TEMPERATURE SENSOR

摘要

In a temperature sensor, two seal members seal the open opposite ends of a cladding member (a forward end and a rear end), so that water absorption by an insulator of a sheath member can be restrained. The seal members are formed to have an insulation resistance equal to that of a conductor-fixing material. Therefore, even when the temperature sensor is used in a high-temperature environment, the insulation performance of the seal members does not become lower than the insulation performance of the conductor-fixing material, so that the formation of a leakage current path can be suppressed. According to the temperature sensor, the electrical property of a temperature sensitive element can be sensed accurately, and a reduction in the accuracy of temperature sensing can be restrained.

主权项

1. A temperature sensor comprising:
a temperature sensitive element having an electrical property that changes with temperature; a sheath member including at least one conductor extending in a lengthwise direction of the temperature sensor and is electrically connected to the temperature sensitive element directly or through another member, an insulator formed of an insulating material and surrounding the at least one conductor, a metallic cladding member covering the insulator and open at opposite ends in the lengthwise direction, and seal members sealing the open opposite ends of the metallic cladding member with the at least one conductor extending outward from the metallic cladding member through the seal members; and a covering member formed mainly of glass and covering a junction between the at least one conductor and the temperature sensitive element or a junction between the another member and the temperature sensitive element, wherein: an electric resistance of the temperature sensitive element increases with the temperature, and an insulation resistance of the seal members is equal to or greater than an insulation resistance of the covering member.