A kind of transmitter which can be used to measure water temperature and water level is designed. Capacitive water level sensor completes the transformation from water level to capacitance. Current-type temperature sensor realizes the transformation from water temperature to current. Combining the output of capacitance-pulse width and current-pulse width transformation circuit with width-pulse proportional to water level and water temperature

both pulses synthesize a one-way measuring signal and two-ways transmission.The main points of transmitter design are listed

and the technological steps of improving credibility are provided.Experiments have proved that this kind of transmitter has high antinterference

high stability and reliability. The precision meets user’s requirements.