Linear temperature sensor

Abstract

This invention discloses one linear temperature sense elements, which comprise two pieces of parallel detection conductors and melt insulation layer and NTC property materials and high flexible point insulation materials combination layer. This invention uses NTC property materials high flexible insulation materials insulation distribution to form combination layer and melt insulation layer set between two pieces of conductors, wherein, due to high insulation materials melt with its temperature higher than NTC materials melt one.

Description

technical field [0001] The invention relates to a linear temperature sensing element, in particular to a linear temperature sensing element capable of preventing short-circuit false alarms in response time and consistency tests and capable of repeated use. Background technique [0002] The linear temperature detector is a fire detector with a wide range of uses. It usually consists of a linear temperature sensing element, a terminal resistor connected to one end of the linear temperature sensing element, and the other end connected to the linear temperature sensing element. It is composed of a conversion box that detects the alarm electrical parameters (or sampling values) on the temperature sensing element, and outputs fire alarm signals according to the magnitude or change value of the alarm electrical parameters (or sampling values). A linear temperature sensing element is disclosed in Chinese patent applications No. 200520121813.2 and No. 200510114820.4 filed by the inve...

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Problems solved by technology

But, there is following problem in this linear temperature sensing element of prior art: when carrying out response time and consistency test to linear temperature sensing detector, need to make the heated temperature of linear temperature sensing element rise to response time and Consistency test temperature, the test temperature is usually set to 1.4 times the action temperature of the linear temperature sensing element, that is, if the action temperature is 85°C, the response time and consistency test temperature is 119°C, but this temperature has already exceeded The softening point temperature of the two materials that can melt the insulating layer 4 and the NTC characteristic barrier layer 3, that is, the two materials have been softened or melted. At this time, the two detection conductors 1 and 2 will be affected by their own deformation stress. Eliminate the fusible insulating layer 4 and the NTC characteristic barrier layer 3 between the two detection conductors 1, 2, so as to directly contact and cause a short circuit, resulting in a fault alarm from the conversion box connected to one end of the line-type temperature sensing element. Signal

In addition, since the structure of the meltable insulating layer 4 and the NTC characteristic barrier layer 3 in the heated part of the linear temperature sensing element has been destroyed in the above-mentioned test, it cannot be reused, which will cause a large waste

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