SERVICE TECHNIQUE SYSTEMES DE NAVIGATION Engineering Development Marketing Company Complete Solution Pressure Transmitters Level Measurement in Ballast & Service Tanks, Multipurpose Pressure Measurement , Pressure transmitters series 27,86 and 93 utilize the piezo-resistive pressure sensor. It is a fully active Wheatstone Bridge of resistors diffused in a crystal silicone The direct conversion of the pressiire^-' into an electrical signal is achieved by a minute deflection of sensor which changes the resistance of the bridge with the applied stress. Changes ini7, if» pressure cause a corresponding change in the transmitter output in proportion i to the bridge unbalance. Asingle 1 9 electronic circuit supplies power to sensor and receives its signal providing conversion into a standard 4-20 mA DC.1 ?9 The circuit card contains the span and zero adjustments. Technical Data Material' MSTOI#,