M B C NC NO M B C NC NO RESTRICTOR CONTROLLER Controllers sense the controlled medium directly with their sensing mechanism. This could be a thermal sensor, humidity sensor, air-flow sensor, etc. Most controllers have sensitivity adjustment. Controllers can be either direct or reverse acting. Controllers may have proportional or two position control. MAIN AIR SENSOR VALVE RECEIVER CONTROLLER Receiver controllers do not directly sense the controlled medium. Transmitters directly sense the controlled medium and report the condition of that medium. The receiver controller controls the condition of the medium. Receiver controllers have sensitivity adjustment. Some have secondary port reset. Some have control port adjustment. Some have integral reset. Receiver controllers can be direct or reverse acting. Receiver controllers may be two position or proportional control. MAIN RECEIVER CONTROLLER AIR TRANSMITTER VALVE 4.31
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