Help! The output in milliamps of the 3051 pressure transmitter is abnormal!
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The Rosemount 3051 pressure transmitter is used to measure the pressure in oil pipelines. The on-site gauge shows normal readings, and testing with a 475 handheld controller also yields normal results; the output current indicated is 4.65 mA. However, when measured with a multimeter, the actual output current is 5.6 mA. As a result, the pressure displayed on the control room system is significantly higher than it should be. What’s causing this? (The same is true for wires and channels with normal voltage transformation.)
For issues with the transmitter module, replacing it with another one will do.
Sensory judgment: There is interference! Reason: Visually, the cable you are using is unshielded and is for electrical use. Method of determination: Power the meter using an independent power supply, and then measure the circuit current with a multimeter (for example, the FLUKE 789 can supply power directly and display the circuit current). If the current is normal when this is done, it indicates that there is external interference. Otherwise, it is a problem with the transmitter’s own transmission.
It has shielding; I tried using a separate 24V power supply, but the current level was still incorrect
Bro, the module is broken; just replace it and it’ll be fine
There is a problem with the output module; it needs to be removed for calibration to confirm further
I’ve encountered this before. What you see on the HART 475 handheld transmitter is the signal before D/A conversion, while a multimeter shows the signal after D/A conversion. In simple terms, there’s a problem with the D/A digital-to-analog conversion section inside the transmitter; replace the transmitter module
Bad ball. . . Congratulations! . Congratulations, another one is now available. . . :P
There’s a problem with the digital-to-analog conversion; you have 475, and most of these faults can be fixed. Find the calibration menu and perform the calibration; that should do it. A high-precision ammeter needs to be prepared
New to the instrumentation field, coming in to take a look and learn*
I tried it as you suggested; since there was no high-precision ammeter, I used a multimeter instead. The difference is currently a little over 0.1mA, which is acceptable. Thank you!