How do diffused silicon pressure sensors achieve precise measurement？Using the P-P761 transmitter as an example，this article illustrates its working principle and analyzes the key performance of models such as KYB-C3 in liquid and gas pressure measurement。As a professional sensor manufacturer，Xi'an Shenghongchuang will guide you through the selection points and application scenarios of diffused silicon sensors，helping you purchase genuine equipment。

Working Principle of Diffused Silicon Pressure Sensors

The core of a diffused silicon pressure sensor lies in its sensing element——the silicon diaphragm。When fluid pressure acts on the silicon diaphragm，the diaphragm undergoes slight deformation，causing changes in the resistance values of the Wheatstone bridge embedded in it。This change is converted into a standard electrical signal（such as 4-20mA or 0-5VDC）through a signal conditioning circuit，thereby enabling accurate measurement of pressure values。Taking the P-P761 transmitter as an example，it adopts laser calibration technology，with temperature drift controlled within ±0.05%FS/℃，ensuring measurement stability within the medium temperature range of -30℃~+85℃。

Selection Guide for Models Such as KYB-C3 and P-P764

When selecting a diffused silicon pressure sensor，three key parameters should be prioritized：measuring range，accuracy class，and medium compatibility。The KYB-C3 pressure transmitter is suitable for gas measurement from 0~60MPa，with an accuracy of class 0.25；while the P-P764 model is designed for corrosive liquids and uses a 316 stainless steel isolation diaphragm。For special environments such as ships，China-made aviation plug type pressure transmitter PPM-T229B has passed IP65 protection certification，and its rod-shaped structure is particularly suitable for installation in hydraulic systems。During selection，attention should also be paid to matching the electrical connection method（aviation plug/DIN connector）with the output signal type（two-wire/three-wire）。

Comparative Analysis of Technical Performance

Common Application Scenarios and Misconceptions

Diffused silicon sensors are widely used in petrochemical，environmental protection，building automation，and other fields，but users often have two common misconceptions：one is ignoring the impact of medium corrosiveness on sensor service life，for example，ceramic piezoresistive types should be selected for strong acid environments；the other is confusing the requirements for gauge pressure and absolute pressure measurement。The P-P974 transmitter adopts a special packaging process and can withstand corrosive gases such as hydrogen sulfide，while the P-P981 model is ATEX certified and suitable for explosive environments。

Why Choose Xi'an Shenghongchuang

As a sensor manufacturer with 15 years of experience，we provide a full range of solutions from the basic P-P761 model to high-end customized PPM-T229B products。All products have passed ISO9001 quality management system certification and come with a three-year warranty service。For special operating conditions，our engineering team can provide free selection consultation to ensure that you obtain the most suitable China-made aviation plug type pressure transmitter PPM-T229B or other customized products。