Analysis of Core Technologies of Diffused Silicon Pressure Transmitters

In the field of industrial process control, diffused silicon pressure sensors have become the mainstream choice thanks to their excellent stability and accuracy. As a typical representative model, the SY-PG1300-1.6MPa-GB is based on the single-crystal silicon piezoresistive effect principle, with a Wheatstone bridge structure formed on the silicon chip surface through ion implantation technology. When the medium pressure acts on the isolation diaphragm, the resistance value of the silicon chip changes linearly, and is converted by a dedicated ASIC circuit into a standard 4-20mA signal output.

A comparison of the technical parameters of the Vegabar-GV3 and PT124B series shows that diffused silicon sensors can achieve an accuracy grade of ±0.1%FS within the operating temperature range of -40~125℃, far exceeding traditional ceramic capacitive sensors. In particular, the PT124B-210-100MPa-G1/4 model adopts laser trimming technology, and its temperature drift coefficient can be controlled within ±0.01%/℃, making it suitable for extreme working conditions such as oil well measurement.

Comparison of Key Performance Indicators

Five Key Factors in Purchasing Decisions

When selecting a diffused silicon pressure transmitter, technical evaluators should focus on the following dimensions:

1. Media Compatibility Matching

The DG1300-BZ-B-2-(-0.1-0.1) model adopts a special fluororubber sealing ring design, enabling it to withstand corrosion from strong acids and strong alkalis. The HG-S3 pressure transmitter, by contrast, is equipped with a ceramic diaphragm, making it especially suitable for slurry measurement containing solid particles. According to the GB/T 17614 standard, the material selection for the parts in contact with the medium directly affects the service life of the sensor.

2. Process Connection Standards

The PT124B-210-100MPa-NPT1/4 adopts American standard tapered pipe threads, which differ in sealing from G1/4 parallel threads. During hydraulic system integration, attention should be paid to the conversion and adaptation between the ISO 1179-2 and ASME B1.20.1 standards.

Analysis of Industry Application Scenarios

In natural gas pressure regulating stations, the PT-PT300 pressure transmitter, with its 0.05% accuracy grade, can achieve custody transfer metering. Its built-in temperature compensation algorithm can automatically correct zero-point drift caused by fluctuations in ambient temperature, meeting the requirements of the GB/T 32201 energy metering specification.

For reactor pressure monitoring in chemical processes, the P200S-GB10CG12M4S explosion-proof model is more strongly recommended. This product has passed ATEX II 2G Ex ia IIC T6 certification, and its intrinsically safe circuit design can effectively prevent safety hazards caused by electric sparks.

Verification of Genuine Procurement Channels

There are cases on the market where ceramic sensors are passed off as diffused silicon products. It is recommended to identify them through the following methods:

• Check the RoHS/CE certification documents provided by the manufacturer
• Request third-party test reports to be provided (such as SIL2 functional safety certification)
• Test the zero-point temperature characteristics in practice (diffused silicon products have a flatter temperature drift curve)

As a national high-tech enterprise, Xi'an Shenghongchuang Instrument Co., Ltd. provides all pressure transmitters with unique traceability codes, supporting anti-counterfeiting verification on the official website. A three-year warranty service is also provided, covering both the sensor body and the signal processing circuit.

Technical Summary and Recommendations

Comprehensive evaluation shows that the SY-PG1300-1.6MPa-GB offers outstanding cost performance in the medium- and low-pressure range, and its fully welded structure ensures an IP67 protection rating; while the PT124B series is more suitable for high-pressure working conditions, with its specially designed O-ring seal capable of withstanding pressure shocks above 100MPa. For applications requiring intrinsic safety explosion protection, the HG-S3 model with ia-grade certification should be given priority.

It is recommended that the technical team select the corresponding pressure transmitter model according to the actual medium characteristics, accuracy requirements, and installation environment. If you need a customized selection solution or free sample testing, please contact our engineering support team for professional guidance.