Rosemount transmitters may also have some failures in the measurement process. It is also necessary to understand and analyze the faults in a timely manner in order to better apply them. Based on the daily use and maintenance experience of Rosemount transmitters, a number of methods and processes for failure analysis are summarized and summarized as follows for sharing:
The first, investigation method: need to review the Rosemount transmitter, fire, smoke, odor, power supply changes, lightning strikes, wetting, mishandling, and incorrect maintenance before the failure.
The second, intuitive method: the need to observe the Rosemount transmitter, the external damage to the circuit, the leakage of the pressure tube, the overheating of the circuit, and the status of the power switch.
The third, detection method: there are four kinds of Rosemount transmitter detection methods, namely: open circuit detection, short circuit detection, substitute detection, and segment detection method.
Disconnection detection: Separate the suspected faulty department from other departments to see if the fault disappears. If it disappears, determine the fault location. Otherwise, the next step can be found. For example: Smart differential pressure Rosemount transmitter cannot be normal Hart remote communication , The power supply can be disconnected from the meter body, and the transmitter is powered on by the method of adding power at the site to communicate to see if the cable is overlaid with an electromagnetic signal of about 2 kHz to interfere with the communication.
Short-circuit detection: In the case of ensuring safety, the relevant departments of the circuit directly shorted, such as: differential pressure Rosemount transmitter output value is too small, the pressure tube can be disconnected, directly from the pressure valve outside the differential pressure The signal is directly led to the differential pressure rosette transmitter and the output of the transmitter is observed to determine the plugging and leakage connectivity of the pilot pressure pipeline.
Alternative testing: Replace the suspected faulty department and determine the fault location. Such as: suspected Rosemount transmitter circuit board failure, you can temporarily replace a piece to determine the cause.
Branch inspection: The measurement loop where the Rosemount transmitter is located is divided into several departments, such as: power supply, signal output, signal transmission, signal detection, inspection by sub-sector, from simple to complex, from the table to the Narrow the scope to find out where the problem is.
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