Diffused silicon pressure sensor

PC10 Series OEM Silicon Piezoresistive Pressure Core

Overview

PC10 series silicon piezoresistive pressure core is the core part (OEM) for manufacturing pressure sensors and pressure transmitters. As a high-performance pressure sensitive element, it can be easily amplified and assembled into a standard signal output. The transmitter is widely used in the process control of petroleum, chemical, metallurgy, electric power, aviation, aerospace, medical equipment, automotive, HVAC and other industries.

PC10 series is the diffusion silicon pressure sensitive chip packaged in 316L stainless steel housing, the external pressure is transmitted through the stainless steel diaphragm, internal sealed silicone oil to the sensitive chip, the sensitive chip does not directly contact the measured medium, forming the pressure measurement of the solid structure, This product can therefore be used in a variety of applications including harsh corrosive media environments.

The PC10 series uses fluororubber “O” rings for pressure sealing and is easy to install.

The company can also undertake special requirements according to the needs of users, such as all-welded structure, wide temperature compensation, high reliability, resistance to strong impact and vibration pressure sensors, especially for the defense weapons and equipment.

Features

进口 Import pressure chip

高性能 High performance, all solid state, high reliability

√ 2 year warranty

Technical performance

Bridge resistance: 3KΩ~6KΩ

Power supply: constant current 1.5mA, constant voltage 10V

Operating temperature: -45°C～125°C

Compensation range: -10°C～70°C

Housing and Diaphragm: Stainless Steel 316L

Accuracy: 0.25 %FS

Zero point: ±2mV

Full-scale: ≥100mV (typical)

Zero temperature drift: 0.02 %FS/°C

Sensitivity temperature drift: 0.02 %FS/°C

Insulation: 100MΩ/250VDC

Sealing ring: φ16×1.7mm (NBR or fluorinated rubber)

Long-term stability: 0.2% FS/year

Oil-filled: silicone oil, olive oil (hygienic)

Response time: ≤ 50μm (up to 90% FS)

Vibration: 20g/(20~5000Hz)

Durability Cycle: >100×106 FS

Range selection

G gauge pressure (ventilated gauge pressure, zero at current atmospheric pressure) Unit: MPa

Range

-0.1

-0.035

-0.02

0.02

0.035

0.1

0.25

0.4

0.6

1.0

1.6

2.5

overload%

300

300

300

300

300

200

200

200

200

200

200

200

A Absolute pressure (vacuum zero) Unit: MPa

Range

0.1

0.25

0.4

0.6

1.0

1.6

overload%

200

200

200

200

200

200

S Sealed gauge pressure (zero calibration atmospheric pressure) Unit: MPa

Range

1.0

1.6

2.5

6

10

25

40

60

100

overload%

200

200

200

200

200

150

150

150

150

D Differential pressure Unit: MPa

Range

0.02

0.035

0.1

0.25

0.4

0.6

1.0

1.6

2.5

overload%

300

300

200

200

200

200

200

200

150

external structure

25MPa or less 25MPa or more Differential pressure

instructions

1 Apply a small amount of vacuum grease to the surface of the “O” ring during installation.

2 Apply force evenly along the axial direction of the cavity and push the core into the cavity. Note that the “O” ring must not be damaged.

The 3-core diaphragm is a pressure sensitive part. Do not touch it with your fingers or hard objects during use.

4 The "O" type ring seal method is a floating type seal, and it is an absolutely reliable static seal method. It is not necessary to use any other seal method. Under normal circumstances, it can be used in a pressure environment of 40 MPa.

5 When the pressure exceeds 25MPa, it needs to be equipped with a retaining ring and the sealing pressure can reach 400MPa.

6 When assembling a small-range core, it is not easy to press hard, so that the extra force will degrade the temperature characteristics of the core.

Application Circuit

1 constant current source generating circuit

2 voltage output

3 current output

3.1 Connection with XTR105 Circuit

XTR105 circuit has two 0.8mA constant current power supply, can use any one way to power the pressure core body alone, it can also be combined together 1.6mA power supply, it is recommended to use 0.8mA power supply mode, while the pressure core power supply negative series 1 ~ 1.6KΩ ordinary resistance can be.

3.2 Connection to the XTR101 Circuit

XTR101 is a very good two-wire 4-20mA dedicated instrumentation circuit, the circuit itself has a zero adjustment function, there are two 1-mA constant current power supply, can be used to power the pressure core body with any one way, can also be combined together 2mA For power supply, 1mA power supply is recommended. At the same time, the power supply of the pressure core can be connected in series with 1～1.6KΩ common resistance.

3.3 Connection with XTR106

The XTR106 circuit is also a two-wire 4-20mA dedicated instrumentation amplifier circuit. This circuit supplies power to the sensor at a constant voltage of 5V or 2.5V, and does not work well with the pressure core. Reason: The silicon pressure sensor adopts the constant current power supply to carry on the temperature compensation best, under the constant pressure the work temperature drifts greatly. It is recommended that users use the same price circuit XTR105.

3.4 Connection with Universal Op Amps

The general-purpose op amp design of the two-wire 4-20mA performance with a dedicated instrument amplifier circuit such as XTR105, XTR106, AD693, AM400, AM401, etc. there is still a certain gap, but the price is cheap. As shown in the following figure, the circuit uses a general-purpose four-op-amp circuit. It is recommended to supply 0.75mA constant current to the pressure core.

3.5 Five-wire heart body and XTR105 circuit connection

XTR105 circuit is a very good two-wire 4-20mA dedicated instrumentation circuit, but the only drawback is that the circuit itself does not have a zero-adjustment circuit, which brings great inconvenience to the application, using the traditional sensor 4 line zero adjustment method can The purpose of zeroing is reached, but this destroys the temperature compensation balance of the sensor. In some occasions, the temperature drift will be too large, and the zero adjustment and full adjustment will have a greater impact. 5-wire sensor is based on the principle of sensor temperature compensation, zero adjustment using the sensor itself, there are many advantages:

(1) Does not affect temperature drift;

(2) Zero adjustment is convenient, zero adjustment and gain adjustment are almost unaffected;

(3) Large-scale migration is possible.

Transmitters made this way can achieve the performance of the expensive XTR101.

The schematic circuit diagram is as follows: