Double-criterion simulation quantity linear temperature-sensitive five disaster detection cable

Abstract

The detection cable is composed of two pairs of detection conductor, diaphragm layer in NTC characteristic, and diaphragm layer in temperature sensing characteristic. Diaphragming layer in NTC characteristic is setup between a pair of paralleled detection conductor so as to constitute detection cable A. diaphragm layer in temperature sensing characteristic is setup between another pair of paralleled detection conductor so as to constitute detection cable B. the detection cable A and the detection cable B are composite each other. Temperature coefficient of diaphragm layer in NTC characteristic is alpha TA. Temperature coefficient of diaphragm layer in temperature sensing characteristic is alpha TB. The alpha TA is not equal to the alpha TB. The diaphragm layer in temperature sensing characteristic is selected from diaphragm layer in NTC, PTC, or CTR characteristic. Advantages are: reducing rate of false alarm, repeated use, raised reliability and length of use.

Description

Technical field [0001] The invention relates to a dual-criteria analog quantity line type temperature-sensitive fire detection cable. The detection cable is composed of NTC material and other heat-sensitive materials, and can be combined with a resistance signal measuring device (microcomputer head) to form a constant temperature and a differential temperature Or differential constant temperature analog linear temperature-sensitive fire detector, based on dual-criteria alarm, overcomes the false alarm of traditional detectors, and improves the reliability and use length of analog linear temperature-sensitive fire detection cables. Background technique [0002] In the prior art, the commonly used NTC characteristic analog wire-type temperature-sensing detection cable is a widely used fire detection cable. Figure 1 (cross-sectional view of the cable) shows the traditional analog wire-type A schematic diagram of the structure of a temperature-sensitive detection cable. In the detect...

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Problems solved by technology

For the other two factors, the temperature-sensing detection cable in the prior art cannot be eliminated, which will have an impact on the reliability and sensitivity of the detection cable

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