THREE-WIRE OR FOUR-WIRE TEMPERATURE MEASUREMENT DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a three-wire or four-wire temperature measurement device which can prevent a temperature measurement from being interrupted and can improve the reliability of the temperature measurement.;SOLUTION: The three-wire or four-wire temperature measuring device, employing a resistance thermometer sensor, is equipped with a disconnection diagnosis circuit which diagnoses the presence or the absence of disconnections in wiring to the resistance thermometer sensor; a wiring switching circuit which switches the wiring to the resistance so that one side of the resistance thermometer sensor is connected to at least the main input terminal of the temperature-measuring device; and the other side of the resistance thermometer sensor is connected to at least a sensor ground terminal of the temperature-measuring device, on the basis of diagnostic results of the resistance thermometer sensor.;COPYRIGHT: (C)2005,JPO&NCIPI