Three wire system pressure transmitter

The utility model provides a three wire system pressure transmitter, belongs to ressure measurement technical field. Including pressure sensor, its characterized in that: the input that the module is enlargied to the instrument is connected to pressure sensor's output, and the output connection AD conversion module's of module input is enlargied to the instrument, and the input of CPU module is connected to AD conversion module's output, and DA conversion module's input is connected to the output of CPU module, and VI conversion module's input is connected to DA conversion module's output, and VI conversion module's output send the output for the change, still be provided with and carry out the power supply unit of supplying power for pressure sensor, instrument amplifier module, AD conversion module, DA conversion module, VI conversion module and CPU module. The utility model discloses a three wire system pressure transmitter has simple structure, the dependable performance, and advantage that the precision is high, the PLC who is particularly useful for having the three wire system requirement uses.