Pressure (gauge pressure)/absolute pressure transmitter is a pressure signal measured at the reference side of atmospheric pressure/vacuum with only one port connected to the process pipe and the other end connected to the atmosphere. The working principle of the metal capacitive pressure (gauge pressure)/absolute pressure transmitter is that when the pressure passes through the isolated diaphragm and the pressure conducting medium, it will indirectly act on the surface of the metal measuring diaphragm (elastic measuring element) of different thickness, so that the diaphragm will be slightly deformed and the maximum shape variable will not exceed 0.1mm.A high-precision circuit that measures the deformation of the diaphragm converts this tiny deformation into a voltage signal proportional to the pressure. After linearization and temperature compensation processing, the voltage signal is converted into the industry-standard 4-20ma current signal or 1-5v voltage signal using a dedicated chip. The high sensitivity of metal capacitive pressure sensor and the high precision integrated circuit used in the measurement diaphragm detection circuit contain linear circuit and temperature compensation circuit, so the whole transmitter can achieve high precision and high stability. The metal capacitive pressure sensor has extremely high overload resistance and excellent performance in micro-pressure measurement. It is also a must choice product in various complex industrial environments.
SMT3151GP/AP Pressure/Absolute Pressure Transmitter
Description
Pressure (gauge pressure)/absolute pressure transmitter is a pressure signal measured at the reference side of atmospheric pressure/vacuum with only one port connected to the process pipe and the other end connected to the atmosphere.
The working principle of the metal capacitive pressure (gauge pressure)/absolute pressure transmitter is that when the pressure passes through the isolated diaphragm and the pressure conducting medium, it will indirectly act on the surface of the metal measuring diaphragm (elastic measuring element) of different thickness, so that the diaphragm will be slightly deformed and the maximum shape variable will not exceed 0.1mm.A high-precision circuit that measures the deformation of the diaphragm converts this tiny deformation into a voltage signal proportional to the pressure. After linearization and temperature compensation processing, the voltage signal is converted into the industry-standard 4-20ma current signal or 1-5v voltage signal using a dedicated chip.
The high sensitivity of metal capacitive pressure sensor and the high precision integrated circuit used in the measurement diaphragm detection circuit contain linear circuit and temperature compensation circuit, so the whole transmitter can achieve high precision and high stability.
The metal capacitive pressure sensor has extremely high overload resistance and excellent performance in micro-pressure measurement. It is also a must choice product in various complex industrial environments.
Technical Performance
Use object: liquid, gas or steam
Measuring range: see the selection specification table
Output signal: 4-20ma dc. Output, superimposed HART protocol digital signal (two-wire system)
Power source: external power supply 24V dc. Power supply range 12V ~ 45V
Load characteristics:
Installation in dangerous places:
Flameproof ExdIIBT5Gb;(explosion-proof certificate no. :CE16.1163)
Intrinsically safe ExiaIICT4/T5/T6Ga;（explosion-proof certificate no. : CE15.2354X） ;
Migration features:
At the minimum range (the range compression ratio is 40:1), the maximum positive transfer zero point is 39/40 times the upper limit of the range, the maximum negative transfer zero point can be the lower limit of the range, the absolute pressure transmitter has no negative transfer.(regardless of the output form, the upper and lower limits of the range shall not exceed the limit of the range after positive and negative migration)
Temperature range:
Electronic circuit board work in: - 40 ~ 85 ℃;
Sensitive components work in: - 40 ~ 104 ℃;
Storage temperature: - 40 ~ 85 ℃;
With digital display: - 25 ~ 75 ℃ (run);
- 40 ~ 85 ℃ (no damage);
Relative humidity: 0 ~ 95% (no dew and frost) Overpressure limit: add 0(absolute pressure) ~ 13MPa (or the upper limit of 1.5 times the range) pressure transmitter is not damaged; The normal working pressure is from 0kPa(absolute pressure) to the upper limit of the range.
Volume change: less than 0.16cm3
Damping：The time constant is adjustable from 0.2 to 32.0s.
Startup time: 3s, no preheating required.
Technical Index
Accuracy: ± 0.1%, ±0.075%
Stability: ± 0.1% of the maximum range for 12 months
Temperature: including zero and range for maximum temperature error of ±0.2% / 20 ℃
Power supply impact: less than 0.005% / V of the output range.
Vibration effect: in any axial direction, the frequency is 200Hz, and the error is ±0.05% / g of the maximum range.
Load effect: as long as the input transmitter voltage is higher than 12V, there is no load effect in the load working area.
Influence of installation location: zero error of no more than 0.25kPa can be generated at the maximum, which can be eliminated by correction without any impact on the range; The measuring body has no influence on relative flange rotation.
(non-removable, 316 stainless steel isolation diaphragm and other standard test conditions.)
Application and type selection：
Common pressure transmitter is the most commonly used test instrument in industrial process control. It is widely used in various automatic control systems, such as aerospace, military, petrochemical, chemical, oil Wells, electric power, ships, building materials, pipelines and many other industries.Generally used in liquid, gas or steam pressure or absolute pressure measurement, medium temperature is not too high, corrosion is not strong, viscosity is not high, not easy to crystallize and other environments.
Lectotype attention:
Before selecting the type, the user shall make clear the temperature, corrosion, measuring range, explosion proof and oil forbidden treatment of the medium under test. For the medium that is easy to crystallize or thicken, the diaphragm flange connection shall be tested.
SM3151GP/AP Pressure/absolute pressure transmitter selection specification table
Selection example：3151GP4SF22AL1M4B3X1 0～20kPa