JTW-LCD-SF901A Cable Type Linear Temperature Sensor Fire Detector (hereinafter referred to as the detector) is a new, reusable fire detection patent product that integrates differential temperature and fixed temperature sensing to monitor changes in ambient temperature.(Chinese Invention Patent No. 200910161244.7)Composed mainly of a signal processing unit (microcomputer processor), temperature-sensing cable (electric cable), and connection components (terminal boxes), the detector features the function of separately outputting differential temperature and constant temperature alarm signals.
Product Features
The temperature-sensitive cable of the detector is an element sensitive to temperature. The JTW-LCD-SF901A temperature-sensitive cable can detect temperature changes at any point along its installed length. In addition to having a fixed temperature alarm, it also features differential temperature alarm, which means it can quickly emit a fire alarm signal when the rate of environmental temperature change is too high. This greatly enhances the detector's response speed to temperature, overcoming the drawback of slow alarm response in traditional single fixed-temperature detectors, and is beneficial for the timely discovery of fires to prevent greater losses. The working principle is that when the temperature (heating rate) rises to the response value, there is a sudden change in resistance between the cores of the temperature-sensitive cable, and corresponding signals are generated between the wires. The microcontroller then uses fuzzy mathematics calculation methods to make a fire alarm judgment.
Thermally sensitive cable features stable structure, excellent anti-interference performance, and soft material for easy installation.
2. Integrated judgment of analog signal acquisition.
Complies with the requirements of Section 4.18 of GB16280-2014 for small size high-temperature response performance testing.
4. The temperature sensor cable remains undamaged after an alarm within the safe temperature range, allowing for reusable cable.
5. Adjustable set temperature: 85°C, temperature change: 10°C/min, 20°C/min, 30°C/min.
6. Features open circuit, short circuit, and power failure alarm functions.
7. Microcomputer processors and terminal box shells are made of flame-retardant materials, offering corrosion and aging resistance.
8. With manual fire alarm simulation feature.
9. The sensor boasts strong anti-interference capabilities, utilizing isolation detection and software anti-interference technologies, suitable for use in environments with strong electromagnetic field interference.
Applicable Scenarios
The detector features the function of separately outputting differential temperature and constant temperature alarm signals. It has excellent environmental adaptability, capable of operating reliably at close or near-protection distances in various fire detection locations prone to dampness, pollution, and dust. Therefore, it is widely used in warehouses, yards, oil and gas transmission pipelines, transformers, belt conveyors, locomotives, and distribution panels. Particularly suitable for early fire alarm prediction in power cables and control cables within cable tunnels, cable bridges, and cable wells.
