Single crystal silicon pressure transmitter
Description
Monocrystalline silicon pressure transmitter has 0.075% ultra-high measuring accuracy, 100:1 wide range ratio, high stability, fast response speed, high reliability, HART communication function is convenient for manual debugging, with intrinsically safe, flameproof type, optional a variety of isolation diaphragm structure, a variety of process connection standards, Applicable to micro pressure, absolute pressure, negative pressure, high temperature and high pressure, low temperature and corrosion conditions pressure measurement.
I. Working principle of monocrystalline silicon pressure transmitter
It is composed by piezoresistive effect of monocrystalline silicon. The monocrystalline silicon sheet is used as the elastic element, and a group of equivalent resistors are diffused in a specific direction of monocrystalline silicon by the technology of integrated circuit on the monocrystalline silicon film, and the resistors are connected into a bridge, and the monocrystalline silicon sheet is placed in the sensor cavity. When the pressure changes, the monocrystalline silicon generates strain, so that the strain resistance directly diffused on it changes in proportion to the measured pressure, and then the corresponding voltage output signal is obtained by the bridge circuit.
Technical parameters of monocrystalline silicon pressure transmitter
Measuring range
Relative pressure: 0 ~ 400Pa ~ 35MPa
J.D pressure: 0 ~ 1.75KPa ~ 35MPa
Signal output
4-20mA +HART Communication Protocol (Two-wire system)
Measurement accuracy
Comprehensive error: 0.1% (including linearity, repeatability and hysteresis), 0.075% for special requirements
Long-term stability
Better than 0.15%F.S per year
Five years better than 0.2%F.S
Temperature range
Allowable medium temperature: (-40 ~ 120) ℃
Allowable ambient temperature: (-40 ~ 85) ℃
Allowable storage temperature: (-40 ~ 85) ℃
Temperature effect
Relative to 25℃ : ≤±0.4% standard range
Damping time
0 to 40S adjustable continuously
Anti-vibration: 2g 1000HZ ±0.05%g
Impact Resistance: 50g 11mesc
Electromagnetic compatibility: comply with IEC801 standard
Sensor allows overpressure: 3 times the pressure of standard range
Zero z.u small alarm current range: 3.8mA
Full degree z.u large alarm current range: 21mA
Startup time: 3S without preheating
Part of the material in contact with the medium
Process connector: Stainless steel 316, Hastelloy C
Sensor diaphragm: 316 stainless steel, Hastelloy C
Part of the material that is not in contact with the medium
Case: Die-cast aluminum with epoxy coating
Sensor filling liquid: silicone oil anaerobic oil
Field display: LCD 3 1/2 precision digital display LCD analog strip display
Protection level :IP66
Weight: About 1Kg
Explosion-proof class Explosion-proof type Ex dⅡ C T5, intrinsic safety type Ex ia ⅡC T5
Allowable ambient humidity :100%RH
Message
