Flush diaphragm pressure sensor is also called flush diaphragm pressure transducer or flush diaphragm pressure transmitter. Flush diaphragm pressure sensor has Flush membrane / diaphragm structure, anti-blocking design. Pressure measurement of viscous media.

SI-703 Flush diaphragm pressure sensor

Flush diaphragm pressure sensor uses a diaphragm isolation process. Feel the pressure directly with a flat membrane. There is no pressure hole in the test head. There is no clogging of viscous media during the measurement. Adopting flush membrane structure, diffused silicon pressure-sensitive core body, with good moisture resistance and excellent media compatibility. The sensor interface is available in clamp, thread and flange options. The output signal can be selected from voltage, current, and so on. The flush diaphragm of the sensor prevents problems such as scaling, unsanitary and clogging of viscous liquids.

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

This type of pressure sensor is also commonly known as: Flat film pressure sensor. Diaphragm pressure transmitter. Paint pressure sensor. Food pressure sensor. Diaphragm pressure sensor. Diaphragm pressure transmitter. Or sanitary pressure transmitter.

Flush diaphragm pressure sensor, including strain type and diffused silicon front type.

The strain-type flush-membrane measuring end adopts a special, sturdy flush diaphragm. Hard particles in the measured medium will not damage the isolating diaphragm. Compact structure, corrosion resistance, anti-vibration, anti-particle impact, wide temperature compensation.

Diffusion silicon front type is made of imported diffusion silicon core. Use calibration and digital compensation technology. The product has reliable performance and stable output.

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Features of SI-703 Flush diaphragm pressure sensor

Features of SI-703 Flush diaphragm pressure sensor
 Diaphragm pressure transmitter
  • The imported resistance strain gauge is used as a pressure-sensitive chip. The anti-blocking design of the flush membrane / diaphragm structure can measure viscous media.  
  • Advanced patch technology and process; 
  • It can bear large impact pressure, and the bearing pressure can reach 100MPa; 
  • The temperature drift is small, and it can work stably at the working temperature of -20 ~ 85 ℃ for a long time;
  • The elastomer is also connected to the joint using a fully sealed or integrated structure. Solve the oil / gas shortcomings of diffused silicon and ceramic core pressure sensor cores. Reliable work and high fatigue strength;
  • It is specially designed for OEM processing of pressure transmitter manufacturers. Low cost. Suitable for mass production;

Specifications of SI-703 Flush diaphragm pressure sensors

703 Flush diaphragm pressure transmitter
Model703 Flush diaphragm pressure transmitter
Range0-0.6,1,5,10,20,30,40,50 ~ 200MPa
Comprehensive accuracy0.1% FS, 0.2% FS, 0.5% FS
Output signal4-20mA (two-wire system), 0-5 / 1-5 / 0-10VDC (three-wire system)
Supply voltage24VDC (10-30VDC)
Medium temperature-20 ~ 75 ℃
Ambient temperature-20 ~ 75 ℃
Load ResistanceCurrent output type: max. 800Ω; voltage output type: greater than 50KΩ
Insulation resistanceMore than 2000MΩ (100VDC)
Sealing levelIP65
Long-term stable performance0.1% FS / year
Vibration effectWithin the mechanical vibration frequency of 20Hz ~ 1000Hz, the output change is less than 0.1% FS
Electrical InterfaceMetal sealed terminal, four-core aviation connector
Mechanical connectionM20 × 1.5, G1 / 2-14, etc., other threads can be customized
703F waterproof Flush diaphragm pressure sensor
Model703F waterproof Flush diaphragm pressure sensor
Range  0-1, 2, 4, 5, 10, 20, 30, 40, 50 to 200 MPa
Comprehensive accuracy0.2% FS, 0.5% FS, 1.0% FS
Output signal4-20mA (two-wire system), 0-5 / 1-5 / 0-10VDC (three-wire system)
Supply voltage24VDC (10-30VDC)
Medium temperature-20 ~ 75 ℃
Ambient temperature-20 ~ 75 ℃
Load Resistance  Current output type: max. 800Ω; voltage output type: greater than 50KΩ
Insulation resistanceMore than 2000MΩ (100VDC)
Sealing levelIP65
Long-term stable performance0.1% FS / year
Vibration effect  Within the mechanical vibration frequency of 20Hz ~ 1000Hz, the output change is less than 0.1% FS
Electrical InterfaceWaterproof outlet
Mechanical connectionM20 × 1.5, G1 / 2-14, etc., other threads can be designed according to customer requirements
703K Flush diaphragm pressure sensor
Model703K Flush diaphragm pressure sensor
Range0-2,1,5,10,20,30,40,50 ~ 100MPa
Comprehensive accuracy0.1% FS, 0.2% FS, 0.5% FS
Output signal1-1.5mV / V
Supply voltage10VDC
Medium temperature-20 ~ 85 ℃
Ambient temperature-20 ~ 85 ℃
Load Resistance1500Ω
Insulation resistance  More than 2000MΩ (100VDC)
Sealing levelIP65
Long-term stable performance0.1% FS / year
Vibration effect/
Electrical InterfaceDirect outgoing
Mechanical connectionΦ19 standard size
703W Flush diaphragm  micro pressure sensor
Model703W Flush diaphragm micro pressure sensor
Range0, 1.5, 2, 10, 30, 50, 100-500KPa, 1-60MPa
Comprehensive accuracy0.25% FS, 0.5% FS
Output signal4-20mA (two-wire system), 0-5 / 1-5 / 0-10VDC (three-wire system)
Supply voltage24VDC (10-30VDC)
Medium temperature-20 ~ 65 ℃
Ambient temperatureNormal temperature (-20 ~ 65 ℃)
Load ResistanceCurrent output type: max. 800Ω; voltage output type: greater than 50KΩ
Insulation resistanceMore than 2000MΩ (100VDC)
Sealing levelIP65
Long-term stable performance0.1% FS / year
Vibration effectWithin the mechanical vibration frequency of 20Hz ~ 1000Hz, the output change is less than 0.1% FS
Electrical InterfaceHessman connector, other optional
Mechanical connectionM24 * 1.5, M25 * 1.5, M27 × 2, etc. Other threads can be designed according to customer requirements
703C Flush diaphragm  micro pressure sensor
Model703C Flush diaphragm micro pressure sensor
Range0-10, 30, 50, 100 ~ 500KPa, 1-7MPa
Comprehensive accuracy0.1% FS, 0.2% FS, 0.5% FS
Output signal4-20mA (two-wire system), 0-5 / 1-5 / 0-10VDC (three-wire system)
Supply voltage24VDC (10-30VDC)
Medium temperature-20 ~ 65 ℃
Ambient temperature-20 ~ 65 ℃
Load ResistanceCurrent output type: max. 800Ω; voltage output type: greater than 50KΩ
Insulation resistance≥2000MΩ (100VDC)
Sealing levelIP65
Long-term stable performance0.1% FS / year
Vibration effectWithin the mechanical vibration frequency of 20Hz ~ 1000Hz, the output change is less than 0.1% FS
Electrical InterfaceHessman connector, four-core aviation connector optional
Mechanical connection  M20 × 1.5, G1 / 2-14, etc.
703G Flush diaphragm pressure sensor
Model703G Flush diaphragm pressure sensor
(Alternative WiKa similar products)
Range0 ~ 5, 10, 20, 50, 100-500KPa, 1-7MPa
Comprehensive accuracy0.1% FS, 0.2% FS, 0.5% FS
Output signal4-20mA (two-wire system), 0-5 / 1-5 / 0-10VDC (three-wire system)
Supply voltage24VDC (10-30VDC)
Medium temperature-20 ~ 65 ℃
Ambient temperatureNormal temperature (-20 ~ 65 ℃)
Load Resistance  Current output type: max. 800Ω; voltage output type: greater than 50KΩ
Insulation resistanceMore than 2000MΩ (100VDC)
Sealing levelIP65
Long-term stable performance0.1% FS / year
Vibration effectWithin the mechanical vibration frequency of 20Hz ~ 1000Hz, the output change is less than 0.1% FS
Electrical InterfaceHessman connector, other optional.
Mechanical connectionM20×1.5,G1/2-14
703GB Flush diaphragm pressure sensor
Model703GB Flush diaphragm pressure sensor (Alternative WiKa similar products)
Range  0 ~ 5,10,20,50,100KPa ~ 1MPa, 2,3,10MPa
Comprehensive accuracy0.1% FS, 0.2% FS, 0.5% FS
Output signal4-20mA (two-wire system), 0-5 / 1-5 / 0-10VDC (three-wire system)
Supply voltage24VDC (10-30VDC)
Medium temperature-20 ~ 65 ℃
Ambient temperatureNormal temperature (-20 ~ 65 ℃)
Load ResistanceCurrent output type: max. 800Ω; voltage output type: greater than 50KΩ
Insulation resistanceMore than 2000MΩ (100VDC)
Sealing levelIP65
Long-term stable performance0.1% FS / year
Vibration effectWithin the mechanical vibration frequency of 20Hz ~ 1000Hz, the output change is less than 0.1% FS
Electrical InterfaceHessman connector, other optional.
Mechanical connectionG1

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

SI-703 Flush diaphragm pressure sensor Applications

The sensor’s Flush diaphragm structure prevents problems such as scaling, unsanitation, and sticky liquid clogging. Widely used in food, pharmaceutical, brewing and other process control fields. It is suitable for the pressure measurement and control of viscous media such as chemical coatings, paints, muds, asphalts, and crude oil under weak pressure. Its industry applications are as follows:

  1. Food hygiene industry;
  2. Paper industry;
  3. Sewage level measurement;
  4. Beverage tank liquid level measurement;
  5. Pipeline level measurement;
  6. Pharmaceutical and biological products processing.
  7. Pressure transmitter manufacturer OEM
  8. Pressure measurement and control of viscous media

Flush diaphragms appear flush from the surface, so they are called flush diaphragms.

A flush diaphragm is a diaphragm that is fully open and exposed to the pressure medium. The flush diaphragm is level or slightly recessed with the surrounding surface when installed.

The purpose of the flush membrane is to prevent the viscous medium from blocking the pressure hole, or to use a special material for better measurement with the medium to avoid damage to the sensor chip material, etc.

In short, the way to measure or protect the sensor according to the specific application

Flush pressure sensor refers specifically to Pressure Sensors with Flush Diaphragms. Pressure transmitters and transducers with open flush diaphragms suitable for use with highly viscous media such as plastics, paper pulp, bitumen, sewage, paint and adhesives.

Flushing connection is different from the common internal diaphragm pressure measurement method.

Internal diaphragm is the industry standard for most gaseous and liquid media because it is inexpensive and easy to handle.

However, once it encounters the measurement of viscous media, or in the case of high hygiene requirements. Keeping the Flushing connection can effectively avoid blockage. And meet the sanitary cleaning requirements.

Flush Mount Diaphragm can be:
Clamp flat film installation, threaded flat film installation, or flange flat film installation. Sometimes there are customers who need special cavityless flat membranes.

Clamp Flush Membrane Pressure Sensor

Clamp Flush Membrane Pressure Sensor

The clamp type adopts a silicone oil filling technology, and the pressure felt by the diaphragm is transmitted to the pressure chip through the silicone oil. The compensation circuit corrects the pressure signal to a linear electrical signal.

The stressed diaphragm on the end face of the clamp is exposed to directly feel the pressure. Prevents scaling, unsanitary and sticky pressure clogging problems. It is widely used in hygiene industries such as food, medicine, brewing and other occasions where the measuring medium may be fouled.

Threaded flush membrane pressure sensor

Threaded flush membrane pressure sensor

The threaded flush Diaphragm pressure transmitter uses a flat membrane to directly sense the pressure signal. The diffusion silicon pressure core is used as the sensitive element. The standard silicone oil or olive oil is used as the pressure transmission medium.

The measuring end is made of 316L stainless steel, and the flush isolation diaphragm is specially welded. Compact structure, corrosion resistance, vibration resistance, wide temperature compensation.

Flange flush Diaphragm pressure transmitter

Flange flush Diaphragm pressure transmitter
  • Shell optional;
  • flange mounting;
  • Two-wire system, 4~20mA analog output, HART® protocol digital communication;
  • Smart LCD head with backlight;
  • Large-size diaphragm, fully welded and sealed, long-term reliability and durability;
  • For pressure measurement of gas, liquid, steam;
  • Anti-corrosion diaphragm is optional (tantalum, Kazakhstan C, 316L, 316L sprayed with PTFE);
  • Especially suitable for high temperature viscous liquid;
Cavityless flush Diaphragm pressure transmitter

Cavityless flush Diaphragm pressure transmitter

Cavityless flush Diaphragm pressure transmitter

The cavityless flush Diaphragm pressure transmitter adopts a high-precision foil strain gauge and has no cavity to measure the diaphragm. It is especially suitable for measuring liquids with high viscosity.

The product adopts an improved and optimized installation structure, which makes the product have good anti-vibration ability.

Equipped with a variety of characteristic amplifying circuits, such as anti-interference, high temperature resistance, intrinsically safe explosion-proof, etc., making the modification suitable for various measurement and control occasions such as oil fields and food.

Working Principle

Working Principle of flush diaphragm pressure sensor

Flush diaphragm pressure sensors use processes such as diffusion or ion implantation to form resistors and connect them to a Wheatstone bridge. Micro-machining technology is used to form a pressure-sensitive diaphragm under the bridge. When pressure is applied to the diaphragm, the resistance value changes and a linearized output signal is generated that is proportional to the applied pressure. When we add DC power to the Wheatstone bridge, a DC voltage signal will be output. After the second conversion line, the two-wire system 4 ~ 20MA output is realized.

When to Use a Flush Diaphragm Pressure Connection?

In short, there are two cases, we can first consider Flush Diaphragm Pressure Connection.

The first is hygienic applications. Such as Pharmaceutical, Food, Beverage & Biotech.

For these applications the concern is not necessarily high viscosity but more to do with cleanliness. The wetted part of the Flush Diaphragm Pressure Sensor is flat. No holes, no ripples. This way, residue-free cleaning is easy.

The second is High Viscosity Liquids or Crystals.

Substances such as paints, oils, waxes, pastes, tars, plastic melts or slurries can clog the process connections of the pressure sensor.

The media may be too hard to adequately fill the internal voids of the pressure connector. Or once the process cools, the substance may wax. For these types of substances, it is necessary to specify a flushing connection in which the diaphragm is fully open.

Some pressure transducers have the option of flush-embedded diaphragms where mechanical damage to the diaphragm is a concern.

WIKA has a great video on When to use a front-flush pressure connection? Let’s take a look.

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Frequently
Asked
Questions

In short, a pressure sensor converts pressure into a small electrical signal, which is sent and displayed. Therefore, these are also commonly referred to as pressure transmitters. Two common signals used are 4 to 20 mA signals and 0 to 5 volt signals.

Most pressure sensors work using the piezoelectric effect. This is when the material generates a charge in response to stress. This stress is usually compressive, but may be twisted, bent, or vibrated.

Pressure sensors detect pressure and can determine the amount of pressure by measuring the charge.

The pressure sensor needs to be calibrated in order to know what voltage or milliamp (mA) signal corresponds to what pressure. This is the basic “zero” and “span” calibration or minimum and maximum, which is a common job for maintenance personnel.

Pressure gauge according to its measurement accuracy:

Can be divided into precision pressure gauges, general pressure gauges.
The precision level of precision pressure gauges is 0.1, 0.16, 0.25, 0.4 and 0.05.
The accuracy levels of general pressure gauges are 1.0, 1.6, 2.5, and 4.0.

Pressure gauge according to its measurement basis:

Pressure gauges are divided into: general pressure gauges, absolute pressure gauges, stainless steel pressure gauges, and differential pressure gauges according to the basis of their indicated pressure.
General pressure gauges are based on atmospheric pressure.
The absolute pressure gauge is based on the absolute zero pressure.
The differential pressure gauge measures the difference between two measured pressures.

Pressure gauge according to its measuring range:

Divided into vacuum gauges, pressure vacuum gauges, micro pressure gauges, low pressure gauges, medium pressure gauges and high pressure gauges.

Vacuum gauges are used to measure pressure values ​​below atmospheric pressure.

Pressure vacuum gauges are used to measure pressure values ​​less than and above atmospheric pressure.

Micro pressure gauges are used to measure pressure values ​​less than 60,000 Pa.

Low pressure meter is used to measure 0 ~ 6MPa pressure value.

Medium pressure gauge is used to measure the pressure value of 10 ~ 60MPa.

High pressure gauge is used to measure pressure value above 100MPa.

Pressure gauge according to its display mode:
Divided into pointer pressure gauge. Digital pressure gauge.

The pressure gauge is divided according to its use function:
Pressure gauges can be divided into local indication pressure gauges and charged signal control pressure gauges according to their different functions.

General pressure gauges, vacuum pressure gauges, shock-resistant pressure gauges, stainless steel pressure gauges, etc. are all in-situ indicating pressure gauges. They have no other control functions except the indicated pressure.

The output signals of the pressure signal-controlled pressure gauge mainly include:

1. Switching signal (such as electric contact pressure gauge)
2. Resistance signal (such as resistance remote pressure gauge)
3. Current signals (such as inductive pressure transmitters, remote pressure gauges, pressure transmitters, etc.)

According to the purpose of the pressure gauge:

It can be divided into: ordinary pressure gauge, ammonia pressure gauge, oxygen pressure gauge, electric contact pressure gauge, remote transmission pressure gauge, vibration resistance pressure gauge, pressure gauge with inspection pointer, double needle double tube or double needle single tube pressure gauge, digital display Pressure gauges. Digital precision pressure gauges.

Pressure sensors are mainly divided into two types: semiconductor piezoresistive type and electrostatic capacity type. Below we introduce their principles.

Semiconductor piezoresistance type:
The semiconductor piezoelectric impedance diffusion pressure sensor forms a semiconductor deformation pressure on the surface of the sheet. The sheet is deformed by an external force (pressure) to produce a piezoelectric impedance effect. The change in impedance is converted into an electrical signal.

Capacitance type:
The electrostatic capacitance type pressure sensor is a capacitor that opposes the fixed pole of glass and the movable pole of silicon to form a capacitance. It converts the change in electrostatic capacity generated by deforming the movable pole by external force (pressure) into an electrical signal.

A pressure sensor (Pressure Transducer) is a device or device that can sense the pressure signal and convert the pressure signal into a usable output electrical signal according to a certain rule.

At present, there are many types of core materials for pressure sensors. The performance of several core materials is briefly introduced below.
1. Single crystal silicon
2. Polysilicon
3. Silicon-Sapphire
4. Compound semiconductor materials
5. SiC thin film material

diaphragm pressure gauge is a device,

that uses a diaphragm with a known pressure to measure pressure in a fluid.

It has many different uses, such as monitoring the pressure of a canister of gas, measuring atmospheric pressure. Or recording the strength of the vacuum in a vacuum pump.

The diaphragm pressure gauge consists of a circular membrane, made from sheet metal of precise dimensions, which can either be flat or corrugated.

The diaphragm is mechanically connected to the transmission mechanism, which will amplify the small deflections of the diaphragm, and transfer them to the pointer.

Read more about: SI-D100 Diaphragm pressure gauge

Related Products

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

Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Flush diaphragm 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.

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