check the cable resistance (for 2-wire transmitters typically twin lead wiring) including the barrier resistance, then check the voltage at the transmitter end while operating. Nothing is cheap in designing safe automation.
Your image shows three electrical pins on your device.
Solenoids typically have two connections for on-off.
Switches can have 3 to allow for N.O. or N.C. operation.
Lest we forget the air traffic controllers who went on strike in 1981 because of safety issues, lack of adequate staffing, time off for meals and breaks. They were all fired....
Lest we forget, female air traffic controllers during WWII, took their jobs more seriously than the males, when the 3rd Reich had boats and planes getting ready to invade of the coast of Florida.
In our case the engines were running, with flight controls operational, at issue was heading towards a large barrier, and barely coming to a halt, just in time.
Agreed the Korean flight had serious malfunctions after the bird strike, but in both cases collision with a large barrier at the end...