Category Archives: Pressure

Pressure Transducers and Transmitters Manfacturer, China

 
A pressure transducer also called a pressure transmitter,
is a transducer that converts pressure into an analog electrical signal.
Pressure transmitters are used to measure the pressure,
or level of industrial liquids and gases.
The output is transmitted to a control system.
Accurate and stable process measurements ensure the safe,
reliable, and profitable operation of your plant.
Sino-Instrument is pressure transmitters manufacturer in China.
We offer all types of pressure transmitters.
Like Direct Mounted, flange-mounted, single flange,
double flange, Remote Diaphragm Seals, High Static, Digital Remote.
Most of our pressure transmitters are used in oil, liquids,
and other process variables.
Pressure transducers are generally available with three types of electrical output;
millivolt, amplified voltage, and 4-20mA.

4-20 mA Output Pressure Transducers

These types of transducers are also known as pressure transmitters,
work with HART communicators.
Since a 4-20mA signal is least affected by electrical noise,
and resistance in the signal wires,
these transducers are best used when the signal must be transmitted long distances.
It is not uncommon to use these transducers in applications where the lead wire must be 1000 feet or more.
Choose the right pressure transducer for your application:

Stainless Steel Pressure Switch PC-300

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Stainless steel pressure switch stainless steel material, compact structure. Can be widely used in water, oil, gas pressure measurement.

Stainless Steel Pressure Switch PC-300

Stainless steel pressure switch uses internationally advanced stainless steel pressure diaphragm. All stainless steel color, compact appearance, easy installation and use, high and low pressure integrated design. It can control the pressure of the high pressure end and low pressure end of the system at the same time. The product is waterproof and moisture-proof.

Sino-Inst offers a variety of Pressure Switches for pressure control. If you have any questions, please contact our sales engineers.

Request a Quote
More Pressure Switches

Specifications of Stainless Steel Pressure Switch

Output signal:Switch signal
Working pressure (high position) range:-14.5～2200PSI
Reset pressure (low position) range:-12～2180PSI
Working pressure deviation:± 3～30PSI
Ambient temperature:-40～85℃
Medium temperature:-40～125℃
Electrical load:220VAC ,56/60Hz，3A
Working life:≥100,000 Cycles

Pressure Switch Types

According to different classification standards, we can classify pressure switches as follows.

  • According to the sensing element can be divided into:
    • Coil spring tube pressure switch, diaphragm pressure switch, bellows pressure switch, bellows pressure switch, etc.
  • According to the nature, it can be divided into:
    • Mechanical and electronic smart pressure switches.
  • According to the set value, it can be divided into:
    • Adjustable pressure switch and non-adjustable pressure switch.
  • According to the application, it can be divided into:
    • General pressure switches, small pressure switches, smart pressure switches, explosion-proof pressure switches, marine pressure switches, differential pressure switches, etc.

Guess You’ll Like: Explosion Proof Pressure Transmitter

Common types of pressure switches

Miniature Pressure Switch

Miniature pressure switch PC-100 has a long working life (more than 100,000 times) and excellent shock resistance. It can be used to monitor liquid or gas pressure.

Manual Reset Pressure Switch

Manual Reset Pressure Switch uses international advanced stainless steel pressure diaphragm with high accuracy. Small size, easy installation and use, high and low pressure integrated design. It can simultaneously control the pressure of the high pressure end and the low pressure end of the system. Manual reset, suitable for semi-automatic operation occasions.

Stainless steel differential pressure switch

The differential pressure switch is made of stainless steel, which can be dirt-resistant, corrosion-resistant, clean and hygienic.

Differential pressure controller, also called differential pressure switch, differential pressure switch, differential pressure controller. It can also be used for cut-off protection of water pumps and filters. It can also be called: differential pressure type water flow switch, differential pressure type flow switch.

The adjustable differential pressure switch can provide a very wide range of adjustable differential pressure settings. It adopts stable micro switch and sensitive diaphragm to achieve the excellent advantages of high precision and low dead zone.

The adjustable differential pressure switch controller is developed for applications that are used in small quantities and have different requirements for differential pressure. It is usually used in engineering to detect the pressure difference of water filters, pumps, heat exchangers, chillers and coils.

When the water flow (pressure difference) in the system rises or falls to the set value. Output an alarm or cut-off function alarm to provide to the automatic control system. It can also be used to indicate the status of a pump or filter.

The differential pressure switch is composed of two diaphragm cavities. And the two into diaphragm and bellows type, And their performance characteristics are also differentsitive diaphragm. High pressure and low pressure enter the high pressure cavity and low pressure cavity of the differential pressure switch respectively. And the differential pressure felt deforms the pressure sensitive diaphragm. Through mechanical structures such as railing springs. Finally, the uppermost micro switch is activated to output the electrical signal.

Different pressure-sensitive components of differential pressure switches are divided into diaphragm and bellows type. And their performance characteristics are also different.

Differential pressure switches are composed of pressure-sensitive components, have different principles, and have different performances. The diaphragm type can be made into high static pressure and low differential pressure, while the bellows itself has low pressure resistance.

Stainless steel digital pressure switch

Stainless steel digital pressure switch, an economical digital pressure switch integrating pressure measurement, display and control. This series of pressure switches can be set with two normally open and normally closed alarm points, and can also achieve two high and low pressure controls. In addition, it has a key to zero, three display units switching and other functions.

The operation method of this pressure switch is simple and intuitive, just set the action point and hysteresis according to the manual, and the hysteresis of the two sets of relays can be set independently. According to the customer site, only one group of control can be used, or both groups can be used.

Stainless steel digital pressure switch

Stainless steel digital pressure switch, an economical digital pressure switch integrating pressure measurement, display and control. This series of pressure switches can be set with two normally open and normally closed alarm points, and can also achieve two high and low pressure controls. In addition, it has a key to zero, three display units switching and other functions.

The operation method of this pressure switch is simple and intuitive, just set the action point and hysteresis according to the manual, and the hysteresis of the two sets of relays can be set independently. According to the customer site, only one group of control can be used, or both groups can be used.

All products adopt food-grade 304 stainless steel joints and 304 stainless steel housings, providing different installation methods in axial and radial directions.

Weatherproof pressure switch

The degree of protection of the fully welded stainless steel shell is designed to reach IP67

General considerations for IP65 and IP67 protection levels:

In order to clarify the “secrets” of these two types of protection, this article will give a technical description: refer to IEC 60529. The first characteristic number specifies “prevention of solid foreign objects”. The second characteristic number specifies “prevention of water entry”.

Weatherproof pressure switch

The degree of protection of the fully welded stainless steel shell is designed to reach IP67

General considerations for IP65 and IP67 protection levels:

In order to clarify the “secrets” of these two types of protection, this article will give a technical description: refer to IEC 60529. The first characteristic number specifies “prevention of solid foreign objects”. The second characteristic number specifies “prevention of water entry”.

Different protection levels can provide different types of protection:
“Dustproof” equipment (IP6x) to prevent “water jet” (IPx5) and “short immersion” (IPx7).
Not all immersion-proof instruments can withstand water jets, and vice versa, and not every instrument that is water-proof jets can be immersed.
In some applications this is a small but extremely important difference.

Stainless steel well pressure switch

A well water pressure switch helps to control a well pump system which helps provide water to a household or business. The pressure switch has a spring on the inside that’s connected to electrical contacts. As time goes on, the spring becomes weak and the electrical contacts wear out which can make it seem that your pump isn’t working quite right.
It is used with submersible well pumps and jet pumps.

Pressure switch for water

The water pressure switch, as the name implies, uses water pressure to control the switch.

When the water pressure switch is in use, a fixed value is generally set. That is to say, when the actual value is less than this fixed value or greater than this fixed value, it will give an alarm. And it moves to cause it to be connected to another connecting rod to switch Power on or off.

When the water pressure in the system reaches a fixed value, it returns to its original state, which acts as a switch.

Extended reading: Miniature Pressure Switch

Air pressure switch

The air pressure switch can be used to control the positive pressure, negative pressure and differential pressure of air, flue gas and other non-flammable gases. Especially in the case of differential pressure control, a small pressure difference can be monitored to achieve precise differential pressure control.

Air pressure switches mainly include two types of normally closed and normally open. The main feature is the use of inch pipe threaded quick coupling or copper pipe welding type installation structure. The installation procedure is flexible, convenient to use, and no special fixed installation is required.

The main application areas are the high and low pressure protection control of household, commercial and automobile refrigeration systems, steam conditions and power stations and other heavy industry areas.

Read more about: Gas Pressure Transducer-Sensor for Gas Pressure Meaurement

You may like:

Sino-Inst offers over 50 Stainless Steel Pressure Switches for pressure measurement. About 50% of these are liquid pressure swithces, 40% is gas pressure switches.

A wide variety of Stainless Steel Pressure Switches options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Stainless Steel Pressure Switch instrumentation, located in China.

Manual Reset Pressure Switch PC-200

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Manual Reset Pressure Switch is suitable for semi-automatic operation. Control high pressure end and the low pressure end of the system at the same time.

Manual Reset Pressure Switch uses international advanced stainless steel pressure diaphragm with high accuracy. Small size, easy installation and use, high and low pressure integrated design. It can simultaneously control the pressure of the high pressure end and the low pressure end of the system. Manual reset, suitable for semi-automatic operation occasions.

Sino-Inst offers a variety of Pressure Switches for pressure control. If you have any questions, please contact our sales engineers.

Request a Quote
More Pressure Switches

Features of Manual Reset Pressure Switch

  1. Manually push the reset switch to meet special working conditions
  2. Working pressure can be manufactured according to user requirements (30-800PSI)
  3. Using laser welding process equipment, excellent sealing performance
  4. The contacts are all silver-plated, and the special products are silver contacts (industrial grade), which are stable and reliable.
  5. Long working life of switch electrical contacts (more than 100,000 times), excellent shock resistance

Specifications of Manual Reset Pressure Switch

Output signal: switch signal
Working pressure (high position) range: 30～800PSI
Reset pressure (low position) Range: 10～700PSI
Working pressure deviation: ±3～30PSI
Ambient temperature: -40～85℃
Medium temperature: -40～125℃
Electrical load: 220VAC, 56/60Hz, 3A
Working life: ≥100,000 Cycles

PC200 series manual reset pressure switch model list:

ModelThread size/length
(mm)		Dimensions
(mm)		Electrical connectionsSwitch Type
Normally closed (A)/normally open B
/C (normally open + normally closed)		Action pressure
(PSI)		Reset pressure
(PSI)
PC 201Inner 7/16-20UNFΦ23×53Direct outSingle Pole Single Throw A30～80010～700
PC 202Inner 7/16-20UNFΦ23×53Direct outSingle Pole Double Throw C30～80010～700
PC 2031/4NPT /13Φ23×59Direct outSingle Pole Single Throw A30～80010～700
PC 2041/4NPT /13Φ23×59Direct outSingle Pole Double Throw C30～80010～700
PC 205Φ6 trachea/72Φ28×108TerminalSingle Pole Single Throw A30～80010～700
PC 206Φ14 trachea x21Φ23×60Direct outSingle Pole Double Throw C30～80010～700
PC 207Inner 7/16-20UNFΦ24×53Direct outSingle Pole Single Throw A30～80010～700
PC 208Inner 7/16-20UNFΦ24×53Direct outSingle Pole Single Throw A30～80010～700

Manual Reset High Pressure Switch

The controller adopts a piston type sensor, which is divided into three types: with a drain port, a non-leak piston and a combination of a piston type and a diaphragm type.

It can be used for compressed air containing oil mist and other gas containing oil mist that has no corrosive effect on the pressure sensor material, hydraulic oil, water-oil emulsion and neutral liquid medium with good lubricating performance.

The setting value of the controller is adjustable, and its adjustment range is 0.3-40MPa.

Extended reading: Miniature Pressure Switch

How does a pressure switch work?

The force switch is a simple pressure control device. When the measured pressure reaches the rated value, the pressure switch can send out an alarm or control signal.  

The working principle of the pressure switch is: when the measured pressure exceeds the rated value, the free end of the elastic element is displaced, and the switch element is pushed directly or after comparison to change the on-off state of the switch element to achieve the purpose of controlling the measured pressure.  

The elastic elements used in the pressure switch include a single-turn spring tube, diaphragm, bellows and bellows.    

Switching elements include magnetic switches, mercury switches, micro switches, etc.    

There are two types of pressure switches: normally open and normally closed.

Extended Reading: Electronic Pressure Switch for Air Compressor

How do you test a pressure switch?

Calibration method of pressure switch:

  1. Find out the action setting value of the tested instrument according to the specification.
  2. Select an appropriate pressure signal source to pressurize the test meter. A standard pressure gauge with an appropriate range detects the signal pressure. Use a multimeter to measure the on and off states of the contacts.
  3. For the high report switch, slowly increase the pressure from low to high, and observe the multimeter. When the multimeter indicates a sudden change, the evaluation of the standard pressure gauge is the high reported value.
    Then slowly lower the pressure. When the multimeter indicates a sudden change again, the evaluation of the standard pressure gauge is the reset value.
  4. For the under-report switch, the test pressure should be increased above the set value first, and then slowly decreased.
    When the multimeter indicates a sudden change, the evaluation of the standard pressure gauge is a low value.
    Press again slowly, and when the multimeter indicates a sudden change again, the indication value of the standard pressure gauge is the reset value.

Miniature Pressure Switch PC-100

Miniature pressure switch is also called compact pressure switch, or micro pressure controller. Designed specifically for OEM applications. A variety of threads are available.

You may like:

Sino-Inst offers over 50 Manual Reset Pressure Switches for pressure measurement. About 50% of these are liquid pressure swithces, 40% is gas pressure switches.

A wide variety of Manual Reset Pressure Switches options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Manual Reset Pressure Switch instrumentation, located in China.

Miniature Pressure Switch PC-100

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The miniature pressure switch is also called compact pressure switch, or micro pressure controller. Designed specifically for OEM applications. A variety of threads are available.

Miniature pressure switch PC-100 has a long working life (more than 100,000 times) and excellent shock resistance. It can be used to monitor liquid or gas pressure.

Sino-Inst offers a variety of Pressure Switches for pressure control. If you have any questions, please contact our sales engineers.

Request a Quote
More Pressure Switches

Features of Miniature Pressure Switch PC-100

  • Use internationally advanced stainless steel pressure diaphragm (stainless steel bellows). Laser welding process equipment. Exquisite workmanship and high precision.
  • Small size, easy installation and use, high and low pressure integrated design. It can simultaneously control the pressure of the high pressure end and low pressure end of the system.
  • The electrical contacts of the switch have a long working life (more than 100,000 times). Excellent shock resistance.
  • Small and exquisite appearance, easy to install and use.
  • The working pressure can be manufactured according to user requirements (-14.5-800PSI).
  • Using laser welding process equipment, excellent sealing performance.
  • The contacts are all silver-plated, and the special products are silver contacts (industrial grade), which are stable and reliable.

Specifications of Miniature Pressure Switch

Output signal: switch signal
Working pressure (high position) range: -14.5～800PSI
Reset pressure (low position) range: -12～780PSI
Working pressure deviation: ± 3～30PSI
Ambient temperature: -40～85℃
Medium temperature: -40～125℃
Load power supply: 220VAC, 56/60Hz, 6A
Working life: ≥100,000 Cycles

Read more about: Gas Pressure Transducer-Sensor for Gas Pressure Meaurement

If users have special requirements, they can be customized according to the provided samples, drawings, technical parameters, etc.

PC100 series miniature pressure switch model table according to our company’s respective parameter standards when ordering.

ModelThread size/length
(mm)		Dimensions
(mm)		Electrical connectionsSwitch type
Normally closed (A)/normally open B
/C (normally open + normally closed)		Action pressure
(PSI)		Reset pressure
(PSI)
PC 101Inner 7/16-20UNFΦ22×39TerminalSingle pole single throw A/B-14.5～800-12～780
PC 102Inner 7/16-20UNFΦ22×45Direct outSingle pole single throw A/B-14.5～800-12～780
PC 103Φ6 trachea/72Φ22×94TerminalSingle pole single throw A/B-14.5～800-12～780
PC 104Φ6 trachea/72Φ22×100Direct outSingle pole single throw A/B-14.5～800-12～780
PC 105Φ6 trachea/72Φ22×94TerminalSingle pole single throw A/B-14.5～800-12～780
PC 106Φ12 trachea/21Φ22×43TerminalSingle pole single throw A/B-14.5～80-12～75
PC 107G1/4-19BSP/13Φ22×45TerminalSingle pole single throw A/B-14.5～800-12～780
PC 108G1/4-19BSP/13Φ22×51Direct outSingle pole single throw A/B-14.5～800-12～780
PC 1091/4-18NPT/13Φ22×45TerminalSingle pole single throw A/B-14.5～800-12～780
PC 1101/4-18NPT/13Φ22×51Direct outSingle pole single throw A/B-14.5～800-12～780
PC 111G1/8-28BSP/10Φ22×51TerminalSingle pole single throw A/B-14.5～800-12～780
PC 112G1/8-28BSP/10Φ22×51Direct outSingle pole single throw A/B-14.5～800-12～780
PC 1131/8-27NPT/10Φ22×45TerminalSingle pole single throw A/B-14.5～800-12～780
PC 1141/8-27NPT/10Φ22×51Direct outSingle pole single throw A/B-14.5～800-12～780
PC 1153/8-24UNF/7Φ22×34TerminalSingle pole single throw A/B-14.5～300-12～180
PC 1163/8-24UNF/7Φ22×48Direct outSingle pole single throw A/B-14.5～300-12～180
PC 117M10x1/11Φ22×46TerminalSingle pole single throw A/B-14.5～300-12～180
PC 118M10x1.5/11Φ22×46TerminalSingle pole single throw A/B-14.5～800-12～780
PC 119M8x1/8Φ22×42TerminalSingle pole single throw A/B-14.5～300-12～180
PC 120G1/4 /13Φ24×46TerminalSingle Pole Double Throw C-14.5～800-12～780
PC 1211/4-18NPT/13Φ22×46TerminalSingle Pole Double Throw C-14.5～800-12～780
PC 122M12x1.25 cone/13Φ22×45TerminalSingle pole single throw A/B-14.5～800-12～780
PC 123G1/4/13Φ24×61Direct outSingle Pole Double Throw C-14.5～800-12～780
PC 124G1/2/14Φ24×55TerminalSingle Pole Double Throw C-14.5～800-12～780
PC 125G1/2/14Φ24×51TerminalSingle Pole Double Throw C-14.5～800-12～780
PC 126Φ8 or Φ6 gas pipe jointΦ24×68TerminalSingle Pole Double Throw C-14.5～80-12～75
PC 127G1/2/12Φ24×55Direct outSingle pole single throw A/B-14.5～800-12～780
PC 1281/8-27NPTΦ23×45TerminalSingle Pole Double Throw C-14.5～800-12～780
PC 129Inner M11x1/6.5Φ24×55Direct outSingle pole single throw A/B-14.5～300-12～180
PC 130G1/8-28/10Φ22.5×51Direct outSingle pole single throw A/B-14.5～800-12～780
PC 1311/8-27NPT/10.5Φ28.5×64ConnectorSingle Pole Double Throw C-14.5～300-12～180
PC 132Inner M14x1/8Φ25×61Direct outSingle Pole Double Throw C-1000～200-500～150
PC 133M12x1.25 cone/13Φ24×51Direct outSingle pole single throw A/B-14.5～800-12～780
PC 134M12x1.25 cone/13Φ24×61Direct outSingle Pole Double Throw C-14.5～800-12～780

Guess You’ll Like: Explosion Proof Pressure Transmitter

Miniature Pressure Switch Applications

Mainly used for high and low-pressure protection control of the household, commercial, and automobile refrigeration systems. Steam conditions and power stations. Accumulators, receivers, flash tanks, separators, scrubbers, oil refining devices. It is also suitable for high and low-pressure protection control of various equipment and tools.  

The miniature pressure switch is mainly used on the air compressor to adjust the start and stop status of the air compressor. By adjusting the pressure in the air tank, the air compressor can be stopped and rested, which has a maintenance effect on the machine.
When the air compressor is debugged in the factory, adjust to the specified pressure according to the customer’s needs. Then set a pressure difference.

For example, the compressor starts to start and pumps air into the air storage tank. When the pressure reaches 10kg, the air compressor stops or unloads. When the pressure reaches 7kg, the air compressor starts to start again. There is a pressure difference, and this process can make The compressor takes a break. It protects the air compressor. The compressor is directly driven by the electric motor, which causes the crankshaft to rotate, and drives the connecting rod to cause the piston to reciprocate, causing the cylinder volume to change.

Due to the change of the pressure in the cylinder, the air enters the cylinder through the air filter (muffler) through the intake valve. In the compression stroke, due to the reduction of the cylinder volume, the compressed air passes through the exhaust valve. The mass flow meter is exhausted The pipe and the one-way valve (check valve) enter the gas storage tank, and when the exhaust pressure reaches the rated pressure of 0.7MPa, it is controlled by the miniature pressure switch and automatically stops.

When the pressure of the gas storage tank drops to 0.5-0.6 MPa, the pressure switch is automatically connected and activated.

You may like Industrail pressure sensors.

Miniature Adjustable Pressure Switch

PC400 adjustable stainless steel pressure switch.

This series of pressure switches are used to monitor the pressure of automatic control, lifting systems, refrigeration, grease and lubrication devices, and hydraulic, pneumatic, and water circuits.

Its design uses a hexagonal body, nitrile rubber (NBR), oil-resistant diaphragm, and normally open, normally closed and SPDT single pole double throws gold contacts.

When the pressure needs to be adjusted. After removing the protective cap fastening screw. Use a small screwdriver to rotate the V adjustment screw embedded in the color switch cover. The pressure switches operating point can be set to the required value. Be careful not to affect the spring action.

The micro pressure sensor with a nominal size of 3mm in outer diameter is specially designed for the measurement of dynamic pressure distribution in aerodynamic research and test, which requires small installation size, does not disturb the flow field, and has excellent dynamic response.

It is used in the measurement of aerodynamic performance such as engine intake port pressure distortion, surge, etc. The natural frequency of the sensitive element is >200kHz.

The pressure sensitive element of the miniature pressure sensor adopts the most advanced MEMS (Miro Electronic Mechanical Systems) technology to design and manufacture.

The three-dimensional integrated, double-sided processed silicon piezoresistive pressure sensitive element has excellent linearity accuracy, and the high uniformity of the Wheatstone strain bridge fabricated by ion implantation and fine lithography makes it have a small temperature drift. The force-sensitive structure of silicon thin film formed by bulk micromachining and precise anisotropic etching enables it to have high pressure sensitivity and radial dimensions as small as 1.5mm.

The advanced miniaturized pressure-sensitive chip adopts stress-free packaging technology, hermetically packaged in a special micro-mounting base and stainless steel capillary.

The reference pressure chamber of the absolute pressure sensor is a vacuum chamber sealed on the back of the chip. The reference pressure chamber of the gauge pressure sensor is led out from the back through a thinner stainless steel capillary to communicate with the atmosphere. In order to facilitate the user to obtain a stable pressure reference, a thin nylon tube is used to lead it to the air pressure stable place.

Flat pressure sensor may actually refer to a flat diaphragm pressure sensor, or a flat weighing load cell.

Low cost pressure sensor. At present, ceramic pressure sensors are the ones that can effectively reduce the cost of industrial pressure sensors.

Ceramic pressure sensor is a pressure sensor refined from a thick ceramic base using a refined ceramic base.

SI-338 Ceramic pressure sensor uses ceramic or diffused silicon core. All stainless steel package, small and beautiful appearance. Suitable for occasions with limited installation space. Wide range temperature compensation, high accuracy, small size, no adjustment, wide range coverage. Support OEM processing. Ceramic pressure transmitter is used in compressor, air conditioning and other pressure measurement.

Related Products

How to adjust the miniature pressure switch?

Adjust the pressure switch adjustment screw clockwise, and then slowly adjust the pressure switch counterclockwise.
The adjustment of the pressure switch is not mysterious. The switch must be positioned in the original position and tighten the positioning screw until the pressure switch contact is released and stops.

Select a pressure switch/ controller with a set value range of 0.1～1.0Mpa

Turn the pressure adjustment screw on the top right side to make the pointer point at 0.8Mpa (8kg or 8bar) on the scale, this value is the upper limit switching value.

Turn the pressure adjustment screw on the left side of the top to make the pointer indicate 0.3Mpa on the scale.
Lower limit switching value = upper limit switching value-switch pressure difference=0.8-0.3=0.5, this value is the lower limit switching value. To

Connect the wiring terminal of the controller to the controlled electrical circuit.
Please note: ①It is public wiring. ③It is normally open terminal output. ⑤It is normally closed output. High voltage protection, please connect ① ⑤, during normal boosting, ①-⑤ connected (①-③ not connected). When the pressure rises to the set upper limit, that is, at 0.8Mpa, ①-⑤ no connection (①-③ connected).
When the pressure drops, ①-③ are connected at this time, and the pressure drops to the lower limit setpoint, which is 0.3Mpa. Then switch to ①-⑤ connected (①-③ not connected). When the pressure stops and the pressure rises, it will automatically cycle.

Turn on the power and let the pressure of the controlled medium (water, gas) rise.
Please pay attention to the adjustment and make the setting value of the pressure switch consistent with the indication of the pressure gauge.
If the pressure rises to the upper limit setting, the switch has not acted yet, that is, turn the pressure adjusting screw to fine-tune to the switching action, and repeat the verification again and perform the lower limit verification, the process is the same as above.
(Verify several times) Fix the pressure adjusting screw and the differential pressure adjusting screw on the top of the iron case of the pressure switch with red paint.

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Sino-Inst offers over 50 Miniature Pressure Switches for pressure measurement. About 50% of these are liquid pressure switches, 40% are gas pressure switches.

A wide variety of Miniature Pressure Switches options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of Miniature Pressure Switch instrumentation, located in China.

Pressure Switches

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What is a Pressure Switch?

The pressure switch is a simple pressure control device. When the measured pressure reaches the rated value, the pressure switch can send out an alarm or control signal.

The pressure switch adopts a high-precision, high-stability pressure sensor, and transmission circuit. Then through the dedicated CPU modular signal processing technology, the detection, display, alarm, and control signal output of the medium pressure signal are realized.

Pressure switches can be widely used to measure and control the gauge pressure and absolute pressure of various gases and liquids in the fields of petroleum, chemical industry, metallurgy, electric power, water supply, and other fields.

Get a Quote

Featured Pressure Switches

Pressure switch types

Pressure switches can be divided into coil spring tube pressure switches, diaphragm pressure switches, bellows pressure switches, and bellows pressure switches according to the sensing elements.

Pressure switches can be divided into mechanical and electronic smart pressure switches according to their nature.

According to the setting value, the pressure switch can be divided into an adjustable pressure switch and a non-adjustable pressure switch.

Pressure switches can be divided into general pressure switches, small pressure switches, smart pressure switches, explosion-proof pressure switches, marine pressure switches, differential pressure switches, etc. according to applications.

You can learn more about pressure switches by wikipedia.

How does a pressure switch work?

The working principle of the pressure switch:

When the pressure in the system is higher or lower than the rated safety pressure, the disc in the sensor moves instantaneously. Push the switch connector on or off through the connecting guide rod.

When the pressure drops to or rises to the rated recovery value, the disc is instantly reset and the switch automatically resets. Or simply when the measured pressure exceeds the rated value, the free end of the elastic element is displaced. Push the switch after connecting or comparing Element. Change the on-off state of the switch element to achieve the purpose of controlling the measured pressure.

The elastic elements used in the pressure switch include a single-turn spring tube, diaphragm, bellows and bellows. Switching elements include magnetic switches, mercury switches, micro switches, etc.

What is a pressure switch used for?

Pressure switches used in industrial machinery and systems must be robust, reliable, accurate, and have a long service life.

Pressure switches are usually used in paper machines, air compressors or pump sets.

In this type of equipment, we rely on pressure switches to act as safety devices, alarms, or control elements in the system.

Pressure switch air compressor
An ordinary air compressor consists of three main parts: an electric motor, a V-shaped air pump, and an air storage tank.

There is also a pressure switch in the air compressor, which can adjust the start and stop of the motor. By adjusting the pressure in the oil tank, the air compressor can rest.

The air compressor factory can set a certain starting and stopping pressure according to the requirements of different customers during the commissioning process.

For example, when the compressor starts, the air is pumped into the interior. When the pressure reaches the set value, the pressure switch will contact the contact to stop the motor. When the pressure is lower than the set value, the air compressor will start again to keep the pressure in the oil tank within the pressure range.

How do you test a pressure switch?

The calibration method of pressure switch:

  1. Find out the action setting value of the tested instrument according to the specification.
  2. Select an appropriate pressure signal source to pressurize the test meter. A standard pressure gauge with an appropriate range detects the signal pressure. Use a multimeter to measure the on and off states of the contacts.
  3. For the high report switch, slowly increase the pressure from low to high, and observe the multimeter. When the multimeter indicates a sudden change, the evaluation of the standard pressure gauge is the high reported value.
    Then slowly lower the pressure. When the multimeter indicates a sudden change again, the evaluation of the standard pressure gauge is the reset value.
  4. For the under-report switch, the test pressure should be increased above the set value first, and then slowly decreased.
    When the multimeter indicates a sudden change, the evaluation of the standard pressure gauge is a low value.
    Press again slowly, and when the multimeter indicates a sudden change again, the indication value of the standard pressure gauge is the reset value.

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Frequently asked questions

Pressure switches can be divided into three types: explosion-proof, mechanical, and electronic.

Extended reading: Pressure indicator transmitters

The pressure switch is a utility switch that actively turns on or off when the set value is reached according to the set pressure.
Pressure switches and pressure relays can only be opened or turned on under your given pressure to develop easy positional tube bundles. They are all on-off outputs.
Pressure relays generally supply more input nodes or node types than pressure switches.
The output of the pressure sensor can be an imitation signal or a digital signal. It is convenient for the subsequent level to deal with. It can also become a standard transmitter signal for short-range transmission.

As for the difference between pressure transmitter and pressure sensor, many people are not clear. I will tell you today:
The pressure sensor is a sensor that converts pressure into electrical signal output. When the output electrical signal is a standard signal (such as 4-20mA, 0-10mA, etc.), we call it a pressure transmitter. This is the difference between a pressure sensor and a pressure transmitter. So in general, the pressure sensor we often say is actually a pressure transmitter.

You’ll find the pressure switch mounted on a 1/4-in. tube near the pressure tank. It’s what senses when water pressure has dropped to the point where the pressure tank requires more water. The switch then powers up the well pump.

The working principle of the pressure switch: When the pressure in the system is higher or lower than the rated safety pressure, the disc in the sensor moves instantaneously, and the switch connector is turned on or off through the connecting guide rod. When the pressure drops or rises At the rated recovery value, the disc is reset instantly and the switch automatically resets.

Of course, different pressure switches have different ways of resetting. If you need to reset a pressure switch, you’d better contact the manufacturer. Perform reset operation instructions.

Still have questions?

If you cannot find an answer to your question in our FAQ, you can always contact us
and we will be with you shortly.

Contact Support

Sino-Inst offers over 50 Pressure Switches for pressure measurement. About 50% of these are liquid pressure swithces, 40% is gas pressure switches.

It is widely used in hydropower, tap water, petroleum, chemical, machinery, hydraulic and other industries to measure, display and control the pressure of fluid media on site.

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

Sino-Inst is a globally recognized supplier and manufacturer of Pressure Switch instrumentation, located in China.

High Frequency Dynamic Pressure Sensor

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Dynamic pressure sensor, the transmitter is a high frequency sensor.

The high frequency dynamic pressure sensor adopts silicon stack silicon technology. At the same time, it has high responsiveness. At the same time, it also has high accuracy in low frequency or static data. The high-frequency dynamic pressure sensor has its own hybrid temperature compensation, and the special processing can reach 2000℃ instantaneously. It can provide stable performance in a wide temperature range, with good linearity, high natural frequency, short rise time and wide excellent response frequency band.

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

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More Pressure Sensors

Features of High Frequency Dynamic Pressure Sensor

  • Wide measuring medium range
  • Wide pressure measurement range
  • High natural frequency up to 2MHz
  • Stable work
  • Strong anti-interference ability
  • Original imported components, reliable performance.
  • Small size, light weight, complete types, high cost performance

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

Specifications of High Frequency Dynamic Pressure Sensor

Measuring range-100KPa~0~10KPa…200KPa…1MPa…100MPa
Type of pressureGauge pressure, absolute pressure, negative pressure
Long-term stabilityTypical: ±0.1%FS, maximum: ±0.2%FS/year
Comprehensive accuracy≤±0.25%FS, 0.5%FS
(Comprehensive accuracy includes: linearity + repeatability + hysteresis)
Overload pressure2 times full scale pressure
(100MPa product overpressure is 1.1 times full scale pressure)
Ambient temperature-20 … +85℃
Medium temperature-40 … +85℃, special can be -10℃~200℃
Vibration influence≤±0.01%FS (X, Y, Z axis, 200Hz/g)
Load Resistance≤(U-12)/0.02Ω
Natural frequency150KHz~2MHz
Transmitter frequency response0~1KHz~200KHz
Rise Time0~1mS~2μS
Zero temperature driftTypical: ±0.02%FS/℃, maximum: ±0.05%FS/℃
Sensitivity temperature drift±0.02%FS/℃, maximum: ±0.05%FS/℃
ResolutionInfinitely small in theory, usually 1/100000
MediumGas or liquid compatible with 316 stainless steel
Power supplyTransmitter power supply: 12~36VDC (generally 24VDC),
±15VDC switching power supply or linear power supply
Sensor power supply: constant current: 1mA~4mA;
constant voltage: 5VDC~24VDC
Signal outputAnalog: 4~20mA, 1~5 V DC, 0~10VDC, 0~5V DC
Sensor output: 1.5mV~15mV/V
Insulation resistance100MΩ, 500VDC
Electrical protectionReverse polarity protection, anti-electromagnetic interference
Liquid contact material316L stainless steel
shell material304 stainless steel
Process connectionM20*1.5, G1/4, flush film, other threads can be designed according to customer requirements
Electrical connectionThe cable is IP67 and the connector connection is IP65
weight0.25KG

You may like: How does a pressure transmitter work?

Applications of High Frequency Dynamic Pressure Sensor

  • Military engineering
  • Chemical explosion test
  • Petroleum prospecting and well testing
  • Fluid mechanics
  • Internal combustion engine system
  • aerodynamics
  • Scientific tests such as hydraulic power machinery test
  • Chemical explosion test

Read more about: What is industrial pressure transmitter?

More Featured Pressure Sensors

SI-303 Low-Pressure Transducer
Low pressure transducers for air and non-corrosive gases low pressure measurement. 0 ～ 2.5kPa to 0 ～ 30kPa measurable.
SI-350 Sanitary Pressure Transmitter
Sanitary Pressure Transmitter, also called tri clamp pressure transmitter,
is the pressure transducer with the flush diaphragm (flat membrane) as the pressure sensor.
SI-300 Pressure Transducer 4-20mA/Voltage
The 4-20mA/ Voltage Pressure Transducer,
also called pressure transmitter 4-20mA,
is a pressure sensor with4-20ma/Voltage output.
SI-390 Industrial Pressure Transmitter
Pressure transmitters for general industrial applicaitons. -0.1kPa ~ 0 ~ 0.01kPa ~ 100MPa ~150MPa. 0.1% FS, 0.25% FS, 0.5% FS. 4-20mA (2-wire system), 0-5 / 1-5 / 0-10V (3-wire system)
SI-512H High Temperature Pressure Sensor
High Temperature Pressure Sensor for pressure measurement of high temperature gas or liquid. Such as steam pressure. High temperature up to 800 ℃.

SIJC-1000HSM-Silicon Pressure Sensor
Silicon pressure sensor, also known as Diffused silicon pressure sensor. Silicon pressure sensors are low cost.
SI-706 Combined Pressure and Temperature Sensor-Dual function
Combined pressure and temperature sensor for Simultaneous measurement of pressure and temperature.
Thermocouple types: J, K, E type or PT100 platinum resistance. Two outputs do not affect each other. 
SI-338 Ceramic Pressure Sensor
Ceramic pressure sensor is a pressure sensor refined from a thick ceramic base using a refined ceramic base. Cost-effective. Support OEM processing. 0-0.2MPa -…- 40MPa

Extended reading: Static pressure vs dynamic pressure vs total pressure

More Solutions for pressure measurement

Extended Reading: Digital Pressure Sensor-RS485

Sino-Inst offers over 20 Pressure sensors. A wide variety of  Pressure sensors options are available to you. Such as free samples, paid samples. Sino-Instrument is a globally recognized manufacturer of Pressure sensors, located in China.

Sino-Inst  sells through a mature distribution network that reaches all 30 countries worldwide. Pressure sensors products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting from certified suppliers. With ISO9001, ISO14001 certification.

Wireless Pressure Sensors

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

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

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More Pressure Sensors

Featured Wireless Pressure Sensors

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

Features of Wireless Pressure Sensors

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

Low power-battery powered

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

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

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

Application of wireless pressure sensor

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

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

Read more about: What is industrial pressure transmitter?

NB-IoT Wireless Pressure Transmitter Networking Solution

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

Industry pain points:

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

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

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

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

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

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

Wireless Level Sensor – LoRa

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

Read More about: Wireless Level Sensor – LoRa

Wireless pressure sensor system

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

System design

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

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

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

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

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

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

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

Extended Reading: How does a MEMS pressure sensor work?

Pressure transducers for sale

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

More Applications and Markets of Wireless Pressure Sensors

What is Static Water Pressure?

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

Water Pressure Transducers

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

Wireless pressure sensor manufacturer

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

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

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

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

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

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

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Hydrostatic Level Measurement

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

What Is Hydrostatic Pressure?

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

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

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More Pressure Transmitters

Select a Featured hydrostatic level sensor for your application 

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

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

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

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

Extended reading: sludge level measurement

Hydrostatic level measurement with Pressure Transmitters

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

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

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

Pros & Cons of Hydrostatic level measurement system

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

Advantages

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

Disadvantages

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

Hydrostatic level sensor installation guide

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

Hydrostatic level sensor can also be used with paperless recorder.

Capacitive vs Hydrostatic level sensor

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

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

Extended reading: Hydrostatic Pressure Transmitter

Frequently
Asked
Questions

Help Center

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

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

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

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

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

Related Blogs

Hydrostatic level sensor price

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

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

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

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

Extended Reading: bin level measuring system

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

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

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

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

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

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SI-302 Anti-corrosive Submersible Level Transmitter

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

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

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

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More Hydraostatic Level Sening

Features of SI-302 Anti-corrosive Submersible Level Transmitter

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

Specifications of Submersible Level Transmitter

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

Extended reading: sludge blanket level detector

Applications of Anti-corrosive Submersible Level Transmitter

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

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

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

Extended reading: Applications of Radar Corrosive Liquid Chemical Level Sensor

How do Submersible Level Transmitters Work?

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

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

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

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

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

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

More Submersible Pressure Transmitters for level measurement

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

Submersible Level Transmitter Calibration

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

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

Submersible Level Transmitter installation and precautions

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

A. Instructions for installation of input liquid level sensor:

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

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

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

Learn More About Submersible Level Transducer.

How to use Submersible Level Transmitter ?

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

Submersible Level Transmitter for Wastewater

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

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

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

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

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

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

FAQ

What is hydrostatic level sensor?

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

What is the water level sensor?

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

What is ultrasonic level sensor?

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

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

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

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

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Remote Seal Differential Pressure Transmitter

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

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

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

CONTACT US
More DP Transmitters

Features of Remote Seal Differential Pressure Transmitter

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

Specifications of Remote Seal Differential Pressure Transmitter

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

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

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

Read more What is a diaphragm seal?

DP Remote Seal Pressure Transmitter with Diaphragm Seal Installation

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

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

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

We can learn more about 1199 remote diaphragm.

Read more about: Differential Pressure Transmitter Installation Guide

Applications of Remote Seal Differential Pressure Transmitter

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

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

Extended reading: SI-703 Flush Diaphragm Pressure Sensor

Precautions for use:

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

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

Extended reading: Smart Differential Pressure Transmitter

Remote Seal Differential Pressure Transmitters Working Principle

What is a diaphragm seal?

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

A diaphragm seal has two primary tasks:

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

You may like: Diaphragm pressure gauge

What is remote seal?

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

What are the advantages of diaphragm seals?

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

How do diaphragm seals work?

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

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

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

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

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

Diaphragm type level transmitter working principle

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

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

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

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

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

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

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

More

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

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

FAQ

What is remote seal pressure transmitter?

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

What is remote seal for level transmitter?

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

What is differential pressure transmitter working principle?

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

What is diaphragm seal pressure transmitter?

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

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



Extended Reading: Differential Pressure (DP) Flow Meters Technology

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

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Extended Diaphragm Seal DP Level Transmitter

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Extended Diaphragm Seal DP Transmitter is a level transmitter direct mounted on pipe or tank. The isolation diaphragm is in direct contact with the liquid medium.

Extended Diaphragm Seal DP Level Transmitter is a field level transmitter that is directly mounted on a pipe or container. The isolation diaphragm is in direct contact with the liquid medium. There is no need to lead out the positive pressure side with a pressure pipe. Therefore, it can measure the liquid level, pressure and density of high temperature, high viscosity, easy crystallization, easy precipitation and strong corrosion. Convert to 4 ～ 20mA. DC signal output.

The flanges are made of high-quality stainless steel materials such as 304 and 316. Wetted diaphragms are made of imported high-quality anti-corrosive materials such as 316L, Hastelloy C-276, Monel, and tantalum.

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

CONTACT US
More DP Transmitters

Features of Extended Diaphragm Seal Differential Pressure Transmitter

  • Simple structure: There are no movable or elastic elements. Therefore, the reliability is extremely high. The amount of maintenance is very small.
  • Easy installation: The built-in structure especially shows this feature. No special tools are required.
  • Convenient adjustment: The two potentiometers of zero position and range can carry out zero point migration or range change at will within the effective range of liquid level detection. The two adjustments do not affect each other.
  • Widely used: Suitable for liquid level measurement of high temperature and high pressure, strong corrosion and other media.

Specifications of Extended Diaphragm Seal Level Transmitter

Measuring range:can be customized within the range of -4-4MPa (-10-10KPa, 0-50KPa, etc.)
Output signal: 4 ～ 20MA.DC two-wire system (analog). Two-wire system 4 ～ 20mA DC signal is superimposed with digital signal. Linear or square root output is selected by the user. (Smart)
Power supply:12 ～ 45V.DC
Range ratio: 10: 1 or 100 to 1
Power supply impact: <0.005% output range / V
Load effect: When the power supply is stable, there is no load effect.
Measurement accuracy: 0.1% of the calibration range. Standard accuracy is 0.2%. If other accuracy is selected, please indicate when ordering and selecting.
Resistance: usually adjustable between 0.1 to 16 seconds. When filling with inert liquid or with a remote transmission device, the time constant will increase.
Startup time: <2 seconds, no warm-up required
Working environment: ambient temperature -29 ～ 93 ℃ (analog amplifier)
 -29 ～ 75 ℃ (digital / smart amplifier)
    -29 ～ 65 ℃ (with display head)
Environmental humidity: 0 ～ 95%
Protection characteristics: protection ability IP65
Explosion-proof type: Flameproof Exd II BT4-6. Intrinsically safe Exia II CT5
Static pressure effect:Zero point error (can be eliminated under static pressure)
Static pressure from 0 ～ 13.7MPa, ± 0.2% / 6.9MPa
 Static pressure exceeds 13.7MPa, ± 0.5% / 6.9MPa

Extended reading: Smart Differential Pressure Transmitter

Applications of Extended Diaphragm Seal DP Level Transmitter

Extended Diaphragm Seal DP Transmitter can measure the liquid level, pressure and density of high temperature, high viscosity, easy crystallization, easy precipitation and strong corrosion and other media. Then convert it to 4-20mA. DC signal output

Mainly used for measurement in the following occasions:

  • Viscous medium at high temperature.
  • Easily crystallized medium.
  • Precipitated media with solid particles or suspended matter.
  • Strongly corrosive or highly toxic media.
  • It can eliminate the leakage of the pressure guiding pipe and pollute the surrounding environment. When the isolation liquid is used, the tedious work of frequently replenishing the isolation liquid due to the unstable measurement signal can be avoided.
  • Continuously and accurately measure the interface and density.
  • The remote transmission device can avoid the mixing of different instantaneous media, so that the measurement results truly reflect the actual situation of process changes.
  • Hygiene and cleaning requirements are high.
  • For example, in the production of food, beverage and pharmaceutical industries, not only the location of the transmitter in contact with the media must meet hygienic standards, but it should be easy to rinse.

You may like: Diaphragm pressure gauge

Extended Diaphragm Deal Application

Diaphragm seals are used for the protection of pressure measuring instruments in applications with difficult media. In diaphragm seal systems, the diaphragm of the diaphragm seal affects the separation of the instrument and the medium.

The pressure is transmitted to the measuring instrument via the system fill fluid which is inside the diaphragm seal system.

For the implementation of demanding customer applications, there are a wide variety of designs, materials and system fill fluids available.

Applications

  • Aggressive, highly viscous, crystallising or hot media
  • Process industry
  • Thick-walled or insulated pipelines and vessels

Read more What is a diaphragm seal?

1199EFW Extended Diaphragm Seal

The specifications of commonly used Extended Diaphragm Seals are as follows:

DN50 (2 ”) flange size specification table

FlangeACFEBNumber of bolts nBolt diameter
150LB150120954819418
300LB165127954820818
600LB165127954832818
900LB215165954845826
PN1.6/1.0165125954818418
PN2.5/4.0165125954820418
PN6.4180135954826422

DN80 (3 ”) flange size specification table

FlangeACFEBNumber of bolts nBolt diameter
150LB1901521247420418
300LB2101681247425822
600LB2101681247438822
900LB2401911247454826
PN1.6/1.02001601247420818
PN2.5/4.02001601247424818
PN6.42151701247428822

DN100 (4 ”) flange size specification table

FlangeACFEBNumber of bolts nBolt diameter
150LB2301901558924418
300LB2552001558932822
600LB2752151558945826
900LB2902351558950833
PN1.6/1.02001801558920818
PN2.5/4.02001901558924822
PN6.42152001558928826

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

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

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

Extended reading: SI-703 Flush Diaphragm Pressure Sensor

Diaphragm type level transmitter working principle

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

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

For closed tanks. Set the bottom pressure to P. If the pressure on the liquid surface is P3 and the liquid level height is H, then:

P = P3 + Hpg (3-11)

In the formula: p is the medium density; g is the acceleration of gravity.
From the formula ((3-1 “available:
△ P = P-P3 = Hpg (3-12)

Usually the density of the measured medium is known, the pressure difference △ P is proportional to the liquid level height H. The pressure difference on the side will know the measured liquid level height.

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

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

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

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SMT3151DP intelligent differential pressure transmitter uses advanced microprocessor technology and digital communication technology. The basic principle of differential pressure transmitter is: divide a space with sensitive elements (multi-purpose capsule) into two chambers. Introduce pressure into the two chambers separately. The sensor produces displacement (or displacement trend) under the combined action of the two pressures. This displacement is proportional to the pressure difference (differential pressure) between the two chambers. Convert this displacement into a standard signal output that can reflect the magnitude of the differential pressure.

Comparative analysis – 7 Tank Level Measurement Sensors

Magnetostrictive Level Sensor in Storage Tank Level Measurement

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