Differential pressure transmitters often have some faults during the measurement process. The timely determination and analysis of faults is crucial for ongoing production. Based on the experience in routine maintenance, we summarize some judgment analysis methods and analysis processes.
1. Investigation method: Review the fire, smoke, odor, power supply change, lightning strike, moisture, misoperation, and mis-maintenance before the fault occurs.
2. Intuitive method: observe the external damage of the circuit, the leakage of the pressure guiding tube, the overheating of the circuit, the state of the power supply switch, and the like. 3. Detection method:
(1) Open circuit detection: separate the suspected fault part from other parts to see if the fault disappears. If it disappears, determine the fault. Otherwise, you can find the next step. For example, the intelligent differential pressure transmitter cannot be normal. Communication, the power can be disconnected from the meter body, the transmitter is powered on by field power supply to communicate whether to see if the cable is superimposed about 2 kHz electromagnetic signal and interfere with communication.
(2) Short-circuit detection: In the case of ensuring safety, the relevant part of the circuit is directly short-circuited. For example, if the output value of the differential transmitter is too small, the pressure-conducting tube can be disconnected, and the differential pressure is directly from the outside of the pressure-receiving valve. The signal is directly led to both sides of the differential pressure transmitter, and the transmitter output is observed to determine the plugging and leakage connectivity of the pilot line.
(3) Replacement detection: Replace the part suspected of being faulty and judge the fault location. For example, if the transmitter board is suspected to be faulty, you can temporarily replace it to determine the cause.
(4) Division detection: divide the measurement loop into several parts, such as: power supply, signal output, signal transmission, signal detection, sub-section inspection, from simple to complex, from the table and inside, narrow the scope, find out Fault location
1. Investigation method: Review the fire, smoke, odor, power supply change, lightning strike, moisture, misoperation, and mis-maintenance before the fault occurs.
2. Intuitive method: observe the external damage of the circuit, the leakage of the pressure guiding tube, the overheating of the circuit, the state of the power supply switch, and the like. 3. Detection method:
(1) Open circuit detection: separate the suspected fault part from other parts to see if the fault disappears. If it disappears, determine the fault. Otherwise, you can find the next step. For example, the intelligent differential pressure transmitter cannot be normal. Communication, the power can be disconnected from the meter body, the transmitter is powered on by field power supply to communicate whether to see if the cable is superimposed about 2 kHz electromagnetic signal and interfere with communication.
(2) Short-circuit detection: In the case of ensuring safety, the relevant part of the circuit is directly short-circuited. For example, if the output value of the differential transmitter is too small, the pressure-conducting tube can be disconnected, and the differential pressure is directly from the outside of the pressure-receiving valve. The signal is directly led to both sides of the differential pressure transmitter, and the transmitter output is observed to determine the plugging and leakage connectivity of the pilot line.
(3) Replacement detection: Replace the part suspected of being faulty and judge the fault location. For example, if the transmitter board is suspected to be faulty, you can temporarily replace it to determine the cause.
(4) Division detection: divide the measurement loop into several parts, such as: power supply, signal output, signal transmission, signal detection, sub-section inspection, from simple to complex, from the table and inside, narrow the scope, find out Fault location
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