Illustrated Explanation of the High-Precision Pressure Detection Principle of Diffused Silicon Sensors

The XMLK-C21 pressure transmitter adopts advanced diffused silicon sensor technology to achieve high-precision pressure detection. This article illustrates its working principle and answers key questions such as how to select and apply diffused silicon liquid and gas pressure sensors, helping operators gain an in-depth understanding of this core technology.

Core Structure and Working Mechanism of Diffused Silicon Sensors

As the core component of the XMLK-C21 transmitter, the working principle of the diffused silicon pressure sensor is based on the piezoresistive effect. Four pressure-sensitive resistors are formed on a monocrystalline silicon substrate through ion implantation technology, constituting a Wheatstone bridge structure. When the pressure of the measured medium acts on the isolation diaphragm, it is transmitted to the silicon sensing element through the fill fluid, causing the resistance value to change, and the bridge outputs a millivolt-level signal proportional to the pressure.

Key technical parameters include:

• Operating temperature range: -40℃~125℃（standard type）
• Overload capacity: 150%FS
• Long-term stability: ±0.1%FS/year
• Media compatibility: 316L stainless steel isolation diaphragm

Analysis of Typical Application Scenarios for XMLK-C21

This model is particularly suitable for liquid and gas pressure monitoring in industrial processes, and performs outstandingly in the following scenarios:

Key Factors for Selecting Diffused Silicon Sensors

For the selection of different models such as PH-PH101 and DG1300, the following should be重点considered:

1. Medium characteristics: Corrosive media require the selection of a Hastelloy diaphragm
2. Pressure range: The measuring range should be 1.5 times the working pressure
3. Output signal: 4-20mA is suitable for long-distance transmission
4. Process connection: 1/4NPT thread is a universal standard

Industry Solutions and Quality Verification

Series products such as PT124B-210 manufactured by Xi'an Shenghongchuang Instrumentation have passed:

• CE certification（EN 61298-1:2008）
• RoHS compliance testing
• 72-hour aging test
• Temperature cycle test（-40℃~125℃）

Typical Questions and Technical Answers

Q: What are the advantages and disadvantages of the GT-V model?
A: The advantage is good vibration resistance, making it suitable for mobile equipment; the disadvantage is that the maximum temperature is limited to 85℃.

Q: How to verify the quality of PMI009-732?
A: It can be verified through a zero drift test（24-hour change should be<0.05%）and a step response test（response time<5ms）.

Technical Summary and Purchasing Recommendations

With its excellent stability and accuracy, diffused silicon pressure sensors have become the preferred solution for industrial measurement. It is recommended that users select industry-validated models such as XMLK-C21 and SMP131 according to actual working conditions, and give priority to manufacturers with ISO 9001 certification.

Xi'an Shenghongchuang Instrumentation provides professional technical support and customized services. Welcome to Contact Us for detailed technical solutions for models such as AT-131.