Multi-temperature impedance characteristic sensing cable and temperature-sensitive detector using the same

Abstract

The invention discloses a multi-temperature impedance characteristic sensing cable, and a temperature detector using the sensing cable; the sensing cable is composed of 2 to 6 metal conductors, recoverable insulating layers with different temperature impedance characteristics, as well as 1 to 2 layers of outer jackets; each metal conductor sequentially comprises 1 to 2 insulation layers which are twisted into ropes; the twisted ropes are arranged in the 1 to 2 layers of outer jackets; the temperature detector is composed of a temperature sensing interface unit, sensing cables corresponding to the temperature impedance characteristics, and the cable terminal units; and the temperature sensing interface unit is mainly composed of a signal amplification and linearization circuit, an analog / digital conversion circuit, a microprocessor circuit (MCU), a display and operation circuit, a pulse output circuit and a timer circuit. The temperature detector can achieve the differential temperature, stationary temperature or differential stationary temperature alarm of the low, medium, high temperature ranges.

Description

technical field [0001] The invention relates to a sensing cable and a positionable temperature-sensitive detector composed of the sensing cable. Background technique [0002] Since the 1970s, linear temperature-sensitive detectors have been developed and widely used abroad. They have advantages that ordinary typical temperature-sensitive detectors do not have: continuous monitoring of areas along the line, strong ability to withstand harsh environments, etc. . The development of linear temperature detectors has also gone through multiple stages, from switching linear temperature detectors to analog linear temperature detectors, to continuous thermocouple temperature detectors, and the development in the past ten years Of course, the detectors at each stage of development have their own advantages and disadvantages. [0003] The recently developed continuous temperature measurement and positioning detector and distributed optical fiber temperature measurement and detection ...

AI Technical Summary

Problems solved by technology

However, the disadvantages of the distributed optical fiber detection system are: the life of the host and the risk caused by a single loop spanning too many fire compartments. In addition, for heating with a small length, such as heating below 1m, the temperature reported by the system is very inaccurate and cannot be accurate. Call the police

The main disadvantage of the continuous temperature measurement and positioning detector is that it is not sensitive to the heat of a single point with a small length.

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