Illustrated Working Principle of Diffused Silicon Wheatstone Pressure Sensor

Can't understand the principle of the PT124B-211 pressure transmitter? In fact, the working principle of the diffused silicon Wheatstone pressure sensor is very simple! As the core component of flow control equipment, this high-precision sensor manufactured by Xi'an Shenghongchuang Instrumentation Co., Ltd. is explained here through a combination of text and illustrations, enabling operators to quickly master the key points for using JP-40C, WY-131 and other series products.

I. Core Working Mechanism of the Diffused Silicon Sensor

The core of the diffused silicon Wheatstone pressure sensor lies in the Wheatstone bridge structure on its silicon chip. When medium pressure acts on the 316 stainless steel isolation diaphragm, it is transmitted to the silicon sensing element through filled silicone oil, causing a change in resistance value. This change has a linear relationship with the input pressure, and after amplification by a dedicated integrated circuit, it outputs a 4～20mA standard signal.

• Pressure transmission path：medium→isolation diaphragm→silicone oil→silicon chip
• Signal conversion process：mechanical deformation→resistance change→bridge imbalance→voltage signal→standard current output
• Key compensation technology：the built-in temperature sensor corrects temperature drift error in real time, ensuring 0.05%FS/℃ accuracy under a -20～85℃ environment

II. Typical Application Scenarios of the PT124B-211 Transmitter

This model is particularly suitable for industrial environments requiring highly stable measurement, such as the petrochemical, electric power and other fields covered by Domestic General-Purpose Pressure Transmitter QYB101 Compact High-Temperature Pressure Sensor. Its M20×1.5 threaded interface can be directly installed on pipelines or vessels, and with an IP65 protection rating it adapts to complex working conditions.

III. Key Points for Operation and Maintenance

According to the WW-131 pressure transmitter maintenance manual, it is recommended to regularly perform the following operations:

1. Zero calibration：adjust the ±8% range knob under atmospheric conditions every 6 months
2. Seal inspection
3. Electrical safety：check cable insulation resistance＞100MΩ@500VDC