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Originally Posted by pras870
If I'm reading the flow chart correctly and what a pressure transducer is used for, I would say it is not legal to be used.
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A pressure transducer is not an energy source. It's an analog pressure sensor that allows you to see exactly what the air pressure in your pneumatic system is - unlike the pressure switch, which just turns on or off based on a fixed setpoint, the transducer outputs a voltage that is ratiometric to the pressure of the system connected to it. They are indeed legal - in fact, you should have received one in the kit of parts. It's a little brass thing with one threaded end and one end that has three wires hanging out of it.