1. Constant temperature detector
Constant temperature detector is a fire detector that starts to alarm when the temperature rise caused by fire exceeds a fixed value within a specified time. It has two structures: linear and point. When the local ambient temperature rises to the specified value, the fusible insulator melts to short circuit the two wires, resulting in a fire alarm signal. The point type constant temperature detector uses bimetallic sheet, fusible metal, thermocouple, thermistor and other elements to generate fire alarm signal at the specified temperature value.
2. Differential temperature detector
Differential temperature detector is a fire detector that starts alarm when the temperature rise rate caused by fire exceeds a specified value within a specified time. It also has linear and point structures. Linear differential temperature detector acts according to a wide range of thermal effects, point differential temperature detector acts according to local thermal effects, and the main temperature sensing devices are thermal semiconductor resistance elements.
3. Differential constant temperature detector
The differential constant temperature detector combines the two action principles of constant temperature and differential temperature, and combines the two detector structures together. Differential and constant temperature detectors are generally thermal semiconductor resistance equal point combined detectors.
Linear thermal fire detector
Linear temperature sensing fire detector is a fire detector that responds to the temperature parameters around a continuous line in the protected area. According to the action performance, it can be divided into: linear constant temperature detector, linear differential temperature detector and linear differential constant temperature detector; According to the working principle, it can be divided into: cable type linear temperature sensing fire detector (including constant temperature, differential temperature and differential constant temperature), air pipe type linear temperature sensing fire detector (including differential temperature and differential constant temperature); According to the working mode, it can be divided into recoverable linear temperature sensing fire detector and non recoverable linear temperature sensing fire detector.