Switch valve feedback signal
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Dear sea friends and experts, may I ask whether the feedback switch in the image sends a NAMUR signal or a digital signal?
Visual inspection of digital signals! Measure with a multimeter
This must be a valve position transmitter, right? The output is a 4-20Ma signal
It’s obvious that this switch box has been modified – the two microswitches for dry contacts were removed, and a gear mechanism was added below, resulting in a 4-20Ma signal output. The advantage of this type of output is that it allows for feedback on the valve’s position ranging from 0% to 100%. Ordinary digital signal switches can only detect whether something is on or off; if the valve is in an intermediate position, it cannot be detected
There are three wires at the output; it doesn’t seem to be 4-20mA
Let’s use a multimeter to check it; it seems to be just a variable resistor. . .
It shouldn’t be that Moore signal; it’s expensive and not widely used in China