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