The monocrystalline silicon pressure transmitter has a high measurement accuracy of 0.075%, a 100:1 wide range ratio, high stability, fast response speed, and high reliability. It comes with a built-in Hart communication function for easy manual debugging. It is of intrinsic safety, explosion-proof, and can be equipped with multiple isolation membrane structures. It has multiple process connection standards and is suitable for pressure measurement under micro pressure, absolute pressure, negative pressure, high temperature and high pressure, low temperature and corrosion conditions.
1、 Working principle of monocrystalline silicon pressure transmitter
Composed by utilizing the piezoresistive effect of monocrystalline silicon. Using a single crystal silicon wafer as an elastic element, a set of equivalent resistors is diffused in a specific direction of the single crystal silicon using integrated circuit technology on the single crystal silicon film, and the resistors are connected into a bridge circuit. The single crystal silicon wafer is placed in the sensor cavity. When the pressure changes, monocrystalline silicon generates strain, causing the strain resistance directly diffusing on it to change proportionally to the measured pressure, and then the corresponding voltage output signal is obtained by the bridge circuit.
2、 Technical parameters of monocrystalline silicon pressure transmitter
measuring range
Relative pressure: 0-400Pa-35MPa
******Pressure: 0-1.75 KPa to 35 MPa
signal output
4-20mA+Hart communication protocol (two wire system)
measurement accuracy
Comprehensive error: 0.1% (including linearity, repeatability, hysteresis), special requirements can be set at 0.075%
Long term stability
Better than 0.15% F.S per year
Better than 0.2% F.S in five years
temperature range
Permissible medium temperature: (-40~120) ℃
Permissible ambient temperature: (-40~85) ℃
Permissible storage temperature: (-40~85) ℃
Temperature influence
Relative to 25 ℃: ≤ ± 0.4% of standard range
Damping time
0~40S continuously adjustable
Anti vibration: 2g 1000HZ ± 0.05% g
Impact resistance: 50g 11mesh
Electromagnetic compatibility characteristics: comply with IEC801 standard
Sensor allows overpressure: 3 times the standard range pressure
Zero point * * * Small alarm current range: 3.8mA
Full scale * * * Large alarm current range: 21mA
Start time: 3 seconds without preheating
Materials in contact with the medium
Process connectors: stainless steel 316, Hastelloy C
Sensor diaphragm: stainless steel 316, Hastelloy C
Materials that are not in contact with the medium
Shell: Die cast aluminum strip with epoxy resin coating
Sensor filling fluid: silicone oil anaerobic oil
On site display: LCD 3 1/2 precision digital display LCD analog strip display
Protection level: IP66
Weight: approximately 1Kg
Explosion proof level Ex d Ⅱ C T5, intrinsic safety Ex ia Ⅱ C T5
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