ES-20 Pressure Transmitter Troubleshooting Guide，Essential Manual for Operators

As a core component of industrial automation systems，the stable operation of the ES-20 pressure transmitter is directly related to production safety。This article focuses on common models such as DTT01 and KRS316，and explains typical troubleshooting solutions for diffused silicon liquid and gas pressure sensors in detail，including practical tips such as wiring diagram analysis and accuracy calibration，making it an essential troubleshooting manual for operators。

I、Core Fault Types and Solutions for Diffused Silicon Pressure Transmitters

When zero drift occurs in DTT01 or KRS316 pressure transmitters，first check whether the process connection is blocked。Use a multimeter to measure the output current，if the deviation from the 4mA reference value exceeds 0.5%，zero calibration is required through the potentiometer。For the YP-P2 model，pay special attention to whether the silicone oil filling fluid is leaking——this will cause the measured value to remain more than 10% lower。During on-site handling，the pressure guide valve should be closed first，then the sensor should be removed and the diaphragm cleaned with alcohol，and after retightening the sealing ring，restore the 24V power supply according to the IP-B pressure transmitter wiring diagram。

II、Standardized Procedure for Accuracy Calibration

According to the GB/T 17614.3 standard，the AYT-AYT316 pressure transmitter requires accuracy calibration every 6 months。Use a 0.05 class standard pressure source，and perform upward and downward tests at five points：0%、25%、50%、75%、100%。If the linearity error of SK-2031 is ＞0.2%FS，the built-in temperature compensation algorithm should be enabled。Pay special attention to the temperature drift compensation of diffused silicon sensors in the -20℃~80℃ environment，which is a common issue with the HX-131 model。

III、Analysis of Typical Wiring Error Cases

An ES-20 transmitter in a chemical plant was frequently burned out，and inspection found that operators had mistakenly connected 220VAC to the 4-20mA output terminal of the KDX800。Correct wiring should refer to the IEC 61508 standard：the brown wire connects to 24VDC+，the blue wire connects to the signal positive pole，and the shielding layer is grounded at one end。For the three-wire IP-B model，the black compensation wire must be connected to the controller GND terminal。It is recommended to install a surge protector inside the control cabinet，especially in areas with frequent thunderstorms。

IV、Key Points for Preventive Maintenance

• Check the pressure guide pipe of YP-P2 every month for crystallization blockage
• Calibrate the zero point and full scale of HX100 every quarter
• Replace the O-ring seal of the DTT01 model every year
• Keep KRS316 in its original packaging when storing spare parts

V、Technical Q&A（FAQ）

Q：How to determine whether a diffused silicon sensor is damaged？
A：After disconnecting the process connection，the SK-2031 output should remain stable at 4mA±0.02mA。If it keeps fluctuating or returns to zero，the diaphragm may be ruptured。

Q：Can AYT316 and HX-131 be interchanged？
A：The range，accuracy class，and electrical interface must be verified。HX-131 adopts a special explosion-proof structure，and is not suitable for general operating conditions。

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