Monocrystalline silicon pressure transmitter

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 inherently safe, explosion-proof, and comes with multiple isolation diaphragm structures and process connection standards. It 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

Constructed using the piezoresistive effect of single crystal silicon. Using a single crystal silicon wafer as the elastic element, a set of equivalent resistors are diffused in a specific direction on the single crystal silicon film using integrated circuit technology, and the resistors are connected into a bridge. The single crystal silicon wafer is placed inside the sensor cavity. When the pressure changes, the single crystal silicon undergoes strain, causing the strain resistance directly diffused 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

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), can be set at 0.075% for special requirements

Long term stability

Exceeding 0.15% F.S annually

Better than 0.2% F.S in five years

temperature range

Allowable medium temperature: (-40~120) ℃

Allowable ambient temperature: (-40~85) ℃

Allowable storage temperature: (-40~85) ℃

Temperature influence

Relative to 25 ℃: ≤± 0.4% standard range

Damping time

0~40S continuously adjustable

Anti vibration: 2g 1000HZ ± 0.05% g

Impact resistance: 50g 11mesc

Electromagnetic compatibility characteristics: compliant with IEC801 standard

Sensor allows overpressure: 3 times the standard range pressure

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

Full degree z.ui large alarm current range: 21mA

Start time: 3 seconds without preheating required

Materials in contact with the medium

Process connectors: Stainless steel 316, Hastelloy C

Sensor diaphragm: stainless steel 316, Hastelloy C

Non contact materials 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 grade Ex d Ⅱ C T5, intrinsically safe Ex ia Ⅱ C T5

Allowable environmental humidity: 100% RH