The diaphragm-type high-temperature melt pressure transmitter is special pressure instrument which uses isolated method to measure the specific conditions. It is widely used in the chemical fiber spinning machines, plastic and rubber extrusion machines to measure and control pressure of 200～300℃ high-temperature melt medium. The pressure transmitter is good anti-temperature and uses pointer to indicator pressure value on site and output two-wire 4～20mA DC standard current signal. It can match with secondary instrument to control and display pressure value in the control room.