Analysis of Causes for Abnormal Display of Diffused Silicon Pressure Transmitters

When the GPD-GPD25 pressure transmitter displays abnormally，troubleshooting the diffused silicon sensor is critical。This article focuses on common issues of pressure transmitter models such as KYB-C3 and VEGABAR-A，and provides a detailed analysis of the working principle，fault handling，and calibration methods of diffused silicon liquid and gas pressure sensors，helping technical evaluation personnel quickly locate problems and ensure stable equipment operation。

As an important measuring component in industrial automation，the stability of diffused silicon pressure transmitters directly affects production safety and efficiency。Taking the KYB-C3 pressure transmitter as an example，abnormal display usually appears as zero drift，unstable output signal，or no response at all。Technical evaluation personnel should make a preliminary assessment from three dimensions：power supply voltage，medium characteristics，and mechanical damage：first，check whether the 24V DC power supply fluctuates by more than ±10%；second，confirm whether the measured medium has corroded the sensor diaphragm；finally，check whether the pressure guiding tube is blocked or leaking。

It is worth noting that the working principle of the DW803-10MPa-C-1-A-Z-0-3 pressure transmitter is based on the silicon piezoresistive effect。When the ambient temperature changes abruptly，changes in the piezoresistive coefficient of the silicon crystal may cause output deviation。In this case，temperature compensation calibration should be performed according to the manual。Especially when the operating temperature exceeds the range of -20℃～+65℃，the rationality of the sensor selection needs to be reassessed。For scenarios requiring high-precision measurement，it is recommended to select products with a comprehensive accuracy of 0.02%，such as Domestic Weighing Sensor MLC304 Tension and Compression S-Type Stainless Steel Weighing Sensor。

Typical Fault Codes and Handling Solutions

The common Err01 error code of the VEGABAR-A pressure transmitter usually indicates that the sensor is over range。The handling steps should include：immediately stop pressurization and vent the pipeline；check whether the range setting matches the actual operating conditions（for example，using a 10MPa range sensor to measure a 15MPa medium）；use a multimeter to measure the bridge resistance，and the normal value should be within the range of 350±3Ω。If the resistance is abnormal，the silicon diaphragm may have undergone plastic deformation。

When the ST-LBIIIEO pressure transmitter displays a "CAL" calibration abnormality，operate according to the following procedure：connect a standard pressure source and warm up for 30 minutes；enter the calibration menu through the HART communicator；complete zero point（4mA）and full-scale（20mA）calibration in sequence。During calibration，it should be noted that the error of the applied standard pressure value should not exceed 1/3 of the sensor accuracy class。For example，when the accuracy class of the KYB-C3 pressure transmitter is 0.1%，the accuracy of the standard pressure source must be better than 0.03%。

Key Technical Points for Sensor Calibration

The calibration of the GPD-GPD40 pressure transmitter must strictly comply with JJG882-2019 Verification Regulation for Pressure Transmitters。Key points include：ambient temperature controlled at 23±2℃；humidity 45%~75%RH；the standard instrument and the sensor under test should be on the same horizontal plane。For diffused silicon liquid pressure sensors，special attention should also be paid to medium temperature compensation。A three-point calibration method（0%，50%，100% range）is recommended to improve linearity。

In the field of force measurement，calibration methods are also critical。Taking the MLC304 stainless steel weighing sensor as an example，it adopts 6-point linear compensation technology and applies standard weights through a dedicated loading device，ensuring a comprehensive accuracy of 0.02% within the 5kg～20t range。This high-precision calibration method is also applicable to pressure transmitter application scenarios with demanding measurement requirements。

Preventive Maintenance and Alternative Solutions

Establishing a regular maintenance plan can effectively extend the service life of the DG1210-BZ-A-2-30/FZ pressure transmitter。Monthly inspections are recommended：sealing performance of the pressure guiding tube（soap water detection method）；corrosion of the sensor body（focus on checking the 316L stainless steel diaphragm）；oxidation level of electrical connection terminals。Quarterly tasks should include：zero-point calibration；insulation resistance test（≥5000MΩ）；safe overload check（not exceeding 150% rated pressure）。

When the original sensor fails frequently，an upgrade solution can be considered。For example，replace the GPD-GPD25 with the GPD-GPD40 series，which uses an improved diffused silicon chip and reduces temperature influence to ±0.02%/10℃。For scenarios that require simultaneous measurement of tension and compression forces，the bidirectional measurement characteristics of Domestic Weighing Sensor MLC304 can be evaluated。Its alloy steel material can adapt to harsher industrial environments。

Technical Parameter Comparison and Selection Recommendations

The above table comparison shows that different sensors have different focuses in terms of accuracy and adaptability to operating conditions。Technical evaluation personnel should select according to actual requirements：for process control，give priority to the stability of KYB-C3；for sanitary applications，choose the corrosion-resistant design of VEGABAR-A；for high-precision force measurement，the alloy steel structure of MLC304 is recommended。

Summary and Technical Support

Troubleshooting diffused silicon pressure transmitters requires systematic thinking，eliminating possible causes step by step from the power supply，medium，mechanical structure，to electronic components。Mastering the calibration methods in the KYB-C3 pressure transmitter manual and understanding the working principle of the DW803 series can significantly improve problem-solving efficiency。For measurement requirements under special operating conditions，you can contact our technical team for customized solutions，or visit the product page to learn the detailed technical parameters of the MLC304 Stainless Steel Weighing Sensor。Call 400-xxx-xxxx now for professional support，ensuring that your measurement system is always in optimal condition。