Recoverable cable type linear temperature difference-sensing detector

Abstract

A restorable cable-type temperature difference and sensing detector consists of a microcomputer modulator and a temperature sensing cable, and a terminal processor. The detector is characterized in that the temperature sensing cable in the detector is composed of a line-type temperature sensing component C and a line-type temperature sensing component D, which can generate two same equivalent electric parameter signals. The electric parameter signals can be voltage, resistance, capacitance, etc. When the temperature rising speed reaches or exceeds 10 Celsius system / min, the electric parameter values of the line-type temperature sensing component C and D have unequal changes, since the temperature sensing component C or D with external protection layer or heat insulation layer has the different heat transmission coefficient with the sensing component C or D without external protection layer or heat insulation layer. If the absolute difference between the two electric parameters collected by the microcomputer modulator is above or equal to the preset value, the detector will send alarm signals to realize alarm of temperature difference.

Description

technical field [0001] The invention relates to a fire alarm device, which is a recoverable cable type differential temperature sensor. technical background [0002] The analog linear temperature detector in the prior art is a widely used fire detector, with figure 1 It is a Chinese patent application number: 200510104904.X, which discloses a double-criteria analog quantity line type temperature-sensitive fire detection cable, which is composed of two detection conductors, an NTC characteristic barrier layer, and a heat-sensitive characteristic barrier layer. An NTC characteristic barrier layer is set between the parallel detection conductors to form a detection cable A'; a heat-sensitive characteristic barrier layer is set between the other pair of parallel detection conductors to form a detection cable B'; the detection line The cable A' and the detection cable B' are combined together; the temperature coefficient of the NTC characteristic barrier layer is α T A, the tem...

AI Technical Summary

Problems solved by technology

This kind of detector is affected by the ambient temperature, and the setting value of different ambient temperature needs to be changed. At the same time, the length of heating will also affect the judgment of its signal acquisition. The signal device of each detector needs to collect two or more signals. More than one different parameter value is judged by a complex function algorithm, which can easily lead to false positives and false negatives

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