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Linetype fire disaster detector temperature-differential alarming threshold calibration method for following temperature rising

A fire detector and alarm threshold technology, which is applied in the field of correction of the differential temperature alarm threshold of an on-line fire detector with the temperature rise time, can solve problems such as inability to solve false alarms and the like

Active Publication Date: 2008-06-04
SURELAND IND FIRE SAFETY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the differential temperature or differential constant temperature detectors in the prior art cannot solve the above-mentioned problem of false alarms when a fixed differential temperature alarm threshold is used.

Method used

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  • Linetype fire disaster detector temperature-differential alarming threshold calibration method for following temperature rising
  • Linetype fire disaster detector temperature-differential alarming threshold calibration method for following temperature rising
  • Linetype fire disaster detector temperature-differential alarming threshold calibration method for following temperature rising

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Embodiment Construction

[0011] see figure 1 The schematic diagram of the composition of the linear differential temperature or differential constant temperature fire detector, the linear differential temperature or differential constant temperature fire detector is composed of the conversion box 1, the linear temperature sensing element 2 and the terminal box 3 main components. The linear temperature sensing element 2 is a temperature-sensitive NTC cable or air tube temperature sensing element, which converts the heated temperature around it into electrical parameters or sampled values. The conversion box 1 always measures the electrical parameters or sampled values ​​of the linear temperature sensing element 2 . The terminal box 3 is connected to the circuit of the linear temperature sensing element 2 to monitor the circuit breakage of the linear temperature sensing element 2, and the terminal box 3 according to the different structures of the detectors It can be set or not set.

[0012] The diffe...

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Abstract

The invention relates to a method with a temperature-rise time for correcting a threshold value of differential temperature alarm for a line-type fire detector. The method includes the following steps: the temperature of the detector begins to rise from a moment of (t0), and a conversion box detects and calculates a variable quantity of (Delta P<T1>) of an electrical parameter (or a sample value) P in a moment of (t1) of a first alarm time period (Delta T). After Delta P<T1> does not reach an initial threshold value of difference temperature alarm of (Delta PF0) which is set in advance, the conversion box corrects the threshold value of difference temperature alarm (the threshold value of difference temperature alarm is increased following an increase of the temperature-rise time) automatically with lasting temperature-rise time according to a procedure and data inputted in advance, thus removing a false alarm by a line-type differential temperature detector or a differential fixed temperature detector in a non-active performance test of fixed temperature (or differential temperature) or an active performance test of fixed temperature so as to satisfy test requirements on active performance and non-active performance of the detector.

Description

technical field [0001] The present invention relates to a method for correcting the differential temperature alarm threshold of a linear fire detector with the temperature rise time. The method is to use the conversion box of the linear fire detector to detect the change of the alarm parameter in the first alarm time period. When the When the variation does not reach the initially set differential temperature alarm threshold, the conversion box corrects the subsequent differential temperature alarm threshold so that it increases with the increase of the temperature rise time, thereby preventing the differential temperature detector or differential temperature from The differential temperature false alarm of the constant temperature detector. Background technique [0002] In the prior art, the commonly used NTC characteristic cable type or air pipeline type differential temperature or differential constant temperature fire detector is a linear fire detector with a wide range ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B17/06G08B29/00
Inventor 张卫社李刚进
Owner SURELAND IND FIRE SAFETY
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