Analysis of the Core Technology of Diffused Silicon Hirschmann Pressure Sensors

As a core technology in the field of pressure measurement, the PT-C pressure transmitter uses a diffused silicon Hirschmann pressure sensor to achieve high-precision pressure detection through the precise strain principle. This article provides an in-depth analysis of its working principle and compares the installation and application points of different models such as PTB505 and LPB8400, helping technical evaluators master the key factors in model selection. As a professional manufacturer, Xi'an Shenghongchuang Instrumentation Co., Ltd. provides comprehensive services ranging from standard models to customized solutions.

1. Working Principle of the Diffused Silicon Hirschmann Pressure Sensor

The core of the diffused silicon Hirschmann pressure sensor lies in the design of its sensing element. The sensor uses a single-crystal silicon chip as the base material, and a piezoresistive effect layer is formed on its surface through ion implantation technology. When external pressure acts on the 316L stainless steel isolation diaphragm, the pressure is transmitted to the silicon sensing element through filling oil, causing deformation of the silicon chip. This deformation causes a change in the resistance value of the piezoresistors, and the resistance change is converted into a voltage signal output through a Wheatstone bridge.

The unique feature of the PT-C pressure transmitter lies in its temperature compensation technology. A temperature sensor is integrated inside the sensor, and real-time compensation for temperature drift is carried out through a dedicated ASIC chip, ensuring high accuracy of 0.1% over a wide temperature range of -40～+400℃. This design is particularly suitable for extreme environment applications such as aerospace and petrochemicals, and compared with traditional ceramic piezoresistive sensors, it offers better long-term stability.

2. Technical Comparison of Key Models and Selection Guide

Different application scenarios require matching sensor models:

• PTB505 series：Suitable for a measurement range of -0.1~100MPa, using an M20*1.5 threaded connection and equipped as standard with a Hirschmann connector, making it the preferred choice for the petrochemical industry
• LPB8400 series：Optimized specifically for liquid pressure measurement, with a G1/2 flange connection method, medium temperature up to 150℃, and widely used in water conservancy and marine systems
• 7MF1567 customized model：Supports customized output signals（4-20mA/0-10V）, and the compensated temperature range and pressure connection specifications can be adjusted according to customer requirements

When selecting a model, attention should be focused on three parameters: media compatibility（316L stainless steel corrosion resistance grade）, overload capacity（usually 2 times the measuring range）, and electrical connection method. For special industries such as pharmaceuticals and environmental protection, it is recommended to choose Domestic General-Purpose Pressure Transmitter P299 Hydraulic Oil Pressure Pneumatic Sensor, whose sealing performance reaches IP67 grade and can effectively prevent media leakage.

3. Key Points for Installation, Commissioning, and Troubleshooting

The correct installation method directly affects measurement accuracy:

1. For threaded installation, sealing tape must be used, and the tightening torque should be controlled at 15-20N·m
2. For flange installation, uniform force distribution should be ensured to avoid lateral stress affecting diaphragm performance
3. Shielded cables are recommended for electrical connections, with a length not exceeding 500 meters to reduce signal interference

Among common faults, about 70% are caused by improper installation. If output signal drift occurs, first check whether the power supply voltage is stable at 24VDC±10%; when the measured value is abnormal, check whether the medium has crystallized or scaled. The TS205 series is specially designed with a self-diagnostic function, and the sensor status can be judged through the output current value（4mA corresponds to zero-point fault, 20mA indicates overrange）.

4. Industry Application Solutions

In high-temperature scenarios in the metallurgical industry, it is recommended to select the P299 transmitter with a heat sink, whose isolation diaphragm manufactured with a special sintering process can withstand a medium temperature of 400℃. For smart factory requirements, the YSJ-B3 series supports the HART protocol and can be directly connected to industrial IoT systems.

Professional Technical Summary and Selection Recommendations

The core technical advantages of diffused silicon Hirschmann pressure sensors are reflected in three aspects: the excellent elastic properties of single-crystal silicon material, the high reliability brought by the fully solid-state design with no moving parts, and the advanced temperature compensation algorithm. As a national high-tech enterprise, Xi'an Shenghongchuang Instrumentation Co., Ltd. has all products certified by CE and RoHS, and provides a three-year warranty service.

When selecting models, technical evaluators are advised to give priority to material compatibility（especially for corrosive media）, the matching degree between accuracy class and actual requirements, and the degree of interface standardization. For special working conditions, the company provides technical support ranging from the 7MF1566 standard model to fully customized solutions, ensuring perfect integration of sensor performance and system requirements.

If you need detailed technical parameters of various models or customization consultation, please contact our engineering team to obtain a professional selection manual. Click to learn about Domestic General-Purpose Pressure Transmitter P299 Hydraulic Oil Pressure Pneumatic Sensor successful application cases in your industry.