What is the typical resistance of the excitation coil in ABB electromagnetic flowmeters in ohms?
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As the title suggests, I went for a check today; the resistance between the M1 and M2 coils is 6MΩ, and the current flowing is consistently 21.8mA. Is it possible that the excitation coil is damaged?
The DC resistance of the excitation coil is generally within 100 ohms
I don’t know which location’s resistance you measured? Generally, an electromagnetic flowmeter has 5 wires: two signal wires, two wires for the excitation coils, and one ground wire
If you are sure the wire measurements are correct, then there must be an issue with this resistance value; the coils of our electromagnetic flowmeters have a resistance of several dozen to over a hundred ohms. Different brands can’t be that much different.
I can understand it as two power cables, two signal cables (for signals to the DCS), and one ground cable
I would like to ask where you measure the resistance value – is it by directly measuring the resistance between the signal wires?
I can’t remember; it seems to be around 100 ohms. Megohms is definitely not correct – either the device was damaged or the measurement was wrong
May I ask if it is to measure the resistance value between the signal lines?
Is it a split-type? I'm referring to the split-type models that can be measured; I haven’t disassembled the integrated ones yet. The measurement method is as follows: disconnect the 5 wires from the sensor to the converter, and measure the wires at the sensor end
Is it a split-type? I'm referring to the split-type models that can be measured; I haven’t disassembled the integrated ones yet. The measurement method is as follows: disconnect the 5 wires from the sensor to the converter, and measure the wires at the sensor end
I am measuring the two sets of wires of the excitation coil