Recoverable type linear temperature-sensing detecting instrument

Abstract

The invention discloses a recoverable type linear temperature-sensing detecting instrument, comprising a first detecting device, a second detecting device, a third detecting device, a signal processing device and an alarming device, wherein each detecting device comprises a temperature-sensing cable, and a detector and a terminal resistor respectively connected to two ends of the temperature-sensing cable; each detector detects electrical signals of the corresponding temperature-sensing cable; the signal processing device receives the electrical signals from the first, second and third detectors respectively, compares values of the received electrical signals with a preset threshold range, and controls the alarming device to give out an alarm according to a comparison result. According to the recoverable type linear temperature-sensing detecting instrument provided by the invention, the electrical signals of three sets of detecting devices are comprehensively judged, so that the mistaken alarm caused by using the single cable is avoided, alarming reliability and sensitivity are improved, and repeated use can be achieved.

Description

technical field [0001] The invention relates to the field of temperature detection, in particular to a recoverable linear temperature sensing instrument. Background technique [0002] The cable-type linear temperature detector consists of a sensitive element and a conversion box connected to it. Cable-type linear temperature detectors usually use metal conductors to coat insulating materials outside, and detect temperature changes with high sensitivity by detecting the resistance of the insulating materials between the metal conductors as the temperature changes. However, in practical applications, the temperature sensing cable has the following problems in detecting the ambient temperature. First, the cable is locally heated, which greatly reduces the detection sensitivity. Second, the cable itself fails, causing false alarms or no alarms, resulting in alarm reliability. The third is that the internal temperature of the cable rises when it is working, which also affects th...

AI Technical Summary

Problems solved by technology

However, in practical applications, the temperature sensing cable has the following problems in detecting the ambient temperature. First, the cable is locally heated, which greatly reduces the detection sensitivity. Second, the cable itself fails, causing false alarms or no alarms, resulting in alarm reliability. The third is that the internal temperature of the cable rises when it is working, which also affects the sensitivity and reliability of the detection

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