Pyro Electric Instruments Goa Pvt. Ltd. Manufactures Differential Pressure Transmitter. Pyro Electric Instruments Goa Pvt. Ltd. Is an ISO 9001:2000 and 9002 awarded company that also manufactures of Temperature & Pressure Gauges, Catering largely to process control applications in various industries. Differential Pressure Transmitter uses a microprocessor to provide a 4-20mA output proportional to the differential input pressure. It is available with from 0 to 15 mBar up to 0 to 4000 mBar ranges. The transmitter is loop powered [2 wire system] from a 24Vdc supply. The input pressure to the transmitter is applied to a metal diaphragm that transmits the pressure to the silicon pressure transducer using a silicone oil fill.