Handling of common faults in temperature transmitters

Temperature transmitters, which cause malfunction of the temperature transmitter due to improper operation or interference factors during use. In addition to power and hardware circuit failures, faults in temperature transmitter applications provide correct alarm information. The "!" mark is placed on the upper right of the display of these messages. Let us introduce the handling of common faults in temperature transmitters.
1) Meter wireless
a) Check if the power is turned on;
b) Check if the power fuse is intact;
c) Check if the power supply voltage meets the requirements;
d) Check if the display contrast adjustment can be adjusted and adjusted to fit;
e) If the above three items a), b), and c) are normal, and the display of item d) cannot be adjusted for the wrong condition, return the converter to the factory for repair.
2) Excitation alarm
a) Whether the excitation wiring EX1 and EX2 are open;
b) Whether the total resistance of the sensor excitation coil is less than 150Ω;
c) If both a) and b) are normal, the converter is faulty.
3) Empty tube alarm
a) Measure whether the fluid is filled with the sensor measuring tube
b) short-circuit the converter signal input terminals SIG1, SIG2 and SIGND with wires. At this time, if the "empty pipe alarm" prompt is canceled, the converter is normal, it may be that the conductivity of the measured fluid is low and the air traffic control threshold is empty. The pipe range setting is incorrect.
c) Check if the signal connection is correct;
d) check if the sensor electrode is normal;
1 to make the flow zero, the observation shows that the conductance ratio should be less than 100%;
2 In the case of flow, the resistance of the terminals SIG1 and SIG2 to SIGGND should be less than 5kΩ (measured for the medium, measured with a pointer multimeter, and the charging and discharging phenomenon of the measurement process can be seen).
e) Use a multimeter to measure the direct DC voltage of DS1 and DS2 should be less than 1V. Otherwise, the sensor electrode is contaminated and should be cleaned.
4) High limit alarm
The upper limit alarm indicates that the output current and output frequency or pulse are out of limits. After the flow range is increased, the upper limit alarm is cancelled.
5) Lower limit alarm
The upper limit alarm indicates that the output current and output frequency or pulse are out of limits. After the flow range is reduced, the upper limit alarm is cancelled.

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