Single crystal silicon pressure transmitter has 0.075% ultra-high measurement accuracy, 100:1 wide range ratio, high stability, fast response speed, high reliability, built-in HART communication function to facilitate the debugging of the handheld communicator, with intrinsically safe, Explosion-proof type, optional various isolation diaphragm structures, various process connection standards, suitable for pressure measurement of micro pressure, absolute pressure, negative pressure, high temperature and high pressure, low temperature and corrosive conditions.

1. Working principle of monocrystalline silicon pressure transmitter

It is constructed by utilizing the piezoresistive effect of single crystal silicon. Using monocrystalline silicon wafers as elastic elements, the integrated circuit technology is used on the monocrystalline silicon wafers to diffuse a set of equal-value resistors in a specific direction of the monocrystalline silicon, and the resistors are connected into bridges, and the monocrystalline silicon wafers are placed on the inside the sensor cavity. When the pressure changes, the single crystal silicon produces strain, so that the strain resistance directly diffused on it changes in proportion to the measured pressure, and then the bridge circuit obtains the corresponding voltage output signal.

2. Technical parameters of single crystal 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, hysteresis), special requirements can be set as 0.075%

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

0~40S continuously adjustable

Anti-vibration: 2g 1000HZ ±0.05%g

Shock resistance: 50g 11mesc

Electromagnetic compatibility characteristics: in line with IEC801 standard

The sensor allows overpressure: 3 times the pressure of the standard range

Zero point z.ui Small alarm current range: 3.8mA

Full scale z.ui Large alarm current range: 21mA

Startup time: 3S without preheating

Part of the material in contact with the medium

Process Connections: Stainless Steel 316, Hastelloy C

Sensor Diaphragm: Stainless Steel 316, Hastelloy C

Materials that are not in contact with the medium

Housing: Die-cast aluminum with epoxy coating

Sensor filling fluid: silicone oil, anaerobic oil

On-site display: LCD 3 1/2 precision digital display LCD analog bar display

Protection class: IP66

Weight: about 1Kg

Explosion-proof grade Explosion-proof type Ex d IIC T5, intrinsically safe Ex ia IIC T5

Allowable ambient humidity: 100%RH