As more and more refrigeration systems incorporate electronic controls into their design, it is becoming increasingly important for technicians to be able to troubleshoot these electronic devices. One such device is the pressure transducer.
Pressure transducers allow a controller to interrupt a system’s refrigerant or oil pressure by converting a measured pressure into an analog electrical output to the system’s controller. The actual electrical output will vary based on the type of transducer used and the measured pressure. Common outputs are 0.5 vdc to 4.5 vdc, 0 vdc to 10 vdc, and 4 mA to 20 mA. However, technicians may come across a transducer with a different range of electrical outputs. It is always best to verify its specifications provided by the transducer manufacturer. This information will either be listed on the transducer itself or in the literature.