4 – 20 mA Pressure transducers are loop power devices and are connected between an analog input set to 4-20mA, and a plus 24 volt supply. The power to run the electronics is derived from the voltage across the transducer.   Connecting a pressure transducer to an Emotron FDU VFD If a pressure transducer is … Continue reading Connecting Pressure Transducers to VFDs