant float.
This is usually in a narrow auxiliary column,
to restrict lateral movements of the float.
While the float is on top of the liquid,
the movement of the float is measured by a different magnetic device.
This allows a precise and stable fill level to be transmitted.
This method is suitable for continuous measurement,
owing to the tendency of the float to rise or sink based on the liquid level.
  • Radar Fill Level Transmitters:
These transmitters work on the principle of radar by using radio wave emissions.
These transmitters are normally 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.
  • Ultrasonic Level Transmitters:
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.
  • Guided Microwave Level Transmitters:
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.
The electronics integrated into the transmitter housing
determine the filling level based on the time,
taken by the signal to travel down the sensor and back up again.
These types of level transmitters are used in industrial applications,
in all areas of process technology.
Choose the right level transmitter for your application:

SI-PCM260 Deep Well Water Level Sensor

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Deep 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 within 300m ～ 1000m.

SI-PCM260 Deep Well Water Level Sensor

Deep Wells Water level sensor is based on the principle that the measured liquid pressure is proportional to the height of the liquid. The piezoresistive effect of the advanced foreign isolated silicon diffused sensor is used. Change to electrical signal. After temperature compensation and linear correction, convert to 4-20mA standard electrical signal. Well water level sensor submerged in deep well work together with water pump. It is extremely difficult to replace and submit an inspection. Therefore, it adopts stainless steel cable, waterproof, sealing ring, and other four-level seals. Special cables and special water sealing technology make the transmitter highly reliable and stable.

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

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More Hydrostatic Level Measurement

Features of Deep Well Water Level Sensor:

  • Suitable for deep well / groundwater level monitoring. Large measuring range: up to 500-1000 meters.
  • Military factory grade steel cable. Cable diameter φ10mm.
  • Three European waterproof technology. 50MPa high pressure waterproof test.
  • Triple lightning protection. Core lightning protection motherboard.
  • Easy to install. Just connect two wires.

Specifications of Deep Well Water Level Sensor

RangeVarious ranges within 300m ～ 1000m
Medium temperature－20 ℃ ～ 70 ℃
Ambient temperature－10 ℃ ～ 60 ℃
Supply voltageDC 24V (12V ～ 32V)
Load characteristicsCurrent output type≤500Ω; Voltage output type: ≥3KΩ
Insulation resistance＞ 100MΩ
level of accuracyClass A: 0.2 Class B: 0.5 Class
Non-linear± 0.2% F.S
Hysteresis and reproducibility± 0.1% F.S
Long-term stability± 0.1% F.S / y
Thermal zero drift± 0.03 ％ F.S / ℃
Response time≤50ms
Maximum working pressure2 times the range
Electrical connectionsStainless steel cable connection
Material of external partsStainless steel / 316 stainless steel
Shell materialStainless steel / 316 stainless steel
Measuring mediumOil, water and other media compatible with 316 stainless steel
Protection levelIP68

Extended Reading: 3 inch (3″) Water Flow Meter

Applications of Deep Well Water Level Sensor

  • Suitable for deep water level measurement of deep wells and groundwater;
  • Pumping stations, reservoirs, water channels and other water supply and sewage projects;
  • The pressure and oil level of the gas field in the oil field;
  • Ships and marine equipment;
  • Groundwater resource management;

Extended reading: Capacitive water level sensor

Submersible pressure transmitter for level measurement

By videos below, you can know more about submersible pressure transmitter for level measurement：

Video source: https://www.youtube.com/embed/EMotg3BQjlI?rel=0

How this Water Level Sensor Works

Well Water Level Sensor is one type of Hydrostatic Level Sensor.

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.

Extended Reading: LORA water meter

Deep Well Water Level Sensor Installation:

Well Water Level Sensor and oil pipe (water pipe) go down to install together:

  1. The deep well liquid level transmitter should use the special ferrule fixing cable for the matching oil pipe (water pipe). Prevent crushing and damaging the cable. The sensor part should be installed vertically to prevent the sediment and other impurities from burying or blocking the transmitter probe part.
  2. The three-way outlet part is filled with special sealant pad and sealant. Use a wrench to tighten the compression nut. Prevent air leakage.
  3. The entire signal line leads to the interior of the power distribution cabinet. Prevent rainwater at the terminal from penetrating into the cable to cause damage. The transmitter is used for the installation of hydrology, seismic monitoring wells and reservoir dams.
  4. When the transmitter is used alone for downhole measurement. When the cable length is greater than 100 meters, an additional load-bearing wire rope should be added. Go down with the signal cable together. Protect the signal cable to prevent the signal cable from being damaged due to excessive force.

Extended reading: Magnetic water meter-ultrasonic water meter-mechanical water meter

Well Water Level Sensor calibration method:

Unscrew the protective cover. You can see the zero and full range resistors. External standard power supply and ammeter (above 0.2 pole). To adjust. Proceed as follows:

◆ In the case of no liquid in the transmitter. Adjust the zero resistor. Make it output current 4mA.
◆ Transmitter is filled to full scale. Adjust the full-scale resistor. Make the output current 20mA,
◆ Repeat the above steps two or three times. Until the signal is normal.
◆ The adjustment is completed. Tighten the protective cover.

Extended Reading: What is level transmitter working principle?

Precautions for using Well Water Level Sensor:

  1. When the static pressure input type liquid level gauge is installed. The pressure tube must be inserted vertically into the measured medium;
  2. For media with impurities or crystals. The head of the gas collector must be cleaned regularly. To prevent clogging;

Read more about: Why Is The Submersible Level Transducer The First Choice For Water Level Measurement?

FAQ

How do I check the water level in my well?

If it is a deep well, the range is wide. Can only be measured in water. Pressure type liquid level transmitter can be used in the water.
Read more about: Submersible Level Transmitter-Straight Rod Insertion

How does the water level sensor work?

The liquid level sensor mainly has contact type and non-contact type. Different water level sensors have different working principles.
1. The first type is contact. Including single flange static pressure / double flange differential pressure liquid level transmitter, float type liquid level transmitter, magnetic liquid level transmitter, input type liquid level transmitter, electric inner float level transmission Devices, electric float level transmitters, capacitive level transmitters, magnetostrictive level transmitters, service level transmitters, etc.
2. The second type is non-contact. Divided into ultrasonic liquid level transmitter, radar liquid level transmitter, etc.

Extended reading: Radar Water Level Sensor Applications

Deep Wells Water level sensor is designed for deep well level measurement. It effectively solves the problem of deep well liquid level measurement difficulty. Sino-Inst offers over 50 water level sensors. About 50% of these are Submersible level Transmitter, 40% are water meters, and 40% are level meters.
A wide variety of water level sensors options are available to you, such as free samples, paid samples. 
Sino-Inst is a globally recognized supplier and manufacturer of Submersible Pressure Transmitter , located in China. The top supplying country is China (Mainland). You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

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SI3151 Level TRANSMITTERS Direct Mounted Flange Type

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Sino-Instrument > level transmitter > Hydrostatic for Liquids

High-performance level measurement using a differential pressure transmitter.

  1. High-reliability micro-capacitance silicon cell
  2. All welded construction with no flange ‘O’ rings
  3. Exceptional resistance to harsh environments
  4. Electronic linearisation to correct tank shape
  5. Hart® 5.2 multi-drop communication
  6. Versatile indicator with 5-digit display
  7. Field repair possible with common spare parts
  8. The built-in loop calibration facility
  9. Wide range of flange types
  10. Large installed base

Most DP type level transmitters use an ‘O’ ring seal,

which will perish within 6 to 12 months usage in a hostile process environment. 

The FCX series transmitter uses an all-welded construction with fill fluid,

that has been subjected to high vacuum for an extended period to remove entrained air. 

This provides long term reliability not found in any level transmitter of its type.

Each application is different. Please feel free to get in touch to discuss your requirements.

Data sheet:

https://www.drurylandetheatre.com/SI/SMT3151TLT Direct-mounted level (pressure) transmitter.pdf

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Capacitance Level Transmitter

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Continuous level measurement and point level detection in liquids and solids with capacitance probes.

Capacitance level detectorsalso known as Capacitance level transmitter, are also referred to as radio frequency (RF) or admittance level sensors. They operate in the low MHz radio frequency range, measuring admittance of an alternating current (ac) circuit that varies with level. Capacitance level sensors are a proved, as well as a cost-effective solution for level measurement, and point level detection in liquids and bulk solids. Various transmitters for continuous level measurement and switches, for point level detection are available. The measurement of the interface is also possible. The measuring principle is proven in millions of applications.

Sino-Inst offers a variety of  Capacitance Level Transmitters for level measurement. If you have any questions, please contact our sales engineers.

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Capacitive Level Sensing

Features of SI700 RF capacitance level transmitter

  • Capacitive level measurement enables measurement without blind spots over the entire sensor length
  • Fully insulated capacitive sensors also measure aggressive liquids
  • Cost-effective measurement for trouble-free and maintenance-free operation

Capacitance measurement: Measuring Principle

The principle of capacitive level measurement，

is based on the capacitance change of a capacitor.

The probe and the tank wall form a capacitor,

whose capacitance is dependent on the amount of product in the tank:

An empty tank has a lower, a filled tank a higher capacitance.

A simple capacitor consists of two electrode plate,

separated by a small thickness of an insulator,

such as solid,

liquid, gas, or vacuum.

This insulator is also called as dielectric.

Value of C depends on dielectric used,

area of the plate and also distance between the plates.

Where:

C = capacitance in picofarads (pF)

E = a constant known as the absolute permittivity of free space

K = relative dielectric constant of the insulating material

A = effective area of the conductors

d = distance between the conductors

This change in capacitance can be measured using AC bridge.

Benefits RF Capacitance Level Transmitter

Proven and tested measuring principle – robust and safe

Universally adaptable probe

Reliable operation also in strong build-up formation and viscous media

Easy commissioning

Parameters of RF Capacitance Level Transmitter

FEATURES:

  • Liquids and Bulk Solids
  • KSHIELD™ Sensing Probes and Single Setpoint
  • Electronics that Provide Immunity to Buildup
  • Integral and Remote Electronics
  • Easy Set Up Via External Magnet or Pushbuttons
  • Housing with Glass Viewing Cover
  • Wide Variety of Sensing Probes to (450ºF / 800 psig)
  • Single Point Detection
  • Single Touch Initialization
  • Element Sensitivity Down to 0.5 pF

OPTIONS:

  • 316L SS Enclosure
  • External “Alarm” Indicating Lamp
  • Tip Extended Extensions to 60 in / 1524 mm
  • Pipe Extensions to 240 in / 6096 mm
  • Industry Standard Bulk Solids Mounting Plate
  • Process Connections: 3/4” NPT, 1 1/4” NPT, and Custom Flanges

Applications of
Capacitance Level Transmitter

Capacitance Level Probes are used for measuring level of:

  1. Liquids
  2. Powered and granular solids
  3. Liquid metals at very high temperature
  4. Liquefied gases at very low temperature
  5. Corrosive materials like hydrofluoric acid
  6. Very high-pressure industrial processes.

To the high-temperature pressure transmitter.

Sino-Instrument supplies RF Capacitance level transmitters,

is used in bulk solids, such as pellets, granules, powders, slurries,

flow / no flow, conductive products and interface.

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SIRD70 Guided Wave Radar Level Transmitters

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Guided wave radar level transmitter uses guided wave radar (GWR) technology. Based on the reflection of microwave on the surface medium. Through the probe, continuous level measurement of liquid and solid levels is completed.

A guided wave radar level transmitter is also called a wave-guided radar level sensor. They can measure both levels and the interface between two media. Through probe rod or cable, complete level contact types continuous level measurement. Such as Coaxial Probe Guided Wave Radar Level Transmitter. This is different from ultrasonic level measurement, which is non-contact measurement. A guided wave radar level transmitter is often used for tank level measurement. Including liquid and solid. Output 4～20mA/HART, so as to measure and control the level during production.

Sino-Inst offers a variety of Guided wave radar Level Transmitters for industrial level measurement. If you have any questions, please contact our sales engineers.

CONTACT US
More Level Sensors
SIRD-701 Guided Wave Radar Level Sensor
SIRD-702 GWR Corrosive Liquid Chemical Level Sensor

SIRD-703 GWR Bulk Solids & Powder Solid Level Sensor
SIRD-704 Coaxial Probe Guided Wave Radar Level Transmitter
SIRD-705 GWR Level Sensor for High Temperature & High Pressure

We also supply level transmitters, like: Pressure Level Transmitter; Submersible Level Transmitter; and (DP) level transmitter

Features of Guided Wave Radar Level Transmitters

  • Using advanced microprocessors and unique echoDiscovery echo processing technology, the guided wave radar level sensor can be used in a variety of complex conditions.
  • A variety of process connections and types of detection components, guided wave radar level sensor for a variety of complex conditions and applications. Such as high temperature, high pressure, etc.
  • With the pulse working mode, the guided wave radar level meter has very low transmitting power. And can be installed in various metal and non-metal containers without harm to the human body and the environment.

Customer benefits:

  • Microwaves are unaffected by temperature, pressure, specific gravity and vapors
  • Easy to install
  • No moving parts
  • Ignores light continuous coatings
  • Good for vacuum service
  • More direct energy return – more consistent signal
  • Built-in waveform screen (Scope Trace)

Industries served:

  • Oil and gas production
  • Refining
  • Pharmaceutical and biotech
  • Power generation
  • Pulp and paper
  • Iron and steel
  • Chemicals
  • Food and beverage
  • Marine

Parameters of SIRD70 Guided wave radar level transmitters

General Parameters

Probe Material:

  • Rod                                               Stainless Steel 316L/PTFE
  • Cable                                            Stainless Steel 316L/PTFE
  • Coax                                             Stainless Steel 316L/PTFE
  • Seal                                              Viton fluororubber , Kalrez Fluorinated rubber 
  • Process Connection                     Stainless Steel 316L
  • Shell                                             Stainless Steel 316L, Plastic，Aluminum
  • Ground  Terminal                          Stainless Steel 316L

Power: 2-Wire   

  • Standard Version                           (16～26)V DC
  • Intrinsic Safe Version                    (21.6～26.4)V DC
  • Power Consumption                      max. 22.5mA
  • Ripple Allowed
    • – <100Hz                                        Uss < lV
    • – (100～100K)Hz                            Uss < l0mV

Flameproof Type

  • (22.8 ~ 26.4) V DC       2-wire system
  • (198 ~242)V AC   4-wire system / 110V AC    4-wire system
  • Power Consumption                                  max. 1VA，1W

Output                           

  • Output Signal                               (4～20)mA/HART
  • Resolution                                    1.6μA
  • Failure mode                                20.5mA；22mA；3.9mA, hold
  • 2-wire load resistance                  See the diagram below
  • 4-wire load resistance                  Max.500 ohm
  • Integration Time                           ( 0～36)sec, adjustable
SIRD70 guided wave radar level transmitters

Specifications of Guided Wave Radar Level Transmitters

Max Measurement Distance 701         30m/6m（Cable /Rod）
702         20m/6m（Cable /Rod）
703         30m/6m（Cable /Rod）
704           6 m
705         15m/6m（Cable /Rod）
Measurement Interval           About 1sec (Depend on parameter settings)
Adjustment Time                About 1sec (Depend on parameter settings)
Resolution of Display  1mm
Accuracy             ±10mm(See the accuracy illustration diagram below)
Temperature for Storage/Transport               (-40～80) ℃Process Temperature  (Probe)  
701、704       (-40～250)℃
702            (-40～200)℃
703            (-40～130)℃
705            (-200～400)℃
Relative Humidity   ＜95%  
Pressure         Max. 40MPa
Vibration Proof  Mechanical vibration 10m/s² , (10～150)Hz

guided wave radar level transmitter data sheet

Guided Wave Radar Level MeterDownload

Guided wave radar level transmitter range

Explanation：

H— Measuring range

L—Empty distance

B—The top of the blind

E—The minimum distance from the probe to the tank wall

–Blindspot is the minimum distance between the top of the highest material surface materials and the measurement reference point.

–The bottom of the blind refers to a distance near the very bottom of the cable that can not be accurately measured.

–Between the top and bottom of the blind is blind effective measure distances. 

Note:

In order to ensure the accuracy of level measurement, the material should be located between the top and bottom of the blind.

Measuring Range:

The following table lists the relationship between different types of measured media and measurement distance.

Media DK(ε)Solid particlesLiquidMeasuring range
11.4~16–－Condensation gas, such as N2CO23m (only refers to the coaxial rod probe)
21.6~19－Plastic with particles
－White limestone, special cement
-sugar		-Liquefied petroleum gas, such as propane
-Solvent
-Freon 12/ Freon
-Palm oil		25m
31.9~25－Ordinary cement, gypsum－Mineral oil, fuel30m
42.5~4-Cereals, seeds
-stone
-Sand		－Benzene, styrene, toluene
-Furan
-Naphthalene		30m
54~7-Wet stones, ores
-salt		－Chlorobenzene, chloroform
－Cellulose spray
－Isocyanide hydrochloric acid, this amine		30m
6>7-mineral powder
－Carbon black
-coal		-Aqueous liquid
-alcohol
－Liquid ammonia		30m

Extended reading: Radar Level Meter for Corrosive Liquids

What is guided wave radar?

Micropower impulse radar (MIR) combines time domain reflectometry (TDR), equivalent time sampling (ETS), and modern low power circuitry.

This synthesis of technologies creates a high-speed Guided Wave Radar (GWR) transmitter.

The electromagnetic pulses are propagated via a waveguide, that focuses the energy and yields a system, many times more efficient than Non-Contact Radar (Non-contact radar level transmitters).

Time domain reflectometry (TDR)

TDR uses pulses of electromagnetic (EM) energy to measure distances or levels.
When a pulse reaches a dielectric discontinuity (such as one created by a media surface), a portion of the pulse is reflected.
The greater the dielectric difference between air and the process medium being measured, the greater the amplitude of the reflection.

Equivalent time sampling (ETS)

ETS, or Equivalent Time Sampling, is used to measure the high speed, low power EM energy.
ETS is a critical key in the application of TDR to vessel-level measurement technology.
The high-speed EM energy (1000 ft/us) is difficult to measure over short distances, and at the resolution required in the process industry.
ETS captures the EM signals in real time (nanoseconds), and reconstructs them in equivalent time (milliseconds), which is much easier to measure with today’s technology.

Guided-wave radar (GWR) level transmitter working principle

Levelflex works with high-frequency radar pulses, which are emitted and guided along with the probe.

As the pulse meets the medium surface, part of the emitted pulse is reflected due to a change of the dc value (relative dielectric constant).

The Time-of-Flight between pulse launching and receiving is measured, and analyzed by the instrument and constitutes a direct measure for the distance, between the process connection and the product surface.

Install for guided wave radar level transmitter

Waveguides can be metal rigid rods or flexible metal cables. The microwave pulse travels down the outside of the rod or cable. It is reflected on the surface of the material to be tested, and the echo is received by the antenna. The propagation distance can be calculated from the time difference between the launch and echo pulses.

Advantages:

  • Compared with ultrasonic and radar level gauges, the work is stable and reliable;
  • Like radar level gauges, the strength of the reflected signal depends on the dielectric or conductivity of the material being measured. However, the guided wave type can measure materials with lower dielectric constants.
  • It has a strong ability to suppress steam and foam, and the measurement is not affected;
  • Not affected by liquid density, looseness of solid materials, temperature, and dust during feeding;
  • Low maintenance, high performance, high precision, high reliability and long service life.

Disadvantages:

  • Double rods (cables) and coaxial tubular waveguides are easily affected by external structures due to the concentration of electric field energy;
  • It is easy to accumulate material between the rods (or inside the tube), resulting in false echoes and affecting the measurement effect;
  • The cable buried in the material will generate a large pull-down force due to the gravity of the material, causing the cable to be pulled off and other failures.

Extended reading: Features Of Magnetostrictive Level Transmitters

The microwave pulse emitted by the high frequency radar level transmitter is transmitted through the antenna, while the guided wave radar level transmitter is transmitted through the detection component.

So, is the installation standard of the guided wave radar level transmitter the same as that of the high-frequency radar level transmitter?

Today, let’s take a look at the installation standards of guided wave radar level transmitters.

  1. Try to avoid the facilities in the tank during installation, and avoid the detection components (steel cables or steel rods) contacting internal obstacles during the measurement process, which will affect the measurement accuracy.
  2. When installing, try to keep the detection component perpendicular to the surface of the measured medium. In this way, the microwave pulses sent out can reach the designated position, and the later data can be accurate.
  3. During installation, the guided wave radar level transmitter should keep a certain distance from the container wall, and should be kept away from the feed and discharge ports. The feed and discharge ports have a great influence on the accuracy and stability of the guided wave radar level transmitter, so attention must be paid.
  4. If the guided wave radar level transmitter is threaded, its length should not exceed 15mm. Generally, the length of the thread is inversely proportional to the stability of the measurement, that is, the shorter the thread, the more stable the measurement.
  5. During installation, if the cable is too long, we need to cut off the power supply of the guided wave radar level transmitter, remove the cable, and remove the screw on the heavy hammer, and then intercept it from the bottom of the cable.
  6. During installation, if the guided wave radar level transmitter is installed in the still-pipe, pay attention to fix the radar probe with an insulating bracket to ensure that the probe and the still-pipe are concentric, so as to avoid vibration caused by improper installation and affect the accuracy of the measurement.
  7. When installing the guided wave radar level meter, if the connection surface of the container is made of other materials than metal, either use a metal flange to connect, or configure a metal plate.

The above are the main installation standards of the seven-point guided wave radar level transmitter summarized by Sino-Inst. In fact, the standard of guided wave radar level transmitter is far more than that.

When installing, be sure to read the manual of the self-contained product in detail. If you have any questions, you can contact the manufacturer’s engineer.

The relative permittivity of a medium is a physical quantity that characterizes the polarization of the medium.

It is determined by the properties of the medium itself.

Therefore, different media have different relative permittivity.

The dielectric constant of the measured medium directly affects the reflectivity of the high-frequency pulse signal.

When an electromagnetic pulse hits the surface of a medium, the electromagnetic wave is reflected and refracted.

The larger the relative permittivity, the smaller the reflection loss. On the contrary, the smaller the relative permittivity, the greater the transmission loss and the more serious the signal attenuation.

When the conductivity of the measured medium is greater than 10mS/cm, all of them will be reflected back. That is, the stronger the echo signal.

The signal will be extremely attenuated due to too small relative permittivity. Therefore, each guided wave radar level gauge has a minimum relative permittivity to ensure that the radar level gauge can be used normally.

Different companies’ guided wave radar liquid level transmitters have different structural designs and different requirements for minimum relative permittivity.

What is the difference between radar and ultrasonic level transmitter?

Radar liquid level sensors and ultrasonic liquid level sensors are non-contact liquid level measuring instruments. They mainly differ in the following three aspects:

Working principle

  1. Ultrasonic level sensor
    The ultrasonic level sensor uses non-touch measurement method. It is suitable for liquid level measurement in water conservancy and hydrology, chemical petroleum and sewage treatment. The probe of the ultrasonic level sensor is also called a transducer. The transducer emits ultrasonic pulses to the object to be measured. After touching the surface of the medium, the sound wave is reflected by the surface of the medium and is received by the transducer again. The time from when the sound wave is emitted to when it is absorbed and consumed after reflection will be proportional to the distance between the transducer and the medium.
  2. Radar level sensor
    Radar level sensors also use non-touch measurement methods. The measuring principle is similar to that of an ultrasonic level sensor. That is, the antenna emits electromagnetic waves, and the electromagnetic waves are reflected back after reaching the measured liquid surface. Then the antenna receives and recognizes the time distance that Baud has.

Adaptability

The time consumed by the ultrasonic storage and analysis of the sound waves in each period of the ultrasonic level sensor is slightly longer. For this reason, if the rate of liquid level change is too fast, it is generally not recommended to use an ultrasonic level sensor. In addition, the ultrasonic level sensor is sensitive to misty vapor and fine dust within the area. Therefore, ultrasonic level sensors are not suitable for high-pressure and high-temperature environments, misty spaces filled with vapor, or spaces with dust. But on the contrary, the radar level sensor can prevent the disturbance of the above-mentioned environment.

Cost performance

The market price of ultrasonic level sensors produced in China usually ranges from one thousand yuan to several thousand yuan. The appearance of its products is more delicate than that of radar level sensors, so transportation costs will be reduced accordingly. In comparison, the structural design of the radar level sensor is more messy and the measurement steps are more refined, so the price is higher. Especially when the user needs a radar level sensor with HART protocol, the unit price is more expensive. But now the price gap is not big, and it is shrinking year by year.

Through induction and comparison, it is not difficult to find that the ultrasonic level sensor and the radar level sensor have their own advantages and disadvantages. Therefore, it is recommended that users should consider many aspects when purchasing liquid level timing. It is not only necessary to meet the preset specifications, but also to scientifically include the above aspects into consideration.

Extended reading: Ultrasonic Oil Level Sensor-External Paste-Truck Fuel Tank

Maybe you still have questions like:

How to calibrate radar level transmitter?

What’s the guided wave radar level transmitter principle of operation?

You can just contact us for more information about GWR level transmitters.

Our guided wave radar (GWR) level transmitters, are made in China,

With better price, and higher quality.

Frequently
Asked
Questions

Help Center

Guided wave radar devices, also called wave-guided radar level transmitters.
Have no moving parts and require minimum maintenance.
They can measure both levels and the interface between two media.
The guided wave radar level sensor is applied to water storage tanks，
acid and alkali storage tanks, slurry storage tanks,
solid particles, and small oil storage tanks.
All kinds of conductive, non-conductive media, corrosive media.
Such as coal bunkers, ash silos, oil tanks, acid tanks, etc.

Radar level transmitters use radar technology to perform the non-contact continuous level measurement. The radar level indicator converts the level into an electrical signal. The level signal output can then be utilised by other instrumentation to monitor or control. Liquids and solids are commonly measured with this measuring technique. Like: Fly ash silo. Radar level sensors are divided into: Pulsed radar technology and frequency modulated continuous wave (FMCW) radar level sensors.
Extended reading: Radar level sensor for solids – Dust solid level measurement

The main factors affecting the price of guided wave radar level sensors are: Type of medium. Explosion-proof requirements, material and size, temperature, output signal, interface type. Connection method, etc. The reference price is 500-900USD.

Guided wave radar is a measuring instrument based on the principle of time travel. The radar wave travels at the speed of light, and the running time can be converted into a level signal by electronic components.
The instrument measures the distance from the reference point to the material surface. The probe sends out high-frequency pulses and propagates along the cable. When the pulses meet the material surface, they are reflected back and received by the receiver in the instrument. The time signal is converted into a material level signal.

GWR level transmitter is guided wave radar level transmitter. GWR level transmitter is an instrument based on guided wave radar to measure level.

Straighten the wave guide cable, place an internal obstacle with a radius of 30cm, put a vise (simulate the liquid level), and use a steel ruler with high precision to compare the error and calculate the accuracy.

The above method is not very accurate.
If possible, it can be installed on the tank, and the dipstick can be compared.

Related Products

SIRD-901 Radar Corrosive Liquid Chemical Level Sensor
SIRD-902 Drop Antenna Radar Tank Level Sensor
SIRD-902T Microwave Radar Liquid Level Sensor
SIRD-904 Radar Level Gauge with Parabolic Antenna
SIRD-905 Horn Antenna Radar Tank Level Sensor
SI-FMF11 FMCW Radar Level Transmitter 120GHz
SI-FMF13 FMCW Radar Water Level Sensor
SI-FMF12 Frequency Modulated Continuous Wave Radar Level Sensor
SI-151 Hydrostatic Level Sensor
Ultrasonic Level Sensing
Ultrasonic Oil Level Sensor-External Paste-Truck Fuel Tank
Differential pressure(DP) level transmitte

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Sino-Inst offers over 10 GWR Corrosive Liquid Chemical Level Sensors for level measurement. About 50% of these are Guided Radar level meters, 40% is the tank level sensor.

A wide variety of GWR Corrosive Liquid Chemical Level Sensors options are available to you, such as free samples, paid samples.

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

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SIRD-901 Radar Corrosive Liquid Chemical Level Sensor

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Liquid Chemical Level Sensor is suitable for level measurement of corrosive chemicals. Pulse radar non-contact measurement. Antenna made of PTFE.

Liquid Chemical Level Sensor works for level measure and monitor of corrosive liquids for Chemical Processing. The level measurement of corrosive chemicals places extremely high demands on the sensor. Downtime must be avoided. The radar liquid level sensor wrapped in PTFE is corrosion resistant and has a long service life. The sensor has both analog and digital outputs that comply with industry standards. SIRD-901 Radar Corrosive Liquid Chemical Level Sensor is a 26GHz pulse radar level transmitter. The measuring distance can reach 10 meters. The antenna has been further optimized and is suitable for the measurement of various corrosive liquids.

Sino-Inst offers a variety of Radar Corrosive Liquid Chemical Level Sensors for industrial level measurement. If you have any questions, please contact our sales engineers.

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More Radar Level Sensors

Features of SIRD-901 Radar Corrosive Liquid Chemical Level Sensor

The SIRD90 series radar sensor is a 26G Hz radar level measuring instrument, with a maximum distance of up to 80 meters.

  • Non-Contact Measurement
  • Continuous Level Measurement
  • Pulse Radar Measurement Range 0.254 to 15.24m (10″ to 50′)
  • Simple Push-Button Calibration
  • High measurement accuracy
  • Measurement is not affected by temperature, pressure or dust
  • User-friendly adjustment saves time

Parameters of SIRD-901 Radar Corrosive Liquid Chemical Level Sensor

Radar Level Transmitters
Application：All kinds of corrosive liquid
Measuring Range：10 meters
Process Connection：Thread G1½″A / Thread 1½″ NPT /  Flange
Process  Temperature：-40℃~130℃
Process Pressure：-0.1~0.3 MPa
Accuracy：± 5mm
Protection Grade：IP67
Frequency Range：26GHz
Supply：2-wire（DC24V）/ 4-wire（DC24V /AC220V）
Signal Output：4… 20mA /HART （2-wire / 4-wire）RS485/ Modbus
Outer Covering：Aluminum / Plastic / Stainless steel
Explosion-proof Grade：ExiaⅡC T6 Ga/ Exd ⅡC T6 Gb
Antenna MaterialStainless Steel  /  PTFE

Applications of Radar Corrosive Liquid Chemical Level Sensor

Application of radar level transmitter
  • Solid materials;
  • Process vessels or strong dust are easy to crystallize;
  • Condensation occasions
  • Solid Particles
  • Dust
  • Slightly corrosive liquids
  • Various corrosive liquids
  • Hygienic liquid storage containers
  • Strong corrosive containers

Extended reading: Radar Non Contact Water Level Sensor

Corrosive Liquid Chemical Level Sensor in Chemical Processing

Generally, in chemical plants, you will encounter liquid level measurement such as petroleum storage tanks, chemical storage tanks, chemical storage tanks, sewage treatment plants, dosing tanks, seaside, and docks.

Used to measure corrosive media such as sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid, sodium hydroxide, and concentrated alkali.

When encountering these corrosive media, corrosive liquid level sensors are generally used. Use non-contact radar level sensors to measure corrosive liquids such as sulfuric acid, hydrochloric acid, and nitric acid.

Following the introduction of Sino-Inst, we have to consider four major principles when choosing a level gauge to measure.

Extended reading: GWR Corrosive Liquid Chemical Level Sensor

The first principle is to consider the principle of non-contact measurement and choose a non-contact liquid level sensor.

Because the probe of the liquid level sensor does not need to contact the medium. The principle of sensing band is used to obtain the current liquid level information. Such a liquid level sensor, for example, when measuring a level, a radar level gauge does not contact the measured medium, and the material used is tetrafluoroethylene. At the same time, it is a fully enclosed anticorrosive structure. Therefore, the effect is very good for liquid level measurement of viscous, corrosive, turbid and other liquids.

The second principle is to consider the convenience of installation.

Due to the uniqueness of the measurement of corrosive liquids such as sulfuric acid, hydrochloric acid, and nitric acid. It needs simple installation on site. It needs to be simple to open a hole in the tank.

Therefore, in the selection process of the level gauge, it is necessary to consider the characteristics of reliable work, easy installation, long service life, and maintenance-free.

The third principle is sensor selection.

When the radar level gauge measures corrosive media, the general manufacturer will choose the anti-corrosion type tetrafluoro material contact surface. Considering environmental factors, a physically sealed anti-corrosion probe should be selected for this occasion.

The fourth principle is the choice of the host part.

As the host part, good sealing is required. As long as there is a little medium leakage, it is possible to enter the inside of the level gauge from the housing or the wire inlet. As a result, the internal circuit board is corroded.

For corrosive gases in the environment, anticorrosive high frequency radar level gauges can be used to protect the service life of the host.

The above is Sino-Inst analyzes how to choose the level sensor for concentrated sulfuric acid and hydrochloric acid. If concentrated sulfuric acid and hydrochloric acid exceed a certain temperature range, steam or vaporization occurs. It is necessary to consider the actual situation on site and re-select the appropriate level sensor.

Extended reading: FMCW Radar Level Transmitter 120GHz

How does a Radar Corrosive Liquid Chemical Level Sensor work?

In radar level measurement, microwaves are transmitted by the antenna system of the radar sensor, to the measured product, reflected by the product surface, and received back by the antenna system.

The time from emission to reception of the signals is proportional to the level in the vessel. 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.

Liquids and solids are commonly measured with this measuring technique.

Extended Reading: Dielectric constant for radar level transmitter

Featured Level Sensors for Chemical Processing

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ULT-100 Ultrasonic level transmitter

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Ultrasonic Level Transmitter, also called Ultrasonic level sensor, or ultrasonic level Indicator. Ultrasonic Level Transmitter provides reliable, accurate, non-contact measurement of liquid levels. Ultrasonic non-contact technology offers no moving parts to wear, jam, corrode, or get coated like contact technologies. ULT-100 Ultrasonic level transmitter is an explosion-proof product specially suitable for measuring flammable and explosive liquids.

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Learn About: Magnetostrictive level transmitter

Magnetostrictive level sensor

Features of ULT-100 Ultrasonic level transmitter

  1. Provides reliable, accurate, and non-contact level measurement of compatible liquids
  2. Non-contact technology offers no moving parts to wear, jam, corrode or get coated like contact technologies
  3. Mapping software makes effective measuring surface only a 3″ (76.2 mm) diameter column.with no concerns of ladders, pipes, or other tank intrusions in the remaining sound cone
  4. FM approved explosion-proof making it ideal for use in hazardous locations
  5. Easy programming with 6 digit LCD display and simple menu structure
  6. Output range is adjustable with choices of inputting tank dimensions. or by filling and emptying the tank. while calibrating and it automatically and scaling to levels it senses
  7. Window cover allows easy viewing of the display
  8. Fail-safe output options and diagnostic capabilities

Specifications of Ultrasonic Level Transmitter

Wire System Two-wire system
Installation mode Intergrated
Basic parameters Maximum measuring range
(High temperature, fluid) 		30m
Maximum measuring range
(high temperature, moisture) 		20m
Maximum measuring range
(particle > 4mm solid) 		10m
Blind area 0.25-0.5m
measurement accuracy ±0.3%FS(Standard conditions)
Resolution ±1mm
Input Power supply 12~36VDC/85~265VAC
Max electric current >22mA
Ripple requirement less than ±20mA
Output Analog signal 4-20mA
Digital signal RS485, HART 5.0, Modbus RTU
Switch 4 way
Material Transmitter Die Casting Aluminum Alloy
Probe Waterproof ABS/Corrosion Resistant PTFE
Flange Flange standard needs to be provided by customers. Size is related to installation method.
Various kinds of PVC, PP, PTFE, carbon steel and stainless steel flanges can also be customized.
Environment condition Ambient temperature -20°C~60°C. If temperature less than 20°C, LCD display will be limited.
Outdoor instruments should be protected against ultraviolet rays if they are exposed to direct sunlight.
Protection level IP67
Explosion proof level Flamproof type ExdIICT4
Intrinsically safe type ExiaIICT4
Process condition Process temperature -40℃~100℃, High temperature probe is required when exceed 70℃
Process pressure 0.8~3bar or 0.08~0.3MPa, Below 3000m altitude.
Product characteristics Analog and digital output can be shared
High level of protection
Strong anti-interference ability
Comprehensive function
Drawings of ultrasonic level transmitter

Applications of Ultrasonic Level Transmitters

  • Chemical
  • Mining
  • Aggregate
  • Power generation
  • Pulp and paper
  • Iron and steel
  • Wastewater
  • Food and beverage
  • Quarries
Applications of Ultrasonic Level Transmitters

Extended reading: The Secret of Ultrasonic Level Measurement

Extended reading: Guide to Ultrasonic Level Transmitters

Continue reading →

SMT3151LT Pressure Level Transmitter

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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.

The liquid level (pressure/differential pressure) transmitter,

is a pressure signal, measured at the reference side of atmospheric pressure (a low-pressure side),

with one or two ports for flange (or other connection) and process pipe connection.

So, we can say that the SMT3151LT pressure level transmitter,

also is one kind of diaphragm type level transmitter.

A pressure level transmitter is an on-site transmitter, that is mounted directly on a pipe or vessel.

Since the isolating diaphragm is directly in contact with the liquid medium,

it is not necessary to take out the pressure guiding tube on the positive pressure side,

so that the liquid level (Magnetostrictive level gauge), pressure, and density of the medium,

such as high temperature, high viscosity, easy crystallization,

easy precipitation and strong corrosion can be measured,

and then It is converted to 4~20mA.DC signal output

Features of SMT3151LT Pressure level transmitter

  • 0-2.1Mpa
  • -40~204℃
  • Flange-mounted
  • 4-20mA, HART
  • 316 stainless steel
  • Explosion-proof
RFQ NOW

Working Principle of pressure level transmitters:

DP Level Technology

On the basis of common pressure/differential pressure transmitter,

one or two isolation membrane boxes are added to measure the liquid receiving part.

Mainly used for measuring high temperature,

easy to solidify or crystallize,

containing solid suspended matter, too viscous,

corrosive or other needs to maintain sanitary conditions, non-polluting media.

The basic measurement element,

is the same as the technical performance,

and technical index of the 3151 pressure/differential pressure transmitter.

After adding the remote transmission device,

there will be a small decrease in measurement accuracy,

slow reaction speed,

and the installation position should be attended to,

when the pressure is relatively small,

so as to ensure that the measured pressure is within the measurement range,

of the basic measurement element.

In other words, a column of water of a specific height,

will always exert the same amount of pressure on a transducer.

And because weight is a force, and pressure is force applied over an area,

in this case, the area of the transducer,

we can take the pressure reading from the transducer and translate it into a level.

Extended reading: Flat Pressure Sensor for High Viscosity Fluids

What is the working principle of level transmitter?

There are many different kinds of level measurement transmitters, including:

  • Capacitance
  • Hydrostatic
  • Magnetic
  • Radar
  • Ultrasonic
  • Guided Microwave

Each of these transmitters works in different ways, making them useful for different types of processes.

These transmitters use liquid stored in a tank or container,as a dielectric medium between two or more electrodes.The energy capacity of the capacitor circuit increases,when there is more liquid and decreases if there is less liquid. By measuring the variations in the capacitance value,capacitance level transmitters can calculate the current fill level of the tank or container.

Capacitance Level Transmitters:

  • Hydrostatic Level Transmitters::

Also known as pressure level transmitters,these transmitters help in determining fluid contents of a container,by measuring the pressure of the resting body of the fluid within it. The greater the force of liquid, the greater the volume of fluid.

Read more about: Hydrostatic level measurement: Measuring Principle

  • Magnetic Level Transmitters:

These transmitters use a magnetic object,which is suspended in a buoyant float.This is usually in a narrow auxiliary column,to restrict lateral movements of the float.While the float is on top of the liquid,the movement of the float is measured by a different magnetic device.This allows a precise and stable fill level to be transmitted.This method is suitable for continuous measurement,owing to the tendency of the float to rise or sink based on the liquid level.

New: SI-LT Magnetostrictive level transmitter with Local Digital Display

These transmitters work on the principle of radar by using radio wave emissions.These transmitters are normally 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.

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.

  • Guided Microwave Level Transmitters:

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.The electronics integrated into the transmitter housingdetermine the filling level based on the time,taken by the signal to travel down the sensor and back up again.These types of level transmitters are used in industrial applications,in all areas of process technology.

How do you use a DP transmitter for level measurement?

SMT3151LT Differential pressure(DP) level transmitter

How does a hydrostatic level transmitter work?

SI-151 Hydrostatic Level Sensor

Hydrostatic pressure for level measurement:

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

Featured Continuous level sensors

SI-U01 Float Level Sensor
SI-U02 Multi-Point Liquid Level Float Switch
SI-U03 Float Switch Water Level Controller
SI-U04 Magnetic Float Level Sensor-Reed Switch

Pressure level transmitter manufacturer

Sino-Instrument, we are the pressure level transmitter manufacturer in China.

We supply SMT3151LT pressure level transmitters.

We offer flamges:

  • DN50 (2″)
  • DN80 (3″)
  • DN100 (4″)
  • DN40
  • Flush flange
  • Insert barrel flange

And for the material of diaphragm, we offer :

316 Stainless steel
Hastelloy C
Monel
Tantalum
Titanium
Special requirements

If you need to know more about the SMT3151LT pressure level transmitters,

you can refer to the :

SM3151LT liquid level pressure-differential pressure transmitterDownload

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SMT3151TR Hydrostatic Submersible Level Transmitter-Straight Rod Insertion

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The Submersible Level Transmitter is the most commonly used tank level indicator. There are stainless steel probes that are placed at the bottom of tanks, wells, or other liquid containers. Output 4-20mA signal. For liquid level measurement and control.

The difference between the SMT3151TR Hydrostatic Submersible Level Transmitter and other submersible level transmitters is that it is a straight rod insertion type.

  • Measuring range: select within 0 ～ 5m (more than 5m negotiate order)
  • Measurement accuracy: 0.5
  • Output signal: 4 ～ 20mADC; 0 ～ 20mA;
  • Working temperature: -50 ～ 80 ℃/ -50~450℃ （High temperature type）;
  • Wetted materials: stainless steel, polypropylene (PP), PTFE
  • Explosion-proof grade: ExiaIICT6Gb ExIICT6Gb

Sino-Inst offers a variety of Hydrostatic Submersible Level Transmitters for flow measurement. If you have any questions, please contact our sales engineers.

Request a Quote
Hydrostatic Level

Features of Hydrostatic Submersible level transmitter

  • Solid structure, no moving parts, high reliability and long service life;
  • From water to sewage, from oil to liquid with high viscosity, high-precision measurement can be carried out, and it is not affected by foaming and sedimentation of the medium;
  • With multi-purpose mounting bracket, easy to install and use;
  • Lightning protection design. Has good anti-interference and lightning protection capabilities;
  • With power reverse polarity protection and overload current limit protection;
  • The new material is not easy to fatigue and wear, and has strong resistance to vibration, impact and overload]
  • High temperature type can be customized. High temperature reaches 450 ℃.

Extended reading: HART protocol digital signal (two-wire system)

Specifications of Submersible Level Transmitter

Measuring range:0~5m
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
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

Applications of Submersible Level Transmitter

Sino-Inst’s Hydrostatic Level Transmitter is used in various industrial and municipal environments. Especially in water supply and wastewater treatment plants. Mainly used for water level measurement of urban water supply, oil tanks, petrochemical and other open tanks.

Hydrostatic Level Transmitter measures the hydrostatic pressure of a liquid medium. Liquid level information is transmitted through electrical signals. The signal changes linearly and proportionally. To measure the hydrostatic pressure above the sensor.

If your measurement range is greater than 5 meters, please refer to Submersible Pressure Transducer.

If you are measuring the fuel tank level, you can choose a magnetostrictive liquid level sensor with higher accuracy and longer service life.

More Featured Hydrostatic Level Transmitters

SI-151 Hydrostatic Level Sensor
SI-PCM261 Submersible Pressure Transducer
SI-PCM260 Deep Well Water Level Sensor

Installation of Submersible Level Transmitter

The rod type static pressure liquid level transmitter has two standard installation methods of G11 / 2 thread and flange.

Thread installation
For the transmitter that is directly installed with G11 / 2 thread, a G11 / 2 round nut is provided at the time of delivery. Generally, there are two ways for installation.

  1. The installation position has G11 / 2 thread. The liquid level transmitter can be screwed in directly. The attached round nut can be used or screwed on to prevent loosening.
  2. There is no G11 / 2 thread in the installation position. Can use the existing Φ50 ~ Φ60 light hole, or install a bracket with Φ50 ~ Φ60 hole. Install the liquid level transmitter, and screw on the round nut to fix it.

Flange mounting
The standard installation dimensions of flanges are in accordance with DN50, GB9119.6-88
If there are other flange mounting holes in the installation location, please indicate the flange size or the corresponding specifications and standard numbers when ordering, in order to meet the installation requirements.

Of course, we can also directly measure the liquid level with a pressure transmitter. For example, install a Hydrostatic pressure transmitter directly at the bottom of the tank. The installation is shown on the right.
If you want to measure the tank liquid level like this, you can refer to:

Flange Mounted Differential Pressure Transmitter
Diaphragm Seal Pressure Transmitter
Hydrostatic Pressure Sensor/Transmitter

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.

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

Submersible level transmitter working principle

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.

Let’s see How is hydrostatic pressure measured ?

Video source: https://www.youtube.com/watch?v=T2OPoEod_jM&feature=emb_logo

Hydrostatic level transmitter advantages and disadvantages

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

Extended reading: Hydrostatic Pressure Transmitter

Hydrostatic level transmitter price

Compared with other liquid level transmitters, Hydrostatic level transmitter has lower cost. The price of Hydrostatic level transmitter 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 transmitter. Sino-Inst provides customers with the best Hydrostatic level transmitter 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.

Submersible level transmitterDownload

Frequently
Asked
Questions

Help Center

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.

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.

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

Sino-Inst is a globally recognized supplier and manufacturer of Hydrostatic level transmitter.
Submersible Level Transmitter instrumentation, 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.Send RFQ NOW, You may get the price now.

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DP Level Transmitter-Differential Pressure Tank Level Measurement

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DP Level Transmitter uses pressure readings and the specific gravity of the medium to calculate the liquid level. Differential pressure level measurement is a common measurement technology. It can be used for closed-tank and open-tank level measurements.

The DP Level Transmitter measurement system includes differential pressure transmitters, flanges, seal diaphragms, capillaries, wet legs/dry legs, and DP transmitters.

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

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Featured DP Level Transmitters

Smart Differential Pressure Transmitter
Flange Mounted DP Transmitter
Extended Diaphragm Seal DP Level Transmitter
Remote Seal Differential Pressure Transmitter

There are 5 types of remote transmission devices for remote differential pressure transmitters:

  1. Flat type
  2. Thread mounting type
  3. Flange mounting type
  4. Extended Diaphragm Seal
  5. Wet legs/Dry legs

Specifications of DP level transmitter

Measuring mediumLiquids, gases, and steamPressure range0-0.1kpa-40mpa
Signal output4-20mA, superimposed Hart protocol, RS485Plywood materialAll 316L stainless steel
Supply voltage12-30VDCPrecision± 0.2% FS, ± 0.1% FS, ± 0.075% FS (customizable)
Diaphragm material316L, customizable Ha C, tantalum, Monel alloyTemperature compensation-10 ~ + 70 ℃
Long-term stability (1 year)≤ ± 0.25% FSOperating temperature-20 ~ + 100 ℃
Overload pressure200% FSZero rangeExternal continuously adjustable
Destruction pressure300% FSPower effectLess than 0.005% / V of the output range
Weight3.9KG (standard type)Protection levelIP65
Volume uptakeLess than 0.16cm3Load impactIf the power supply is stable, the load has no effect
SM3151LT liquid level pressure-differential pressure transmitterDownload

Applications of DP level transmitters

The differential pressure liquid level transmitter can prevent the measured medium from directly contacting the sensor diaphragm of the transmitter. It is suitable for the following situations:

  1.  When the measured medium has a corrosive effect on the transmitter connector and sensitive components;
  2. When the high temperature measured medium needs to be isolated from the transmitter;
  3. When there are solid suspended solids or high viscosity in the measured medium, it is easy to block the transmitter connector and the pressure chamber;
  4. When the measured medium is easily cured or crystallized by the pressure tube;
  5. When changing the measured medium needs to be rinsed and not to be mixed;
  6. Hygienic conditions must be maintained to prevent pollution. .
  7. Changing the measured medium requires strict purification of the measuring head
  8. Suspended liquid or high viscosity medium
  9. Measurement of sealed pressure vessel.

Read more What is a diaphragm seal?

Differential pressure type level transmitter working principle

The differential pressure level transmitter is an instrument that uses the pressure generated by the liquid column to measure the height of the liquid level. When the liquid level changes, the pressure received by the diaphragm at the high-pressure side flange will change accordingly. The differential pressure value calculated by the transmitter will also change accordingly. There is a linear relationship between them.

Normally, the high-pressure side (H side) and the low-pressure side (L side) cannot be installed reversely. Generally, the H side is installed at the lower part of the equipment, and the L side is installed at the higher part of the equipment. Before installation, the flange surface of the equipment should be cleaned and the gasket should not be placed off-center to prevent the diaphragm from being punctured or deformed, causing distortion of the transmitter.

SMT 3151 Differential Pressure Level Measurement

Differential pressure transmitter level measurement calculation

When using a Differential pressure (DP) level transmitter to measure the liquid level as shown in the figure below.

The measured liquid density in the figure is ρ.
The working medium density in the capillary of the double flange differential pressure transmitter is ρ0.
The measuring range of the measured liquid level is H.
The center distance of the sampling tube of the measured liquid level is h.

It can be seen from the figure that the maximum measurement range of the liquid level △ P = P + — P- = H × ρ × g – h × ρ0 × g.

It can be seen from the formula that the dual-flange differential pressure transmitter should perform negative migration. The migration amount S is h × ρ0 × g. And the installation position of the double flange differential pressure transmitter has no effect on the migration amount and the measurement result.

The dual-flange differential pressure transmitter requires negative migration.

When the measured liquid level is 0, the pressure difference between the positive and negative measurement chambers of the remote differential pressure transmitter is the largest. The output current of the double flange differential pressure transmitter is 4mA.

As the measured liquid level rises, the pressure difference between the positive and negative measurement chambers of the transmitter gradually decreases.

When the measured liquid level rises to the highest Hmax. The pressure difference between the positive and negative measurement chambers of the transmitter is the smallest. The output current of the double flange differential pressure transmitter is 20mA.

Read more about: Differential Pressure Transmitter Installation Guide

DP level transmitter calibration

The differential pressure liquid level transmitter has been calibrated in the range, accuracy, linearity and other parameters according to customer requirements at the factory. And mark the range, accuracy, etc. on the nameplate of the differential pressure liquid level transmitter. As long as the density and other parameters of the measured medium meet the requirements of the nameplate, generally no adjustment is required.

If the customer needs to adjust the range or zero position, please adjust according to the following methods. Assuming that the range of the differential pressure liquid level transmitter is 0 ~ 10 meters:

  1. Unscrew the protective cover of the differential pressure liquid level transmitter. It can be adjusted by connecting an external standard 24VDC power supply and ammeter (requires accuracy of 0.2% or above).
  2. When there is no liquid in the differential pressure liquid level transmitter. Adjust the zero potentiometers. Make it output a current of 4mA.
  3. Pressurize the differential pressure liquid level transmitter to full scale (10 meters). Adjust the full-scale resistor. Make it output a current of 20mA.
  4. Repeat the above steps two or three times until the signal is normal.
  5. Please input 25%, 50%, and 75% signals to check the error of the differential pressure liquid level transmitter.
  6. For non-aqueous media. Differential pressure level transmitters are calibrated with water. It should be converted according to the pressure generated by the actual density of the medium. For example, when the medium density is 1.3, the 1.3m water level should be used to calibrate the 1m range.
  7. After adjustment, tighten the protective cover.
  8. The verification cycle of the differential pressure liquid level transmitter is once a year.
  9. HART intelligent differential pressure liquid level transmitter of Sino-Inst instrument can be selected. It is convenient to adjust the range of the differential pressure liquid level transmitter.

Extended reading: How to calibrate HART pressure transmitters

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More Pressure and Level Measurement Solutions

Sino-Inst (drurylandetheatre.com) offers over 20 DP transmitters for liquid level, pressure, flow, and density measurement. Differential pressure (DP) level transmitters are suitable for measuring water and other liquid level.

We are a differential pressure level transmitter supplier, located in China. Our products are widely exported to the United States, Australia, Singapore, Indonesia, etc. You can ensure product safety by selecting from our products, including IOS9000, and… certification.

If you need to purchase DP Level Transmitters or have related technical questions, please feel free to contact our sales engineers!

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