TEMPERATURE MEASURING METHOD AND INSTRUMENT FOR CONDUCTIVE FLUID IN PIPING

PROBLEM TO BE SOLVED: To dispense with a current electrode for supplying a heavy current, to preclude a stress concentration portion from being generated in piping therefor, and to enhance safety and reliability, in particular, under a high-temperature environment. SOLUTION: In this temperature measuring method for a conductive fluid in the piping, an alternating current is supplied from an alternating constant current power source 16 to the first induction coil 20 wherein an induction electric wire is wound a half-circumference by a half-circumference on the same circumference along an outer circumference of the piping 10 to make the same current flow in ways reversed each other, an induction current is made thereby to flow in the piping and the conductive fluid by electromagnetic induction, the alternating current same to that in the first induction coil is supplied to the second first induction coil 22 wound with the induction electric wire along the outer circumference of the piping separated from the first induction coil to make an induction current flow in the piping by electromagnetic induction, a difference between electromotive forces induced in a measuring coil 14 by the both induction currents is measured by a voltage measuring means 18, and a measured voltage is converted into a temperature. COPYRIGHT: (C)2005,JPO&NCIPI