When troubleshooting 4-20 mA signal problems, a good meter that reads 4-20 mA DC and a loop calibrator or adjustable transmitter (shown below) are our best friends. The loop calibrator/adjustable transmitter simulates a 4-20mA signal from field devices while testing control equipment. We use it to calibrate equipment having a 4-20mA analog input.
We talk a lot about 4-20 mA signals every day so I thought I'd share a little about them. When you hear 4-20 mA, current loops, or analog signals, we're talking about the same thing. 4-20 mA loops are used to transmit analog data representing various process variables such as level, pressure, flow, temperature, etc. An analog signal looks like this: While a digital signal is just on or off, an analog signal can give us more data about what's going on. 4 mA represents the lowest end of the range, while 20 mA represents the highest end of the range. When troubleshooting 4-20 mA signal problems, a good meter that reads 4-20 mA DC and a loop calibrator or adjustable transmitter (shown below) are our best friends. The loop calibrator/adjustable transmitter simulates a 4-20mA signal from field devices while testing control equipment. We use it to calibrate equipment having a 4-20mA analog input. While it's a simple enough concept, 4-20 mA problems can be very tricky to troubleshoot. In fact, MPE tells us that 60% of the technical support calls they get involve the 4-20 mA signal. You can always call us for both phone support (free of charge, always!) and to set up a service call to take a look at it.
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