Two-wire transmitter with threshold detection circuit

Abstract From the Canadian patent

A threshold detection circuit for improving the output of a two-wire transmitter is disclosed. The transmitter comprises a sensing means which has a sensor responsive to a parameter to be sensed by the transmitter and an excitation means which provides an excitation output to excite the sensor . A threshold detection circuit is coupled to the sensor output and provides a detector output representative of an undesired change in excitation output which can produce a sensor output which is not substantially representative of the sensed parameter An output means is coupled to the sensor output and detector output and provides the transmitter output as a function of the sensor output and …