| 摘要 |
PROBLEM TO BE SOLVED: To provide a dirt monitoring sensor in which dirt can be adhered on the outer surface of an evaluation tube in the same way as in a heat-transfer pipe, even when the temperature of the evaluation tube is set to be equal to that of the heat-transfer pipe. ! SOLUTION: A dirt monitoring sensor is configured such that a heater 11 inside an evaluation tube 10 is pressurized toward a temperature sensor 12 side by using a pressure member 13 inserted on a hollow part 10c side of the evaluation tube 10, so as to allow the heater 11 to contact closely with the inner surface of the evaluation tube 10. The temperature of the evaluation tube 10 becomes the highest on the temperature sensor 12 side among the circumferential outer surface of the evaluation tube 10. Accordingly, when the temperature of the evaluation tube 10 is set to be equal to that of a heat-transfer pipe, the temperature at the highest temperature part of the evaluation tube 10 can be set to be equal to that of the heat-transfer |
