What are the commonly used fire detection methods in the fire protection system?
The temperature sensing detector can be divided into two types: constant temperature type and differential temperature type.The fixed temperature detector is that when the temperature of the detector is increased to the preset temperature, the alarm is sent out under the action of the temperature sensing element. The temperature sensing element has a low melting point alloy, a platinum gold wire, a bimetallic plate, a bimetallic cylinder, a thermistor, and a semiconductor P - N junction.
In order to improve the accuracy of automatic detection, two kinds of temperature sensing elements, which are fixed, moderate and differential temperature, are used in the temperature sensitive detector simultaneously. The utility model is suitable for the fire developing rapidly, producing a large amount of heat, and the temperature rising rapidly, especially the fire place where a large amount of dust, smoke and water vapor exist
A differential temperature detector is designed to alarm when the temperature rise exceeds a certain limit. For example, if the temperature rises above 10C or 15C in 1min, the alarm will be carried out. The sensitive elements of the differential temperature detector are mostly bimetal, differential temperature, film box difference, mild thermistor, differential temperature component, etc. when the temperature of the detected place rises rapidly, the element moves through the signal and gives an alarm.
