Differential Pressure Transmitter is a high-precision intelligent on-site differential pressure detection instrument. It is used to measure the parameters of differential pressure, pressure and liquid level of various media in the state of liquid, gas and steam. And convert the measured differential pressure parameters into 4-20mA standard electrical signal output. At the same time, it adopts the HART protocol and has the function of communicating with the handheld device or the host computer. The transmitter has output parameter configuration function, which can meet the needs of different users. It can accurately measure differential pressure, liquid level, vacuum and specific gravity.
Features of SI-3151DP Differential Pressure Transmitter
- Complete measuring range: 0-0.15kPa～42MPa.
- The structure is compact, strong and anti-vibration. Integrated junction box. Local zero and span adjustment. LCD display configuration buttons. Simplify installation, calibration and operation.
- Non-contact local zero point, range adjustment and LCD liquid crystal display parameter configuration buttons are designed on the transmitter housing.
- It adopts solid, plug-in printed circuit board and modular structure. It is helpful for troubleshooting.
- The damping is adjustable, which improves the user’s selectivity.
- Intelligent circuit, user-friendly operation.
- It has independent anti-electromagnetic interference circuit and software anti-interference design.
- It has a sensor for measuring temperature parameters inside. It improves the compensation performance of the transmitter’s ambient temperature.
- Can be displayed directly: measured pressure value. Output analog current value. The measured pressure corresponds to the percentage value of the set range. The temperature value of the sensor body and the medium it is in contact with.
- The transmitter improves the fault recovery capability. It greatly reduces the maintenance workload of the transmitter.
- The LCD liquid crystal display meter works in a multi-parameter cycle display mode.
- With HART protocol remote communication function.
- The innovative design of the δ chamber structure with a fully metal-sealed differential capacitance pressure sensor has achieved significant improvement and good stability in differential pressure (pressure) and temperature measurement.
SI-3151DP Differential Pressure Transmitter – Capacitive Specifications
| Item | Specification |
| Measuring range: | 0~0.1kPa to 0~41MPa |
| Output signal: | 4~20mADC (specially for four-wire 220V power supply, 0~10mADC output), Support 0-5V, 0-10V customization |
| Power supply: | 12~45V DC, generally 24V DC (see the load characteristics in the figure) |
| Load characteristics: | related to the power supply, the load capacity at a certain power supply voltage is shown in the figure (load characteristics), the load impedance RL and the power supply voltage V. The relationship is: RL≤50 (Vs-12) |
| Local Display | pointer type linear indication 0 ~ 100% equal division scale or LCD liquid crystal type, LED digital tube display. |
| Explosion-proof: | a. Flameproof type dIIBT4; b. Intrinsically safe iaIICT6 |
| Temperature range: | Amplifier operating temperature range: -29 ~ +93°C (LT type: -25-+70°C) |
| Measuring element filled with silicone oil: | -40~ +104°C |
| When the flange transmitter is filled with high temperature silicone oil: | -20~ +315°C, ordinary silicone oil: -40~ +149°C |
| Static pressure: | 1, 4, 10.25, 32Mpa |
| Humidity: | Relative humidity is 0 ~ 100% |
| Accuracy: | +0.25%, +0.5%, ±0.1% (intelligent) |
| Stability: | the excellent value of the basic error within six months does not exceed the maximum range |
| Vibration effect: | on any axis, when the vibration frequency is 200Hz, the error is +0.05%/g of the upper limit of the measurement range |
| Power supply influence: | less than 0.005%V of the output range |
| Isolating Diaphragm: | 316 Stainless Steel, Hastelloy C-276, Monel or Tantalum |
| Vent/Drain Valve: | 316 Stainless Steel, Hastelloy C, Monel |
| Flanges and Fittings: | 316 Stainless Steel, Hastelloy C or Monel |
| Contact medium “O” ring: | nitrile rubber, fluorine rubber |
| Filling fluid: | silicone oil or inert oil |
| Bolt: | 316L stainless steel |
| Electronic housing material: | low copper aluminum alloy |
| Pressure introduction connector: | flange, NPT1/4, center distance 54mm; joint NPT1/2 or M20X1.5 male thread spherical cone seal, center distance 50.8.54. T12716-91) Signal wire connection hole: G 1/2” |
| Weight: | 2.4kg |
Order Guide
| Model | Transmitter type | |||||
| SI-1303DP | Pressure transmitter | |||||
| SI-1303HP | Absolute pressure transmitter | |||||
| Code | Scale range | |||||
| 2 | 0-0.10～3.5kPa(0-10～350mmH2O) | |||||
| 3 | 0-0.8～8.0kPa(0-80～800mmH2O) | |||||
| 4 | 0-4.0～40kPa(0-400～4000mmH2O) | |||||
| 5 | 0-20～200kPa(0-2000～20000mmH2O) | |||||
| 6 | 0-70～700kPa(0-0.7～7kgf/cm2) | |||||
| 7 | 0-210～2100kPa(0-2.1～21kgf/cm2) | |||||
| 8 | 0-700～7000kPa(0-7.0～70kgf/cm2) | |||||
| 9 | 0-2.1～21MPa(0-21～210kgf/cm2) | |||||
| 0 | 0-4.1～41MPa(0-41～4100kgf/cm2) | |||||
| Code | Output form | |||||
| E | Linear output 4-20mAdc | |||||
| SF | Linear/square root output 4-20mAdc +HART signal,，Full function buttons on site | |||||
| F | MODBUS-485 signal | |||||
| Code | Structural materials | |||||
| Flange connector | Exhaust/Drain valve | Isolation diaphragm | Filling liquid | |||
| 22 | 316 Stainless steel | 316 Stainless steel | 316 Stainless steel | Silicone oil | ||
| 23 | 316 Stainless steel | 316 Stainless steel | Hastelloy C | Silicone oil | ||
| 24 | 316 Stainless steel | 316 Stainless steel | Monel | Silicone oil | ||
| 25 | 316 Stainless steel | 316 Stainless steel | Tantalum | Silicone oil | ||
| 33 | Hastelloy C | Hastelloy C | Hastelloy C | Silicone oil | ||
| 35 | Hastelloy C | Hastelloy C | Tantalum | Silicone oil | ||
| 44 | Monel | Monel | Monel | Silicone oil | ||
| Code | Shell material | Conduit inlet dimensions | ||||
| A | Low copper aluminum alloy polyurethane coating | M20×1.5 | ||||
| B | Low copper aluminum alloy polyurethane coating | 1/2-14 NPT | ||||
| C | Stainless steel | M20×1.5 | ||||
| D | Stainless steel | 1/2-14 NPT | ||||
| Code | Pressure connection | |||||
| L1 | 1/4NPT-18 Internal thread（excluding waist joint standard） | |||||
| L2 | 1/2NPT-14 Internal thread | |||||
| L3 | M20×1.5 External thread | |||||
| Code | Optional parts | |||||
| M4 | LCD multi – power digital display head | |||||
| B1 | Pipe bending bracket | |||||
| B2 | Plate bending bracket | |||||
| B3 | Pipe mounting bracket | |||||
| C02 | M20×1.5 nut and Φ 14 pressure short tube | |||||
| C12 | 1/2NPT-14 external thread and Φ14 pressure short tube | |||||
| C22 | 1/4NPT-18 external thread and Φ14 pressure short tube | |||||
| C32 | 1/4NPT-18 to M20×1.5 external thread | |||||
| C42 | 1/2NPT-14 to M20×1.5 external thread | |||||
| C43 | 1/2NPT-14 to 1/4NPT-18 internal thread | |||||
| C44 | 1/2NPT-14 to 1/2NPT-14 external thread | |||||
| C45 | 1/2NPT-14 to G1/2 external thread | |||||
| D1 | The side discharge valve is on the upper part | |||||
| D2 | The side discharge valve is on the upper part | |||||
| X1 | Oil ban | |||||
| Da | Flameproof ExdIIBT5Gb;(explosion-proof certificate no. : CE16.1163) | |||||
| Fa | Intrinsically safe ExiaIICT4/T5/T6Ga | |||||
Learn more about differential pressure transmitters
The differential pressure/high static pressure differential pressure transmitter is a pressure signal measured with the low pressure side as the reference end, and has two ports connected to the process pipeline.
The working principle of metal capacitive differential pressure/high static pressure differential pressure transmitter is:
When the pressure acts indirectly on the surface of the metal measuring diaphragm (elastic measuring element) of different thickness through the isolation diaphragm and the pressure guide medium. Make the diaphragm slightly deformed. The maximum deformation does not exceed 0.1mm. A high-precision measurement circuit converts this tiny deformation into a voltage signal that is linear with the differential pressure signal. After linearization and temperature compensation, a dedicated chip is used to convert this voltage signal into an industry standard 4-20mA current signal or 1-5V voltage signal.
High-precision integrated circuits adopted by the high sensitivity of the metal capacitive pressure sensor and the measuring diaphragm detection circuit. It contains linearity and temperature compensation circuit inside. So the whole transmitter can achieve high precision and high stability.
The metal capacitive pressure sensor has extremely high anti-overload performance and excellent performance in micro-pressure measurement. It is also a must-have product for various complex industrial environments.
If we classify our capacitive differential pressure transmitters, there are mainly the following four types:
- Intelligent differential pressure transmitter;
- High static pressure differential pressure transmitter;
- Micro differential pressure transmitter;
- Remote differential pressure transmitter.
If classified from different working principles. There are many types of differential pressure transmitters. For example, there are seven or eight types of resistance strain gauge differential pressure transmitters, piezoresistive differential pressure transmitters, capacitive differential pressure transmitters, and semiconductor strain gauge differential pressure transmitters.
Among them, capacitive differential pressure transmitters and piezoresistive differential pressure transmitters are the most widely used, low-priced, and relatively high-precision.
- Measure differential pressure.
The differential pressure transmitter is a differential pressure transmitter that measures differential pressure values. Differential pressure used to measure the level of liquids, gases or vapors. Then convert the differential pressure signal into 4-20mA DC signal output. The intelligent pressure transmitter then displays the differential pressure value through the display instrument.
Differential pressure transmitters are different from ordinary pressure transmitters in that they all have 2 pressure ports. Differential pressure transmitters are generally divided into positive pressure end and negative pressure end. The pressure at the positive pressure end of the differential pressure transmitter should be greater than the pressure at the negative pressure end to be measured.
- Differential pressure measurement of special media: differential pressure transmitter with capillary, flange diaphragm, etc.;
Viscous medium at high temperature
easily crystallized medium
Sedimentary media with solid particles or suspended matter
Strong corrosive or highly toxic media
Occasions with high sanitation requirements
- Flow measurement
In the industrial production process, there are many instruments for measuring flow. However, differential pressure flowmeters account for the largest proportion and are most widely used. Its structure is simple and reliable, there are no moving parts, it is not afraid of vibration, and it can withstand high temperature, low temperature and other harsh conditions.
A differential pressure flowmeter has a primary element and a secondary element. Base elements are usually designed to create a pressure differential as flow increases. There are many types of basic elements, the most common being orifice plates, venturis, orifices and pitot tubes.
The secondary element of a differential pressure flowmeter is the differential pressure transmitter, whose role is to measure the differential pressure produced by the primary element as accurately as possible. Of particular importance is that differential pressure measurements are not affected by changes in fluid pressure, temperature, or other characteristics such as ambient temperature. A good differential pressure transmitter is capable of accurately measuring differential pressure independently of other changing parameters and reliably transmitting a signal to represent the differential pressure.
- Measure liquid level
The differential pressure level transmitter is measured by the principle that the pressure difference between the upper and lower flanges = the pressure generated by the liquid.
It is mainly used for liquid level measurement of closed pressure vessels.
Because the gas phase pressure in the container has an influence on the static pressure. Therefore, only the differential pressure transmitter can be used to measure the differential pressure value between the gas and liquid phases to know the liquid level.
If the container under test is open, the gas phase pressure is atmospheric pressure. Then the negative pressure chamber of the differential pressure gauge can be ventilated to the atmosphere. At this time, the pressure transmitter can also be used to directly measure the level of the fish liquid.
- Density measurement
Using a differential pressure transmitter to measure density is based on the theoretical formula △P=pgh, and p=△P/gh.
That is, the static pressure of a liquid column at a certain height is proportional to the density of the liquid.
By measuring static pressure, the purpose of measuring density is achieved.
It is widely used in petrochemical catalytic cracking units, and it is equipped with a backflushing system to measure the catalyst density.
If you cannot find an answer to your question in our Differential Pressure Transmitter, you can always contact us and we will be with you shortly.
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Differential pressure transmitter is a very common type of thermal measuring instrument in the field of industrial production. It is mainly used to measure physical parameters such as pressure, liquid level and flow of liquid medium.
At present, in industrial automation production equipment, the application range of differential pressure transmitter is more and more extensive.
Sino-Inst is a manufacturer of differential pressure transmitters. We supply differential pressure transmitters for a long time, and the price is advantageous.
If you need to configure a differential pressure transmitter, or if you have any questions about the technology of the differential pressure transmitter, please feel free to contact our sales engineers.
Capacitive Differential Pressure Transmitter Manufacturer | Sino-Inst
Differential Pressure Transmitter is a high-precision intelligent on-site differential pressure detection instrument. It is used to measure the parameters of differential pressure, pressure and liquid level of various media in the state of liquid, gas and steam. And convert the measured differential pressure parameters into 4-20mA standard electrical signal output. At the same time, it adopts the HART protocol and has the function of communicating with the handheld device or the host computer. The transmitter has output parameter configuration function, which can meet the needs of different users. It can accurately measure differential pressure, liquid level, vacuum and specific gravity.
Product SKU: SI-3151DP Differential Pressure Transmitter - Capacitive
Product Brand: Sino-Inst
Product Currency: USD
Product Price: 225.00
Price Valid Until: 2029-09-09
Product In-Stock: InStock
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