YM-1QQ Pressure Transmitter Working Principle Diagram：Analysis of the Core Technology of Diffused Silicon Sensors

As a key device in the field of industrial automation，the YM-1QQ pressure transmitter is built around diffused silicon sensor technology。This article provides an in-depth analysis of the operating principle of diffused silicon liquid and gas pressure sensors，and illustrates their internal structure in detail，helping information researchers and operators fully understand the technical characteristics，purchasing considerations，and common troubleshooting methods of YM-1QQ and other series products，providing a professional reference for the selection of flow control equipment。

1、Core Technical Principle of Diffused Silicon Sensors

The diffused silicon pressure sensor is the core component of the YM-1QQ pressure transmitter，and its operating principle is based on the piezoresistive effect。When external pressure acts on the sensor，the silicon diaphragm undergoes slight deformation，causing the resistance value of the Wheatstone bridge embedded on the silicon diaphragm to change。This change is converted into a standard electrical signal（such as 4-20mA or 0-10V）through a precision circuit，enabling accurate pressure measurement。

Compared with traditional ceramic or metal strain gauge sensors，diffused silicon sensors offer high sensitivity，good stability，and excellent temperature characteristics。Taking YM-1QQ as an example，its typical accuracy can reach ±0.1%FS，and temperature drift is controlled within ±0.02%FS/℃，making it particularly suitable for demanding industrial process control applications。

2、Structural Analysis of the YM-1QQ Pressure Transmitter

The YM-1QQ pressure transmitter adopts a modular design，mainly including the following core components：

1. Pressure connection：usually made of 304 stainless steel，with a standard G1/4" male thread configuration，allowing direct installation on pipelines

2. Sensing unit：includes a diffused silicon chip，temperature compensation circuit，and signal conditioning circuit

3. Electronics compartment：built-in microprocessor for signal processing，linearization，and communication functions

4. Wiring terminals：support multiple output modes，including analog signals，switching signals，and digital communication

In practical applications，users can select different specifications and models according to their needs，for example，the YM-130 pressure transmitter is suitable for high-pressure applications，while the YM-1XH is specially designed for corrosive media。

3、Calibration and Adjustment of Diffused Silicon Pressure Sensors

Proper calibration is the key to ensuring the measurement accuracy of the YM-1QQ pressure transmitter。The standard calibration process includes：

1. Zero-point calibration：adjust the output signal to 4mA（or 0V）under no-pressure conditions

2. Full-scale calibration：apply the rated pressure and adjust the output to 20mA（or 10V）

3. Mid-point verification：check whether the linearity meets the accuracy class specified for the YD-322 pressure transmitter

For intelligent transmitters such as YMP-YMP489，remote calibration can also be performed via the HART protocol or RS485 interface，greatly simplifying on-site operation procedures。

4、Common Fault Diagnosis and Troubleshooting Methods

According to the technical manual of the YM-115 pressure transmitter，operators can refer to the following troubleshooting guide：

For models with display functions such as MBS-G3131，the fault type can also be quickly identified through the panel indicator lights，improving maintenance efficiency。

5、Selection Guide for Pressure Control Equipment

When selecting pressure transmitters such as YM-1KGR，the following factors should be comprehensively considered：

1. Measuring medium：corrosive media require special materials（such as Hastelloy）

2. Pressure range：select an appropriate range according to actual operating conditions，and it is recommended that the working pressure be between 30-80% of the range

3. Accuracy requirements：±0.5%FS can be selected for general process control，while precision measurement requires ±0.1%FS or higher

4. Environmental conditions：consider influencing factors such as temperature，humidity，and vibration

For applications requiring high-precision control，it is recommended to consider the China-Made HDK106 Digital Pressure Controller，which offers control accuracy up to ≤±0.5%FS，and supports 4-digit LED display and multiple switching signal outputs。

6、Summary and Recommendations

With the excellent performance of its diffused silicon sensor，the YM-1QQ pressure transmitter has become an ideal choice in the field of flow control。By understanding its operating principle，mastering calibration methods，and becoming familiar with troubleshooting techniques，operators can fully utilize the equipment performance and ensure the stable operation of industrial processes。

As a professional sensor manufacturer，Xi'an Shenghongchuang Instruments Co., Ltd. can provide a full range of pressure measurement solutions from YSZK-01G-C to DMK331-250-4000。If you would like to learn more technical details or obtain a product quotation，please feel free to contact our technical consultant team。