Youll only find pressure sensors on very high end equipment, sometimes top of the line residential, or large commercial chillers, youll never see it in normal everyday stuff. If I can get my butt dressed enough to go to the van today, Ill meter out one of the sensors to see what it is. If you order the board, it comes with all 3. While on the topic of tube sensors, the Amana PTAC use tube sensors with built in stainless clips to hold them to the tube, vs the 1/4" pipe stub brazed to the line to be metered. 0130P00086 for the red shorter sensor or 0130P00093 for the blue sensor that has a longer wire. These only cost us a couple $, not sure what retail is. The PTAC also use a air temp sensor that clips into the front of the coil to catch incoming air temp which could be useful for metering ambient, 0130P00073 and 0130P00074 (for different coil tube sizes).
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