SMT3151TR Hydrostatic Submersible Level Transmitter-Straight Rod Insertion

Q: What is ultrasonic level transmitter?

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.

Posted on May 28, 2019 by KimGuo11

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.

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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.

Level measurement in rivers and lakes
Level measurement in vessel and storage systems
Control of sewage lift and pumping stations
Monitoring of sewage, settling and stormwater retention basins

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-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.

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.
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**

**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.

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

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.

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:

Range range;
Medium temperature;
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 transmitter Download

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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KimGuo11

Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.

Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.

drurylandetheatre.com

3051HP Hydrostatic Pressure Transmitter

Posted on May 27, 2019 by KimGuo11

What is hydrostatic pressure transmitter?

Hydrostatic Pressure Transmitters is an instrument that measures the hydrostatic pressure or differential pressure exerted by a hydrostatic head.

Feel the measured pressure through the remote transmission device installed on the pipeline or container. The pressure is transmitted to the main body of the transmitter through the filling silicone oil (or other liquid) in the capillary tube. Then there is the delta chamber and the amplifier circuit board in the main body of the transmitter. Convert into 4-20mA DC signal output. HP Smart can communicate with a HART handheld communicator. Use it to set, monitor, or form an on-site monitoring system with the host computer.

Hydrostatic Pressure Transmitters are often used to measure the level, flow, and pressure of liquids, gases, or steam under high working pressure environments.

RFQ

Pressure Transmitters

Features
Specifications
Applications

Features of Hydrostatic Pressure Transmitter

The Hydrostatic pressure transmitter is used to measure the liquid level, flow, and pressure of the liquid, gas or steam under high working pressure, and then convert to 4~20mA DC signal output.

The high hydrostatic pressure transmitter can measure differential pressure below 32MPa hydrostatic pressure.
With 32MPa working pressure and overload protection.
Ensuring reliable application of the transmitter in Hydrostatic pressure systems.

Specifications of Hydrostatic Pressure Transmitter

Measure Range of Hydrostatic pressure sensor:

Differential pressure: 0-1.3-6790KPa
Hydrostatic pressure: 32MPa

Use object: liquid, gas or steam
Output signal: 4-20mA dc. Output superimposed HART protocol digital signal (two-wire system)
Power source: external power supply 24V dc. Power supply range 12V ~ 45V
Installation in dangerous places:
- Flameproof ExdIIBT5Gb;(explosion-proof certificate no. :CE16.1163)
- Intrinsically safe ExiaIICT4/T5/T6Ga;（explosion-proof certificate no. : CE15.2354X） ;
Accuracy: ± 0.1%, ±0.2%
Stability: ±0.25%/6 months of maximum range

Model	Transmitter type
HP	Absolute pressure transmitter
Code	Scale range
2	0-0.10～3.5kPa(0-10～350mmH₂O)
3	0-0.8～8.0kPa(0-80～800mmH₂O)
4	0-4.0～40kPa(0-400～4000mmH₂O)
5	0-20～200kPa(0-2000～20000mmH₂O)
6	0-70～700kPa(0-0.7～7kgf/cm²)
7	0-210～2100kPa(0-2.1～21kgf/cm²)
8	0-700～7000kPa(0-7.0～70kgf/cm²)
9	0-2.1～21MPa(0-21～210kgf/cm²)
0	0-4.1～41MPa(0-41～4100kgf/cm²)
Code	Output form
E	Linear output 4-20mAdc
SF	Linear/square root output 4-20mAdc +HART signal,，Full function buttons on site
F	MODBUS-485 signal
Code	Structural materials
	Flange connector	Exhaust/Drain valve	Isolation diaphragm	Filling liquid
22	316 Stainless steel	316 Stainless steel	316 Stainless steel	Silicone oil
23	316 Stainless steel	316 Stainless steel	Hastelloy C	Silicone oil
24	316 Stainless steel	316 Stainless steel	Monel	Silicone oil
25	316 Stainless steel	316 Stainless steel	Tantalum	Silicone oil
33	Hastelloy C	Hastelloy C	Hastelloy C	Silicone oil
35	Hastelloy C	Hastelloy C	Tantalum	Silicone oil
44	Monel	Monel	Monel	Silicone oil
Code	Shell material	Conduit inlet dimensions
A	Low copper aluminum alloy polyurethane coating	M20×1.5
B	Low copper aluminum alloy polyurethane coating	1/2-14 NPT
C	Stainless steel	M20×1.5
D	Stainless steel	1/2-14 NPT
Code	Pressure connection
L1	1/4NPT-18 Internal thread（excluding waist joint standard）
L2	1/2NPT-14 Internal thread
L3	M20×1.5 External thread
Code	Optional parts
M4	LCD multi-power digital display head
B1	Pipe bending bracket
B2	Plate bending bracket
B3	Pipe mounting bracket
C02	M20×1.5 nut and Φ 14 pressure short tube
C12	1/2NPT-14 external thread and Φ14 pressure short tube
C22	1/4NPT-18 external thread and Φ14 pressure short tube
C32	1/4NPT-18 to M20×1.5 external thread
C42	1/2NPT-14 to M20×1.5 external thread
C43	1/2NPT-14 to 1/4NPT-18 internal thread
C44	1/2NPT-14 to 1/2NPT-14 external thread
C45	1/2NPT-14 to G1/2 external thread
D1	The side discharge valve is on the upper part
D2	The side discharge valve is on the upper part
X1	Oil ban
Da	Flameproof ExdIIBT5Gb;(explosion-proof certificate no. : CE16.1163)
Fa	Intrinsically safe ExiaIICT4/T5/T6Ga;(explosion-proof certificate no. : CE15.2354X)

Hydrostatic Pressure Transmitter Applications

Viscous medium at high temperature
Crystallizable medium
Precipitating medium with solid particles or suspended matter
Strong corrosive or highly toxic medium
It can eliminate the phenomenon that the pressure guiding tube leaks and pollutes the surrounding environment. It can avoid the instability of the measurement signal when the isolation fluid is used. The tedious work of frequently supplementing the isolation fluid is required.
Continuous and accurate measurement of interface and density
The remote transmission device can avoid the mixing of different instantaneous media. So that the measurement result truly reflects the actual situation of the process change.
Occasions requiring high hygiene and cleanliness
For example, in the production of food, beverage and pharmaceutical industries, it is not only required that the parts of the transmitter contacting the medium meet the hygienic standards. It should also be easy to wash. To prevent cross-contamination of different batches of media.

Extended reading: Silicon Pressure Sensor

Hydrostatic Pressure

Hydrostatic pressure is the pressure generated by the weight of the liquid above the measurement point when the liquid is stationary. The height of the liquid column with uniform density is proportional to the hydrostatic pressure. As the weight of the fluid exerting downward force from above increases, the hydrostatic pressure increases in proportion to the depth measured from the surface.

If the fluid is inside the container, the depth of the object placed in the fluid can be measured.
The hydrostatic characteristics of a liquid are not constant, and the main factors affecting it are the density and local gravity of the liquid. In order to determine the hydrostatic pressure of a particular liquid, both quantities need to be known.

The deeper an object is placed in a fluid, the greater the pressure it bears. This is because the weight of the fluid is higher than its weight. Due to the weight of the fluid, the denser the fluid above it, the greater the pressure on the submerged object.

Measuring principle

The pressure in the liquid increases as the filling height increases. The hydrostatic pressure is transmitted to the measuring unit through the stainless steel diaphragm. Bubbling, accumulation of liquids, fluctuating electrical characteristics, and container design will not affect the measured value.

Extended reading: What is flush diaphragm?

Formula for calculating hydrostatic pressure

The formula for calculating the hydrostatic pressure of a column of liquid is:

P_hyd = h.ρ.g

P_rel = h.ρ.g

P_abs = h.ρ.g + P_atm

P_hyd = Hydrostatic Pressure (Pa)
Prel = Relative Pressure (Pa)
Pabs = Absolute Pressure (Pa)
Patm = Atmospheric Pressure (Pa)
h = Liquid Height (m)
ρ = Liquid Density (kg/m3)
g = Local Gravity (m/s2)

The above calculation formula is also the working principle of hydrostatic liquid level sensor.

The hydrostatic pressure sensor measures the hydrostatic pressure applied by the hydrostatic head. Output 4-20mA.
Use a hydrostatic pressure transmitter to measure the storage tank and pump inlet. And other applications where hydrostatic pressure is used to determine the liquid level.

Hydrostatic Pressure Sensor/Transmitter can also be used with paperless recorder.

Hydrostatic Level Sensor measures the hydrostatic pressure by the submersible pressure sensor. The static pressure of the liquid is proportional to the height of the liquid. Then the static pressure was converted into an electrical signal. Convert to analog signal output or 4-20mADC. With digital display. For water level measurement, hydrostatic level sensor is a low cost type. Different types of measuring cells are used in level measurement based on the hydrostatic principle.

Lightning protection, anti-corrosion, explosion-proof optional. IP68 is optional.

Read more about: Hydrostatic Level Sensor

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

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

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

Extended reading: Static pressure vs dynamic pressure vs total pressure

There are various methods and techniques for measuring fluid level using hydrostatic pressure sensors. Depending on the installation, they all have advantages and disadvantages. Hydrostatic pressure measurement is an accurate and convenient technique for determining fluid height or volume.

Let’s take a look at each according to the installation location of the hydrostatic pressure sensor.

Externally mounted type

Image source: https://www.yourlevelexperts.com/zh-hant/product/hydrostatic-pressure/

The Hydrostatic pressure liquid level sensor can be installed to the outside of the container through threads or flange fittings. If necessary, capillaries can also be used.

Submersible type

If the externally mounted sensor is not available, a submersible pressure sensor can be used. The electrical connection with IP68 rating is suitable for long-term permanent immersion. The electronic equipment of the sensor can be protected from the external environment.

**Remote Diaphragm Seal Pressure Transmitter**

**SMT3151LT Pressure Level Transmitter**

DP transmitters are Differential Pressure Transmitters. DP transmitter measures the pressure difference between the gas or liquid at both ends of the transmitter. Output 4~20mA, 0~5V. Used for liquid level, density, and pressure of liquid, gas, and steam.

DP transmitters are different from pressure transmitters as they have 2 pressure interfaces. With flanges, capillaries, valves, brackets, throttle devices. Differential pressure transmitters are used to measure the level, density, and flow of liquids, gases, and vapors. Then convert it into 4–20mADC current signal output.

Hydrostatic pressure transmitter fault debugging steps:

How to debug the fault of Hydrostatic pressure transmitter

Total Time: 30 minutes

Check the power supply

Check if the power supply of the differential pressure transmitter is reversed, and whether the positive, and negative poles of the power supply are connected correctly.

Measure the power supply

Measure the power supply of the transmitter, whether there is 24V DC voltage. It must ensure that the power supply voltage to the transmitter is ≥12V
(that is, the voltage of the transmitter power input terminal is ≥12V).
If there is no power supply, check whether the circuit is disconnected, whether the instrument is selected incorrectly (input impedance should be ≤250Ω), and so on.

Check the display meter

If the pressure transmitter is equipped with a meter head, it is necessary to check whether the dislay meter is damaged. You can short-circuit the two wires of the meter head first. If it is normal after a short circuited, it means the head is damaged.
If the meter head is damaged, Then you need to change the header.

Check the current

If there is a problem with the differential pressure transmitter, connect the ammeter to the 24V power supply circuit to check if the current is normal.
If it is normal, the transmitter is normal. In this case, check if other instruments in the loop are normal.

Connect the power supply

Connect the power supply to the transmitter power input terminal, and connect the power cable to the power supply wiring port.
If you still have any question with the selection, application, and use of pressure transmitters, you can just contact our engineer today.

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Hydrostatic pressure transmitter/sensor measures the level, density, and pressure of liquid, gas, or steam. And then converts it into a 4-20 mA DC signal output. The Hydrostatic pressure transmitter can communicate with the HART communicator intelligently. Use it to set, monitor or form a site monitoring system with the host computer. Use a Hydrostatic pressure sensor to measure tanks, processing vessels, headers, pump inlets and others using hydrostatic pressure to determine the liquid height. SI3051HP Hydrostatic pressure transmitters, with working Hydrostatic pressure up to 32Mpa.

Extended reading: Best Price Ceramic Pressure Sensor

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

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KimGuo11

drurylandetheatre.com

OEM Pressure Sensor-General Industrial Applications

Posted on May 27, 2019 by KimGuo11

OEM Pressure Sensor is an economical product. It uses all stainless steel wetted parts, has a compact size and high cost performance.

This pressure transmitter measures gauge pressure and absolute pressure. The measurement system is fully welded and can be used for most liquid and gas media. This series provides a variety of electrical outputs as well as electrical connections and pressure interfaces to meet most application requirements. The compact structure is very suitable for installation in a small space.

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

Industrial OEM Pressure Sensor Features

Measuring range: 0-0.6,1,2,5,10,20,30,40,50,60 ～ 150MPa;
Available in gauge, absolute and sealed gage styles;
Constant current / constant voltage power supply;
Isolated structure, suitable for a variety of fluid media;
Standard OEM pressure sensitive element;
All 316L stainless steel;
Tantalum diaphragm optional, titanium structure optional;
Standard male thread pressure connection available;
Flexible customer customization ;

Specifications

Measuring range: 0-0.6,1,2,5,10,20,30,40,50,60 ～ 150MPa
Comprehensive accuracy: 0.1% FS, 0.25% FS, 0.5% FS
Output signal: 1.0mV / V, 1.5mV / V, 2.0mV / V
Power supply voltage: 10VDC (3 ～ 15VDC)
Output impedance: 350/1000/1650 / 2000Ω
Medium temperature: -20 ～ 85 ℃ ～ 125 ℃
Ambient temperature: -20 ～ 85 ℃
Insulation resistance: greater than 2000MΩ / 100VDC
Response time: <1-5ms
Sealing grade: IP65
Long-term stable performance: 0.15% FS / year
Vibration effect: within the mechanical vibration frequency of 20Hz ~ 1000Hz, the output change is less than 0.1% FS
Electrical connection: red-positive power, black (yellow)-negative power, blue-positive signal, white-negative signal
Mechanical connection: M20 × 1.5, other threads can be customized according to customer requirements

5 Types of Industrial Pressure Sensors

Piezoelectric pressure sensor:

Piezoelectric effect is the main working principle of piezoelectric sensors. Piezoelectric sensors cannot be used for static measurement. Because the charge after external force is applied, it can only be saved when the loop has infinite input impedance. This is not the case, so this determines that piezoelectric sensors can only measure dynamic stress.

Ceramic pressure sensor:

Ceramic pressure sensors are based on the piezoresistive effect. Pressure directly acts on the front surface of the ceramic diaphragm, causing the membrane to deform slightly. Thick film resistors are printed on the back of the ceramic diaphragm and connected into a Wheatstone bridge. Because of the varistor The piezoresistive effect makes the bridge generate a voltage signal that is highly linear and proportional to the pressure and proportional to the excitation voltage. The standard signal is calibrated to 2.0 / 3.0 / 3.3mv / v according to different pressure ranges. Strain sensors are compatible.

Diffused silicon pressure sensor:

The working principle of a diffused silicon pressure sensor is also based on the piezoresistive effect. Using the piezoresistive effect principle, the pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramic). The diaphragm produces a micro-displacement proportional to the pressure of the medium. Change the resistance value of the sensor. Use electronic circuits to detect this change, and convert and output a standard measurement signal corresponding to this pressure.

Sapphire pressure sensor:

Utilizing strain-resistance working principle. Using silicon-sapphire as the semiconductor sensitive element has unparalleled metrological characteristics. Therefore, silicon-sapphire semiconductor sensitive components are used. They are not sensitive to temperature changes and have good working characteristics even under high temperature conditions. Sapphire has extremely strong radiation resistance. In addition, silicon-sapphire semiconductor sensitive components, pn drift.

Piezoresistive force sensor:

Resistance strain gage is one of the main components of a piezoresistive strain sensor. The working principle of a metal resistance strain gage is that the resistance of the strain resistance absorbed by the base material changes with the mechanical deformation.

Applications of OEM pressure sensor

Industrial process control: liquid level measurement, gas, liquid pressure measurement;

Pressure testing instruments: pressure calibration instruments, hydraulic systems and switches; refrigeration equipment and air conditioning systems, aviation and marine testing.

OEM pressure transmitter manufacturer in China

Sino-Inst sensors are produced in three basic configurations: gauge pressure sensors, absolute pressure sensors and sealed gauge pressure sensors.

A large percentage of OEM pressure sensors produced by Sino-Instrument, are used in our own pressure transducers, and pressure transmitters, so Sino-Inst understands the OEM viewpoint.

Whatever the need, Sino-Inst can provide the solution!

Request a Quote

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KimGuo11

drurylandetheatre.com

SMT3151AP Absolute Pressure Transmitter

Posted on May 24, 2019 by KimGuo11

Absolute pressure transmitters measure the absolute pressure of the medium in the equipment. Its reference pressure is the absolute value 0 (vacuum), which has nothing to do with atmospheric pressure. Therefore, there is a vacuum sealed chamber on the low-pressure side of the pressure core.

When the fluctuation amplitude of the actual atmospheric pressure affects the process parameters beyond the allowable range, the use of absolute pressure transmitters is necessary. For example, in places where the local average atmospheric pressure deviates greatly from the standard atmospheric pressure.

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

Absolute Pressure Transmitter Features

Direct Mount Pressure-Absolute Pressure Transmitter

Sensor Type : Industrial Pressure Transducers
Full function buttons on site
Pressure ranges: 0 … 1 mbar up to 0 … 600 bar
Output/Span : 0 – 10 V, 0 – 5 V, 1 – 5 V, 10 mV/V, 4 – 20 mA, HART
Pressure Port/Fitting : 1/2 MNPT, 1/4 FNPT, 1/4 MNPT, 1/8 MNPT
Operating Temperature Range: -40 – 85 °C [ -40 – 185 °F ]

Extended reading: How to calibrate HART pressure transmitters

Specifications

Application:	Liquid, gas or steam
Measurement range:	0-41MPa
Output signal:	4~20mAdc. output, superimposed HART protocol digital signal (two-wire system)
Power supply:	External power supply 24Vdc., power supply range 12V~45V
Hazardous location installation:	Explosion-proof type ExdIIBT5Gb; Intrinsically safe type ExialCT.4/T5/T6Ga;
Migration characteristics:	At the minimum range (range compression ratio is 40:1), the maximum positive migration zero point is 39/40 times the upper limit of the range. The maximum negative migration zero point can be the lower limit of the range. The absolute pressure transmitter has no negative migration. (No matter what the output form is, after the positive and negative migration, the upper and lower limits of the range shall not exceed the range limit)
Temperature range:	The electronic circuit board works at -40~85℃; the sensitive element works at -40~104℃; the storage temperature works at -40~85℃: with digital display works at -25~75℃ (operation); -40~85℃ (no damage)
Relative humidity:	0~95%
Overpressure limit:	Range 3 to 8 withstand 0 (absolute pressure) ~13.78MPa, pressure transmitter without damage; range 9 pressure does not exceed 31.29MPa; range 0 pressure does not exceed 51.4MPa: normal working pressure is 3.43kPa (absolute pressure) to the upper limit of the range.
Volume change:	Less than 0.16cm3
Damping:	The time constant is adjustable between 0.2~32.0s.
Accuracy:	±0.1%, ±0.075%
Stability:	±0.1% of the maximum range/12 months
Temperature effect:	The temperature error including zero point and range is ±0.2% of the maximum range/20℃
Power supply effect:	Less than 0.005%/V of the output range.
Vibration effect:	In any axis, the frequency is 200Hz, and the error is ±0.05%/g of the maximum range.
Load effect:	As long as the voltage of the input transmitter is higher than 12V, there is no load influence in the load working area.
Installation position effect:	The maximum zero position error that can be generated is no more than 0.2kP, which can be eliminated by correction without affecting the range; the rotation of the measuring body relative to the flange has no effect.
Note: Under no migration, 316 stainless steel isolation diaphragm and other standard test conditions.

Order Guide

Model	Transmitter type
GP	Pressure transmitter
AP	Absolute pressure transmitter
Code	Scale range
2	0-0.10～3.5kPa(0-10～350mmH2O)
3	0-0.8～8.0kPa(0-80～800mmH2O)
4	0-4.0～40kPa(0-400～4000mmH2O)
5	0-20～200kPa(0-2000～20000mmH2O)
6	0-70～700kPa(0-0.7～7kgf/cm2)
7	0-210～2100kPa(0-2.1～21kgf/cm2)
8	0-700～7000kPa(0-7.0～70kgf/cm2)
9	0-2.1～21MPa(0-21～210kgf/cm2)
0	0-4.1～41MPa(0-41～4100kgf/cm2)
Code	Output form
E	Linear output 4-20mAdc
SF	Linear output 4-20mAdc+HART signal，Full function buttons on site
F	MODBUS-485 signal

Code	Pressure connection
L1	1/4NPT-18 Internal thread (excluding waist joint standard)
L2	1/2NPT-14 Internal thread
L3	M20×1.5 External thread
Code	Optional parts
M4	LCD multi – power digital display head
B1	Pipe bending bracket
B2	Plate bending bracket
B3	Pipe mounting bracket
D0	The discharge valve is at the end
D1	The side discharge valve is on the upper part
D2	The side discharge valve is on the upper part
C02	M20 x 1.5 nut and Φ 14 pressure short tube
C12	1/2NPT-14 external thread and Φ14 pressure short tube
C22	1/4NPT-18 external thread and Φ14 pressure short tube
C32	1/4NPT-18 to M20×1.5 external thread
C42	1/2NPT-14 to M20×1.5 external thread
C43	1/2NPT-14 to 1/4NPT-18 internal thread
C44	1/2NPT-14 to 1/2NPT-14 external thread
C45	1/2NPT-14 to G1/2 external thread
X1	Oil ban
Gd	Measure the gold-plated membrane box
Da	Flameproof ExdIIBT5Gb;(explosion-proof certificate no. : CE16.1163)
Fa	Intrinsically safe ExiaIICT4 / T5 / T6Ga;(explosion-proof certificate no. : CE15.2354X)

Code	Flange connector	Exhaust/Drain valve	Isolation diaphragm	Filling liquid
22	316 Stainless steel	316 Stainless steel	316 Stainless steel	Silicone oil
23	316 Stainless steel	316 Stainless steel	Hastelloy C	Silicone oil
24	316 Stainless steel	316 Stainless steel	Monel	Silicone oil
25	316 Stainless steel	316 Stainless steel	Tantalum	Silicone oil
33	Hastelloy C	Hastelloy C	Hastelloy C	Silicone oil
35	Hastelloy C	Hastelloy C	Tantalum	Silicone oil
44	Monel	Monel	Monel	Silicone oil
Code	Shell material	Conduit inlet dimensions
A	Low copper aluminum alloy polyurethane coating	M20×1.5
B	Low copper aluminum alloy polyurethane coating	1/2-14 NPT
C	Stainless steel	M20×1.5
D	Stainless steel	1/2-14 NPT

Read more about: Common Units Of Pressure

What is the absolute pressure?

The pressure expressed with complete vacuum as the zero standard is called absolute pressure. Absolute pressure has only positive values.

What is absolute pressure transmitter?

Absolute pressure (AP) transmitter measure relative to perfect (full) vacuum pressure (absolute zero pressure).

Therefore, AP transmitters are not affected by fluctuations in the local atmosphere.

All absolute pressure measurements are positive. The letter ‘a’ or the abbreviation ‘abs’ in the unit of measure (i.e., inH₂O(abs) or psia) indicates an absolute pressure measurement.

Any critical storage and delivery (toxic gases) will change due to atmospheric conditions. So these systems must be accurate and use static references.

Absolute pressure transmitters are used in applications where the pressure of a gas or liquid is isolated from changes in atmosphere. For example, when testing a sealed pressure vessel for leaks for a long time.

How do absolute pressure sensors work?

The absolute pressure transmitter is mainly composed of two parts. One part is directly connected to the side to be measured. The other side is designed as an absolute vacuum reference chamber. This makes the two compartments form Absolute pressure. When the pressure on both sides is inconsistent, the difference signal will be transmitted through a special transmission line. The computer system in the background can calculate the difference. The pressure value on the measured side is directly displayed.

Applications for Absolute Pressure Sensors

Absolute pressure sensors and absolute pressure gauges are often used for industrial high-performance vacuum pumps that need to be monitored.
It is used to vacuum pack medical products in a clean environment. To ensure hygienic and sterile delivery to hospitals and doctors.
In the food industry, vacuum packaging can be used when the highest possible vacuum is required to prevent oxygen from deteriorating perishable foods. This greatly extends the flavor and shelf life of the product.
In meat packaging, a vacuum that meets the requirements must be generated. This can safely guarantee the longest shelf life.
And pressure sensors affected by the atmosphere cannot monitor the high end of the vacuum.
Applications that require true absolute pressure sensors and instruments can also be found in scientific laboratories, universities, military and aerospace industries.

Sino-Inst supplies Direct Mount Pressure / Absolute Pressure Transmitter.

SM3151 TAP Pressure-absolute pressure transmitter shape and installation dimensions

Absolute pressure transmitter calibration

First make a 4-20mA fine adjustment. It is used to calibrate the D / A converter inside the transmitter. Because it does not involve sensing components, no external pressure signal source is required.
Do a full fine-tuning again. Make the 4-20mA, digital reading coincide with the actual applied pressure signal. Therefore, a pressure signal source is required.
Finally, re-quantify the range. By adjusting the analog output 4-20mA and the external pressure signal source. Its function is exactly the same as the zero (Z) and range (R) switches on the transmitter shell.

Absolute pressure transmitter VS Gauge pressure transmitter

Absolute pressure transmitter

Absolute pressure transmitter can realize absolute pressure measurement in equipment such as degassing system, distillation tower, evaporator and crystallizer, and allows pressure under 10Mpa. The δ chamber side of the absolute pressure transmitter receives the measured absolute pressure signal. The other side is sealed into a high vacuum reference chamber. Then convert it into 4 ~ 20mA DC signal output.

Gauge pressure transmitter

A gauge pressure transmitter in the general sense is mainly composed of a load cell sensor (also called a pressure sensor), a measurement circuit and a process connection. It can convert the physical pressure parameters such as gas and liquid felt by the load cell sensor into standard electrical signals (such as 4 ~ 20mADC, etc.), and provide secondary indicators such as alarm indicators, recorders, and regulators for measurement and indication. And process regulation.

More Featured Pressure Transmitters and Pressure Measurement Solutions

**SI-703 Flush diaphragm pressure sensor**

**SI-PT series Melt Pressure Sensors/Transducers – High Temperature**

**SI-706 Combined Pressure and Temperature Sensor-Dual function**

**SI-512H High Temperature Pressure Sensor**

**High Frequency Dynamic Pressure Sensor**

Sino-Inst is Chinese manufacturer of absolute pressure transmitters. SMT3151AP absolute pressure transmitters, are our main products, which are widely used in USA, South Africa, and other countries.

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KimGuo11

drurylandetheatre.com

SI-2088 High Temperature Pressure Transducer

Posted on May 24, 2019 by KimGuo11

High Temperature Pressure Transducer is specially used for high temperature medium pressure measurement. Such as high temperature liquid, gas, steam, etc. The highest temperature is customized to 850℃.

High temperature resistant pressure sensor is selected as the signal measurement element. The transmitter structure includes a heat dissipation structure, and the high-precision signal processing circuit is located in the stainless steel housing. The sensor output signal is converted into a standard output signal, such as 4-20mA.

Sino-Inst is a manufacturer of high temperature pressure transducer in China. Committed to the manufacture, sales and engineering support of high temperature pressure sensors.

More Pressure Transmitters

Features of SI-2088 High Temperature Pressure Transducer

Working temperature –55 …850 ° C, customizable;
Pressure range can also be customized, such as 150MPa high pressure;
The sensor and pressure interface are fully welded structures, and the housing protection level is IP65;
The material in contact with the medium is stainless steel, which has good corrosion resistance;
It is suitable for pressure measurement of high temperature, low temperature and normal temperature media, and can work stably for a long time;
It is impact-resistant, vibration-resistant and corrosion-resistant;

High temperature pressure transducer for measuring lowest pressure fluctuations in a harsh environment up to 850 ° C. For applications in hazardous areas, the sensor is available with intrinsically safe Ex-ia and non-incendive Ex-nA certifications.

Specifications of High Temperature Transducer

Range:	0 ～ 1KPa ～ 10KPa ～ 400KPa, -0.1 ～ 0 ～ 1 ～ 60 (MPa), 0 ～ 10KPa ~ 100MPa, Other pressure ranges can be customized.
Comprehensive accuracy:	0.25% FS, 0.5% FS
Output signal:	4-20mA (2/4-wire system), 0-5 / 1-5 / 0-10V (3-wire system)
Power supply voltage:	24DCV (9 ～ 36DCV)
Medium temperature:	-30 ℃ ～ 160-350 ℃, customized up to 800 ℃.
Ambient temperature:	Normal temperature (-20 ～ 85 ℃)
Load resistance:	Current output type: maximum 800Ω; voltage output type: greater than 50KΩ
Insulation resistance:	Greater than 2000MΩ (100VDC)
Long-term stability:	0.1% FS / year
Vibration effect:	In the mechanical vibration frequency 20Hz ～ 1000Hz, the output change is less than 0.1% FS
Electrical interface:	Hessman connector (customizable)
Thread connection:	M20 × 1.5, etc. Other threads can be designed according to customer requirements
Dimensions:	M20 × Φ26.5 × 156
Shell protection:	Plug type (IP65); cable type (IP67)
Safety explosion-proof:	Ex iaⅡ CT5

Extended reading: High accuracy pressure transducers

Applications of high-temperature transmitters

SI2088 High Temperature Pressure Transducer used in the fields of steam, oil, boiler and heat energy exchange. Realize the measurement of liquid, gas and vapor pressure.

Application examples:

Industrial field process pressure detection;
Laboratory pressure calibration system;
Navigation and Shipbuilding;
Aviation and aircraft manufacturing;
Air separation equipment and thermal power unit;

Application of high-temperature transmitter

Extended reading: Common Pressure Sensor Applications

Application of high temperature pressure transmitter in steam pipeline

Pure steam pipes have good mechanical properties and thermal insulation properties. Under normal circumstances, it can withstand a high temperature of 120 ° C. It can withstand a high temperature of 180 ° C by modification or in combination with other thermal insulation materials.

It is suitable for thermal insulation of various cold and hot water high and low temperature pipelines. The pressure detection in the steam pipeline is very important. And because of the high temperature characteristics in the pipeline. Therefore, it is suitable to use the high temperature pressure transmitter designed by our company for such occasions.

Extended Reading: MEMS Pressure Sensors

In addition, in the steam system, water hammer (Water Hammer) is one of the main hazards causing casualties. Thereby eliminating the hazard of water hammer. This shows that daily pressure monitoring of the pipeline is very important.

Extended reading: High Temperature Flow Meter

Precautions for the correct use of steam pressure transmitters

   1. Prevent the steam pressure transmitter from contacting with corrosive or overheated media;
   2. Prevent dross from depositing in the conduit;
   3. When measuring gas pressure, the pressure port should be opened at the top of the pipeline, and the pressure transmitter should also be installed at the top of the pipeline, so that the accumulated liquid can be easily injected into the process pipeline;
   4. The pressure guiding pipe should be installed in a place with small temperature fluctuation;
   5. When measuring steam or other high-temperature media, a condenser such as a buffer tube (coil) should be connected, and the working temperature of the transmitter should not exceed the limit;
   6. When freezing occurs in winter, the transmitter installed outdoors must take anti-freezing measures to avoid the expansion of the liquid in the pressure port due to the frozen volume, resulting in the loss of the sensor;
   7. When wiring, pass the cable through the waterproof connector or the flexible tube and tighten the sealing nut to prevent the rainwater etc. from leaking into the transmitter housing through the cable.

High Temperature Pressure Transducers vs. Cooling Elements

Generally, the design method is to reduce the temperature near the pressure transmitter by incorporating mechanical cooling components to dissipate heat.

The cooling assembly may be filled with oil and isolated from the process medium by the isolation diaphragm.

Alternatively, the cooling assembly may include a hollow tube. The shape of the hollow tube is designed to increase heat transfer. This allows the process medium that is allowed to pass to be lowered to a much lower temperature.

The cooling element usually relies on the principle of convection heat transfer. This convective heat transfer principle is a mechanism for transferring heat due to the movement of fluid. In contrast, conductive heat transfer is the transfer of energy due to molecular vibration. In addition to cooling elements, convection is also used in many other engineering practices.

The cooling element may be able to reduce the temperature of the medium. This is usually a much cheaper solution than high temperature sensors. It is assumed that the medium density is not greatly affected by temperature changes within the normal operating range. Then this method can keep the pressure unchanged.

The cooling element usually works in air and water, but it is not suitable for oily media such as hydraulic oil. High temperature sensors must be used in these applications because the viscosity of this medium is highly temperature dependent.

The cooling element should be made of stainless steel so that most process media have maximum corrosion resistance. The nickel content of the steel is usually 1.25% and the chromium content is 0.65% to 0.8%.

The cooling element should withstand a maximum pressure of 5,000 psi at 38 ° C (100.4 ° F) and a maximum pressure of 3500 psi at 400 ° C (752 ° F). It also reduces the liquid process temperature at the sensing element from 260 to 38 ° C (500 to 100.4 ° F).

600 ℃ High Temperature Remote Pressure transmitter / Differential Pressure Transmitter

600 ℃ ultra-high temperature remote transmission pressure transmitter / remote transmission differential pressure transmitter cleverly uses the combination of ultra-high temperature silicone oil and internal isolation diaphragm. This makes the field application temperature greatly increased to about 600 ℃.

Greatly expanded the application range of ultra-high temperature pressure / differential pressure measurement. It can be widely used in coal chemical industry and CSP industry.

How to Select a Pressure Transducer For High Temperature Medium

Define your high temperature pressure transmitter requirements using this checklist:

Process temperature?
Cooling mechanism?
Ambient temperature?
Pressure range?
Output signal? 4-20mA
Electrical connection?
Process connection?
Process media type?

Featured Silicon Pressure Sensor

Posted on May 24, 2019 by KimGuo11

A Silicon Pressure Sensor is a pressure transmitter widely used in industry. It uses diffused silicon or ceramic piezoresistive sensors as pressure detection elements. It has strong overload capacity, good stability, and strong anti-interference ability. It has extremely high accuracy and repeatability, and the measurement interface has good corrosion resistance.

RFQ

Silicon Pressure Sensor Benefits

Silicon Pressure Sensor has a large signal output. It provides great advantages for the back-end transmission and conditioning circuit. It has high resolution and high sensitivity.
It can be compensated twice. The sensitivity temperature coefficient and zero temperature coefficient of Silicon Pressure Sensor can be compensated. Even the finished core can be compensated twice.
Silicon Pressure Sensors are relatively cheap and cost-effective.
The Silicon Pressure Sensor is small and easy to install. It can be installed and used in narrow locations.
316L stainless steel mechatronic structure with good durability.
Integrated dedicated chip, few discrete components, good temperature characteristics.

Industrial Silicon Pressure Sensor Technical Parameters

Pressure Media	Fluids, Gas
Supply Voltage	-30℃~160-350℃， customized up to -300~850℃
Operating Range	(Gage/Absolute Pressure)–Max(0～60)MPa, Min(0～0.5)KPa
Operating Range	(Negative Pressure)—Max(-100KPa～), Min(-0.2～0.2 )KPa
Accuracy	±0.5%(25℃)
Over Pressure	200% full scale
Long Term Stability	<0.25%FS per year
Response	<100ｍs
Output Signal	(4～20)mA+HART protocol（Current two-wire/three-wire, HART protocol）, etc.
Temperature Range	-30℃~160-350℃, Customized up to -300~850℃
Temperature Effects	0.00015%FS/℃
Pressure Connection	G1/2 female or user specified
Electrical Connection	Waterproof Connector(M20*1.5)
Protection Class	IP65

Silicon Pressure Sensor Applications

Silicon Pressure Sensor Mainly used to measure the pressure of gas, liquid and other objects. The parameters are then converted into standard telecom signals.

The application scope of diffusion silicon pressure transmitter mainly has the following:

Petroleum/Petrochemical/Chemical
Matched with the throttling device, it provides accurate flow measurement and control.
Measures pressure and level in pipes and tanks.
Electricity/city gas/other company business
Places such as measurement require high stability and high precision.
Pulp and paper
It is used in places requiring chemical resistance, corrosion resistance, etc.
Steel/non-ferrous metals/ceramics
It is used for furnace pressure measurement and other places requiring high stability and high precision measurement.
For use where stable measurements are required under strictly controlled (temperature, humidity, etc.) conditions.
Machinery/Shipbuilding
It is used in places where stable measurement is required under high-precision conditions such as strict control of temperature and humidity.

Extended reading: Featured Diaphragm Seal Pressure Transmitters

There are many types of pressure sensors. Such as resistance strain gauge pressure sensor. Semiconductor strain gauge pressure sensor. Piezoresistive pressure sensor. Inductive pressure sensor. Capacitive pressure sensor. Resonant pressure sensor, etc.

At present, the widely used pressure sensors include: diffused silicon piezoresistive pressure sensors, ceramic piezoresistive pressure sensors, sputtering film pressure sensors, capacitive pressure sensors, and sapphire pressure sensors with high temperature resistance.

But the most widely used is the piezoresistive pressure sensor, which has extremely low price, high precision and good linearity.

Extended reading: What is an air pressure transducer?

When the semiconductor silicon material is subjected to force, the atomic lattice changes.
That is, the spacing of the lattice changes. Then the carrier mobility of the silicon material changes.
changes, and the concentration changes. The lateral distribution structure and longitudinal distribution of carriers are disturbed.
The distribution structure of the material eventually leads to a change in the resistivity of the material. The above is half of the
A detailed elaboration of the piezoresistive effect of conductor silicon materials.

A pressure sensor that is also widely used, that is, a resistance strain sensor. Compared with a piezoresistive pressure sensor, the working process or working principle between the two is essentially different.

Piezoresistive Effect of Semiconductor Silicon Piezoresistive Pressure Sensor and Strain Effect of Metal Strain Gauge
The difference between the two should be: the output power of the former, that is, the change of the resistance value mainly depends on the material.
The change of the resistivity of the material. The output power of the latter, that is, the change of the resistance value depends on
Changes in material geometry (strain.

The sensitivity of semiconductor silicon material is high, and its sensitivity is 50 to 100 times that of metal strain gauges.

In 1954, Smith devoted himself to researching the piezoresistive effect of semiconductor silicon material. At the same time, he used it to make pressure sensors.

The silicon pressure sensor researched in the early stage is similar to the semiconductor strain gauge. After development and research, the N-type silicon wafer is doped with P-type impurities by diffusion or ion implantation. The resistance bar is customized. It is matched behind the resistance bar Connect a suitable bridge circuit to make an integrated chip.

It is the same as the use of resistance strain gauges. The chip cannot be used independently to complete the measurement work. It also needs to be firmly attached to the elastic element to sense the change in the measured pressure.

Diffused silicon piezoresistive pressure sensor refers to a sensor made by using the above-mentioned chip as a sensitive element.

The piezoresistive chip of the piezoresistive pressure sensor is packaged in a shell, and the periphery is fixed to form a silicon cup structure.

On the circular silicon diaphragm, four resistance strips with equal resistance value are made by the above-mentioned diffusion or ion implantation doping method.

Put two of them in the range of compressive stress. The other two are fixed in the range of tensile stress. Together they form a Wheatstone bridge measurement circuit.

Resistor strips are drawn from the bridge power supply terminal and output terminal.

The above-mentioned structure is packaged by the manufacturing method of an integrated circuit to obtain a diffused silicon piezoresistive pressure sensor.

Capacitive pressure sensor is a pressure sensor that uses capacitive sensitive elements to convert the measured pressure into an electrical output that has a certain relationship with it. The characteristics are that the input energy is low, the dynamic response is high, the natural effect is small, and the environmental adaptability is good.

It generally uses a circular metal film z or a metal-plated film as an electrode of the capacitor. When the film is deformed by pressure, the capacitance formed between the film and the fixed electrode changes. The output can be in a certain relationship with the voltage by measuring the circuit. electrical signal.

Capacitive pressure sensors belong to the polar distance variable capacitive sensors. They can be divided into single capacitive pressure sensors and differential capacitive pressure sensors

Current MEMS pressure sensors include silicon piezoresistive pressure sensors and silicon capacitive pressure sensors. Both are microelectromechanical sensors produced on silicon wafers.

The silicon piezoresistive pressure sensor uses high-precision semiconductor resistance strain gauges to form a Wheatstone bridge as a force-electricity conversion measurement circuit. It has high measurement accuracy, low power consumption and extremely low cost. Piezoresistive sensor for a Wheatstone bridge. If there is no pressure change, its output is zero and almost no power consumption.

Capacitive pressure sensors use MEMS technology to create a grid-like shape on a silicon wafer. The upper and lower two transverse barriers become a group of capacitive pressure sensors. The upper transverse grille is displaced downward by pressure. Changed the spacing between the upper and lower transverse grids. It also changes the size of the capacitance between the plates, that is, △ pressure = △ capacitance.

Extended reading: Industrial Pressure Transmitters|Buy from the manufacturer

Beginner’s Guide for HART Protocol

Posted on May 23, 2019 by KimGuo11

RFQ

The HART protocol is the most trusted communication protocol in recent years. It combines the characteristics of analog systems and digital control systems.

Field instruments in process plants are beginning to be subject to more complex metrology regulations. Most new field instruments are now smart digital instruments. HART is widely used in process and instrumentation systems, such as smart HART pressure transmitters.

What is the HART protocol?

The full name of HART protocol is Highway Addressable Remote Transducer Protocol. This open standard for fieldbus communication was introduced by Fisher-Rosemount in the 1980s.

In order to solve the communication problem between industrial field intelligent instruments and control systems. The FSK (Frequency Shift Keying) frequency shift keying signal based on the Bell202 standard is used to superimpose an audio digital signal with an amplitude of 0.5mA on the traditional 4-20mA analog signal for two-way digital communication.

HART communication will not interfere with the analog signal transmitted to the control system. It ensures compatibility with existing analog systems. It is a transitional product in the process of transforming from analog systems to digital systems.

Benefits of HART protocol

Compatibility: HART protocol can be used to connect all types of field instruments, including temperature, liquid level, pressure, flow, analyzer, etc.

Reliability: HART protocol has full-duplex communication capability. The device can send and receive at the same time, ensuring the reliability of communication.

Ease of use: HART protocol can be transmitted through the existing 4-20mA signal. No additional hardware and cables are required, which is easy to use.

Working principle of HART protocol

HART protocol usually uses 4-20mA signal for two types of communication: analog signal and digital signal.

In analog signal, 4mA corresponds to the minimum value of instrument signal. 20mA corresponds to the maximum value of instrument signal.

In digital signal, the device can send digital instructions to the instrument. The instrument can also send complete measurement data and fault diagnosis information.

Digital signals can be separated and analyzed through HART system, which improves the performance of the system and reduces the cost of field instruments.

Application examples of HART protocol

Equipment adjustment: Through HART protocol, the parameters of field instruments can be adjusted remotely to achieve rapid adjustment of equipment.
Fault detection and diagnosis: HART protocol allows equipment to obtain the measurement data and fault diagnosis information of the instrument, which helps to find and solve equipment faults in time.
Valve control: According to the measurement data, the state of the inlet (outlet) valve can be controlled through HART protocol to achieve precise flow control.

If this article still can not explain the HART PROTOCOL for you, you can learn more about Highway Addressable Remote Transducer Protocol

HART protocol specification

As an open, compatible, stable and reliable communication protocol, HART protocol has been widely recognized and applied in the industrial field.

After decades of continuous evolution, multiple versions have been updated and improved. Each revision brings new technologies and functions while being compatible with previous versions to meet the ever-changing development needs of industrial automation.

The main functions and differences of the current mainstream versions HART 5, HART 6 and HART 7 are as follows:

①Protocols before HART 5:
Physical layer: RS485;
Link layer: Token master-slave question and answer mode;
Application layer: define some simple general commands.

②HART 5 version protocol:
Physical layer: analog current + FSK, 1200bps;
Link layer: token master-slave question and answer mode, adding a second master device and a slave device burst mode;
Application layer: further enriches general commands, ordinary commands, special commands, and short address range 0 to 15.

③HART 6 version protocol:
Physical layer: Added current C8PSK, 9600bps specification;
Application layer: Expanded command content, used extended user identification, added device cluster command, short address range 0~63.

④HART 7 version protocol:
Physical layer: Added 2.4G DSSS O-QPSK 10dBm 250kbps specification;
Link layer: Added time division multiple access (TDMA) link control mode;
Network layer: Added self-organization, multipath, mesh network specifications;
Application layer: Expanded device cluster command, added mesh network maintenance command.

Version	5	6	7
Analog loop check	√	√	√
Tag (8 characters)	√	√	√
Device calibration	√	√	√
Device configuration	√	√	√
Broadcast message (burst)	√	√	√
Multivariable communication (4)	√	√	√
Primary variable with status	√	√	√
Device status	√	√	√
Long tag (32 characters)		√	√
Locate device		√	√
Digital loop check		√	√
HART software lock		√	√
Multivariable status		√	√
Wireless			√
Extended manufacturer ID			√
Time stamp			√
Trending			√
Synchronous sampling			√
Enhanced broadcast message – exception reporting			√
Enhanced broadcast message – event notification			√

Featured HART Communicators and Smart Meters

**Emerson AMS TREX Device Communicator**

**Differential pressure(DP) level transmitter**

hART protocol vs modbus

Modbus protocol and HART protocol are two different industrial communication protocols, which have the following differences:

Modbus protocol is a request/response protocol. That is, a master device can send request information or write data to multiple slave devices. The slave device will reply or execute only when it receives the request from the master device. HART protocol is a hybrid protocol that combines analog and data signals. That is, a digital signal is superimposed on the 4-20mA analog signal to achieve two-way data transmission and remote control.

Modbus protocol supports multiple physical layers and transmission modes, such as RS232/RS485/RS422, TCP/IP, wireless, etc. HART protocol mainly uses RS485 physical layer, and can also use wireless physical layer, but does not support TCP/IP transmission mode.

Modbus protocol can transmit multiple variables and information. The data type is limited and the number of nodes is limited. HART protocol can only transmit one primary variable and some secondary variables, device status and configuration data, with rich data types and unlimited number of nodes.

Modbus protocol is an open, compatible, flexible, easy-to-use protocol with no security guarantee. The HART protocol is an open, compatible, stable and reliable protocol with certain security guarantees.

SMT3151 TGP Gauge Pressure Transmitter/Transducer

Posted on May 23, 2019 by KimGuo11

What is a gauge pressure transmitter?

Gauge Pressure Transmitter/Transducer is a commonly used pressure measurement process instrument in industry. The gauge pressure transmitter measures the pressure signal at the reference end of atmospheric pressure.

An industrial gauge pressure transmitter is commonly used to monitor the process pressure of liquid, gas, steam, etc.

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

More Pressure Transmitters

Benefits of Gauge Pressure Transmitter

High accuracy: The pressure transmitter can perform high-accuracy measurements within the measurement range of 0~60MPa.
Excellent overpressure performance: Can withstand 2 times the pressure range.
Intelligent static pressure compensation and temperature compensation protect the transmitter from the influence of temperature, static pressure and overpressure, reducing errors.
LCD digital display with backlight
Built-in three-button quick operation and local adjustment function
Various anti-corrosion materials are available
Multi-faceted self-diagnosis function
Optional signals 0-10V, 4-20mA, RS485, HART protocol, etc.

Read more about: Common Units Of Pressure

Specifications of Gauge Pressure Transmitter

Use object:	Liquid, gas or steam
Measuring range	0-3.5～35kPa 0-10～100kPa 0-35～350kPa 0-0.1～1.0MPa 0-0.35～3.5MPa 0-1.0～10MPa 0-2.1～21MPa 0- 4.1～41Mpa 0- 6.0～60MPa
Output signal:	4-20mAdc. Output, superimposed HART protocol digital signal (two-wire system)
Power source:	External power supply 24V dc. Power supply range 12V ~ 45V
Installation in dangerous places	Flameproof ExdIIBT5Gb; (explosion-proof certificate no. :CE16.1163) Intrinsically safe ExiaIICT4/T5/T6Ga; （explosion-proof certificate no. : CE15.2354X）
Accuracy:	±0.1%, ±0.075%
Stability:	±0.2%/12 months of the maximum range
Temperature effect：	Including zero and range for maximum temperature error of ±0.2% / 20 ℃
Power supply impact:	Less than 0.005% / V of the output range.
Vibration effect:	In any axial direction, the frequency is 200Hz, and the error is ±0.05% / g of the maximum range.
Electronic circuit board work in:	– 40 ~ 85 ℃;
Sensitive components work in :	– 40 ~ 85 ℃;
Storage temperature :	– 40 ~ 85 ℃;
With digital display:	– 25 ~ 75 ℃ (run); – 40 ~ 85 ℃ (no damage);
Relative humidity:	0 ~ 95%
Overpressure limit:	2~5 times the maximum range of the pressure transmitter is not damaged.
Volume change:	Less than 0.16cm3
Damping:	The time constant is adjustable from 0.1 to 32.0s.
Startup time:	3s, no preheating required.

**Flush membrane pressure connection interface**

Extended reading: How to calibrate HART pressure transmitters

Common Industrial Applications of Gauge Pressure Transmitter

Gauge pressure transmitter is the most commonly used detection instrument in industrial process control, which is widely used in various automatic control systems. Such as aerospace, military industry, petrochemical, chemical industry, oil well, electricity, shipbuilding, building materials, pipelines and many other industries.

It is generally used to measure pressure or absolute pressure in environments where the medium temperature is not too high, the corrosiveness is not strong, the viscosity is not high, and it is not easy to crystallize.

If low temperature, high temperature, corrosive medium measurement is required. Please contact our engineers for customization!

Mechanical and plant engineering
Chemical industry
Medical technology
Food and beverage
Oil and gas industry
Packaging and paper industry
Pharmaceutical industry

Explosion Proof Pressure Transmitter for Hazardous locations

Gauge pressure transmitter working principle

SMT3151 TGP-Gauge Pressure Transmitter / Transducer is a diffusion silicon pressure transmitter. The working principle of the diffused silicon pressure sensor is based on the piezoresistive effect.

Using the principle of piezoresistive effect, the pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramic).

Make the diaphragm produce a slight displacement proportional to the pressure of the medium. To change the resistance value of the sensor. Use electronic circuits to detect this change. And convert and output a standard measurement signal corresponding to this pressure.

More about : Pressure transmitter Working Principle.

Difference between absolute, gauge, and differential pressure

Comparison of absolute, gauge and differential pressure

Absolute pressure

Absolute pressure is referred to as the vacuum of free space (zero pressure). In practice, absolute piezoresistive pressure sensors, measure the pressure relative to a high vacuum reference, sealed behind its sensing diaphragm.

The vacuum has to be negligible compared to the pressure to be measured. Sino-Instrument’s absolute pressure sensors, offer ranges from 1 bar or even 700 mbar as well as barometric pressure ranges.

Gauge pressure

Gauge pressure is measured relative to the ambient atmospheric. The average atmospheric at sea level is 1013.25 mbar. Changes of the atmospheric, due to weather conditions, or altitude influences the output of a gauge pressure sensor.

A gauge pressure higher than ambient pressure is referred to as positive pressure. If the measured pressure is below atmospheric, it is called negative or vacuum gauge pressure. In general, a vacuum is a volume of space that is essentially empty of matter.

According to its quality vacuum is divided into different ranges such as an e.g. low, high and ultra high vacuum.

Differential pressure

Differential pressure is the difference between any two process pressures p1 and p2. Differential pressure sensors must offer two separate pressure ports, with a tube or thread. Sino-Instrument’s amplified pressure sensors, are able to measure positive and negative pressure differences. i.e. p1>p2 and p1<p2.

These sensors are called bidirectional differential pressure sensors, with ranges of e.g. -1…+1.0 bar or -2.5…+2.5 mbar. In contrast, unidirectional differential pressure sensor only operate in the positive range (p1>p2). E.g. from 0…1.0 bar or 0…2.5 mbar. And the higher has to be applied to the pressure port defined as “high pressure”.

Gauge Pressure VS Absolute Pressure

Gauge pressure refers to pipeline pressure. It refers to the pressure measured with pressure gauges, vacuum gauges, U-shaped tubes and other instruments, also called relative pressure). “Gauge pressure” starts from atmospheric pressure.
The pressure directly acting on the surface of the container or object is called “absolute pressure”. The absolute pressure value starts with absolute vacuum.
Absolute pressure actually refers to the gauge pressure plus the local atmospheric pressure (generally a standard atmospheric pressure can be 101.3Kpa).

Absolute pressure = gauge pressure + one atmosphere
If the unit is MPa, absolute pressure = gauge pressure + 0.1MPa

Transmitters can convert physical signals into electrical signals.
For example, our pressure transmitter can convert pressure signals into 4-20mA. Liquid level transmitter can convert liquid level signals into 4-20mA.

Gauges are generally mechanical. There is no output of electrical signals. For example, pressure gauges and liquid level gauges. The measurement results can be measured and read intuitively.

When selecting a pressure transmitter, the concept of pressure type is involved: absolute pressure, gauge pressure, negative pressure and differential pressure.

Absolute pressure transmitter measures the absolute pressure of the medium in the equipment. Its reference pressure is an absolute value of 0. It has nothing to do with atmospheric pressure. Therefore, there will be a vacuum sealed cavity on the low-pressure side of the pressure core.

Gauge pressure transmitter measures the pressure based on atmospheric pressure. One side of the pressure transmitter is connected to the atmosphere, and the other side is connected to the measured pressure, so the reference pressure side is open to the atmosphere. It is generally used to measure the liquid level of pipelines and non-pressure tanks.

If you pay close attention to the outer shell of some gauge pressure transmitters, it is not difficult to find some small holes on it. These vents are reserved to keep the reference side connected to the atmosphere.

More Featured Pressure Transmitters and Pressure Measurement Solutions

We at Sino-Inst manufacture and supply various types of gauge pressure transmitters for various industries. Customized production is available based on your measurement requirements, including pressure range, temperature, accuracy, signal output, mounting thread, material, etc.

If you need to purchase a gauge pressure transmitter, or have any technical questions, please feel free to contact us.

Request a Quote

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KimGuo11

drurylandetheatre.com

HART 375 Field Communicator

Posted on May 23, 2019 by KimGuo11

HART 375 Field Communicator is a handheld communicator that supports HART protocol devices. It can configure, manage and maintain all devices that comply with the HART protocol.

This intelligent handheld operator can communicate with 11513351, 3851, 1851, 3051, EJA and other HART protocol instruments. It is fully compatible with various intelligent pressure transmitters produced in China.

RFQ

Features of HART 375 Field Communicator

Easy operation: Large display screen (4 lines, 18 characters per line);
Online monitoring and communication: During communication, the modulated signal will not interrupt the 4~20mA DC signal;
Can be used with instruments using the HART communication protocol: Used with all instruments using the HART communication protocol;
Information self-diagnosis/protection function: self-check function, formatting password protection, low voltage alarm display;

Applications

Fully supports all standard HART communications;
Siemens intelligent pressure transmitter;
Lanlian LSⅢ intelligent pressure transmitter;
3051 intelligent pressure transmitter;
1151, 3151 intelligent pressure transmitter;
Fairbus CDS-3151 intelligent pressure transmitter;
Yokogawa EJA intelligent pressure transmitter (supports new version)
Russian METRAN-49, 100 intelligent pressure transmitter
Rosemount 1151, 3051 intelligent pressure transmitter (supports new version)

Function

HART intelligent devices can be tested, diagnosed and inspected in production;
HART intelligent devices can be configured, calibrated, diagnosed, maintained and monitored during field operation;
Obtain manufacturer information of HART instruments on site;
Understand the working status and fault information of HART instruments;
Read the output current and process variables of the instrument;
Obtain parameters and output values of related sensors;

Specifications of 375 HART Communicator

Microprocessor:	80MHZ
RAM:	32M
Built-in memory:	32M
System card:	128M or higher
Expansion module:	32M
Protection:	IP51 (front)
Working environment:	-10～50 degrees Celsius
Anti-vibration:	1m landing on concrete floor is no problem
Weight:	0.9KG, including battery
Humidity:	0～95% (no condensation)
Display:	1/4VGA (240*320 pixels)
Storage:	-20～55 degrees Celsius (with battery) -20～60 degrees Celsius (without battery)
Keyboard:	25 keys, 4 operation keys, 12 letter keys, 4 shoulders, 4 function keys and power key
Battery:	Rechargeable NiMH battery, can be used for 10 hours, 85～240vac charging
Dimensions:	228mm×98mm×60mm

Working Principle of HART 375 communicator

HART 375 Field Communicator is a portable terminal that is used with instruments that use the HART communication protocol to set, change and display them. It can monitor input/output values and self-diagnosis results. Set constant current output and zero adjustment.

When the system is started or maintained, just connect the HART375 HART communicator to the 4~20mA communication signal line and it can be used.

With the Video below, you will know more about: The Working Principle of HART 375 communicator, and what is HART Protocol?

HART 375 Field Communicator Vs HART 475 Field Communicator

Rosemount HART375 and HART475 handheld operators have been discontinued. Sino-Inst’s HART375 and HART475 are affordable.

Functional difference

The range of supported products is different. In fact, the functions and supported range of HART375 and HART475 are similar. In terms of function, the HART protocol library of 475 is continuously upgraded, so it supports the widest range of products.

Speed difference

It is reflected in the convenience of operation. The data operation processor of HART475 is much faster than that of HART375.

Read More about: HART475 Field Communicator

Now, Emerson stopped all the services of the 375.
You can consider buying a new version-Emerson AMS TREX Device Communicator.

Our 375 Communicator is suitable for most transmitters with HART protocol. For example:

**Diffused silicon Gauge Pressure Transmitter**

**Capacitive Gauge Pressure Transmitter**

**Explosion-proof Pressure Transmitter**

**High-Temperature Pressure Transmitter**

If you need the datasheet, price, or more information about HART 375 Field Communicator,

Just Contact Us.

Sino-Inst offers over 100 Level Sensors (like the ultrasonic level transmitter), pressure transducers (like the Low-Pressure Transducer, capacitive pressure transducer), Flowmeters ( like the Portable Ultrasonic Flowmeter, Magnetic flow meters ).

About 50% of these are Submersible Level Sensors, 40% are water Sanitary Pressure Transmitter, and 40% are 4-20mA/ Voltage Pressure Transducer . A wide variety of Industrial Pressure Transmitters options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of wireless pressure transmitters instrumentation, located in China. We sells through a mature distribution network that reaches all 50 states and 30 countries worldwide.

HART 375 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

KimGuo11

drurylandetheatre.com

HART475 Field Communicator

Posted on May 22, 2019 by KimGuo11

RFQ

The HART475 Field Communicator is a handheld communicator that supports HART protocol devices. It is mainly used for configuring, managing, maintaining, adjusting HART intelligent instruments in industrial sites and monitoring instruments during operation.

The HART475 Field Communicator can communicate with 1151, 3051, EJA, ABB, and other HART protocol instruments. It is fully compatible with various intelligent pressure (temperature) transmitters, and can also communicate with electromagnetic flowmeters, V-cone flowmeters, target flowmeters, vortex flowmeters, and other flowmeters that support HART protocol.

Features of HART475 Field Communicator

During online monitoring and communication, the modulated signal will not interrupt the 4~20mA DC signal;
The HART communicator can be shared with instruments using HART communication protocol and can be used with all instruments using HART communication protocol;
Easy to operate Large display screen, users can see at a glance, easy to set and change;
Information self-diagnosis/protection function;
Full-featured communication: communication supports flow meters, temperature meters, and transmitters carrying HART protocol;
Large-screen display: the display interface is larger and clearer, using LCD screen;
Production testing, diagnosis and inspection of HART smart devices;
It can configure, calibrate, diagnose, maintain and monitor HART intelligent equipment in field operation;
Obtain the manufacturer information of the field HART instrument;
Understand the working status and fault information of the HART instrument;
Read the output current and process variables of the instrument;
Obtain the parameters and output values of related sensors;
Self-checking function;
format password protection;
Low voltage alarm display;
Standard technical specifications;

What’s in the Box

The device is equipped with:
A manual operator
A Battery
A Pack
A charger
A communication cable
A 250-ohm resistor

Configuration parameters

Product name:	HART475 English Communicator (Field Communicator)
Protocol version:	HART475
Compatible Versions:	HART275/HART375/HART475
Communication object:	It can communicate with 1151,3051, EJA, ABB, and HART protocol imported instruments in terms of flow and various smart transmitters made in China with HART protocol
Accuracy class:	0.05%F.S
Battery storage:	-20~50℃
Operating temperature:	-10~50℃
Relative humidity:	0~95%RH (no condensation)
Product Weight:	0.48Kg
Dimensions:	23013045mm
Power supply:	Built-in rechargeable battery
Packing:	With carrying case
Accessories:	Charger,test lead,alligator clip,2500 resistor

More Featured Products can work with HART Communicators:

**Remote Seal Differential Pressure Transmitter**

**ULT-100 Explosion-proofUltrasonic Level Indicator**

**Low temperature Turbine Flowmeter-Liquid Nitrogen Flow Meter**

Now, Emerson stopped all the services of the 375. You can consider buying a new version-Emerson AMS TREX Device Communicator.

If you need the datasheet, price, or more information about HART 375 Field Communicator,

Just Contact Us.

Sino-Inst offers over 100 Level Sensors (like the ultrasonic level transmitter), pressure transducers (like the Low-Pressure Transducer ), and Flowmeters (like the verabar and annular).

About 50% of these are Submersible Level Sensors, 40% are water Sanitary Pressure Transmitters, and 40% are 4-20mA/ Voltage Pressure Transducer.

A wide variety of Industrial Pressure Transmitters options are available to you, such as free samples, and paid samples.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. HART475 Field Communicators are most popular in the 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

KimGuo11

drurylandetheatre.com

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