Fault phenomenon: the temperature value changes too much. 
Fault analysis: 
Instrument temperature module terminal corrosion, connected to the factory test temperature sensor, the power communication is normal, the temperature response is normal, the temperature response is normal, there is no user feedback fault, but the temperature module terminal corrosion is serious, it is recommended to replace the temperature module. 
Recommended measures: 
Improper sealing of the instrument will cause water vapor to invade into the shell and affect the performance of the instrument. Customers are advised to do a good job of sealing protection as required. 
Fault analysis: 
The appearance of the instrument is normal, and the power-on meter head shows: 
ANLOG SET, verify the user feedback fault, because the output under atmospheric pressure is-0.993kPa, lower than the 4mA output, leak detection test found that the high-pressure side valve seat leakage, disassembly found that the high-pressure side valve seat can not be removed, after the replacement of the factory test flange, calibrated according to the nameplate range, the accuracy is normal, the flange is bad, need to replace the flange. 
Recommended measures: 
The equipment is calibrated by the factory. After installation, it is recommended to adjust the zero point of the gauge pressure and differential pressure transmitter immediately to eliminate the error caused by the installation position or static pressure effect. The zero adjustment can be carried out by using the on-site hand-held communicator or configuration button. 
Model number: 
TREXCHPNAWS1S. 
Failure phenomenon: 
Unable to power on, the screen will be black if the battery is less than 92%. 
Fault analysis: 
The customer accidentally dropped the floor of the TREX instrument, the board inside the instrument was broken, and the board was repaired and replaced. 
Recommended measures: 
Customers are advised to install the handbag and carry it to prevent falling.