Relay Pressure Switch Manufacturer 4-20mA is widely used in Harsh environment of petroleum and chemical industry etc.Diffusion silicon sensor,Wide range,High protection grade, high precision and good stability,Digital pressure display LCD for double Output signal 4~20mA/RS485,Having the functions of conversion Various metering units counting,self-contained power, after the instrument power-off, can Sustainable work 48 hours,Shock resistance, vibration resistance, applicable in industrial field and explosion-proof.