Common temperature sensing alarm types

Temperature sensing alarm for fire occurs more violent, much less heat smoke place. According to the principle of action, it can be divided into the following three categories.

Differential temperature temperature alarm

Increased fire will cause temperature, when in a certain period of time, the appreciation of environmental temperature exceeds the set value, differential temperature type temperature sensing fire alarm will sound the alarm. It has two kinds of structure of linear and point. Linear temperature type temperature sensing alarm is according to the thermal effect of extensive and action, point type differential temperature temperature alarm is according to the thermal effect of local action, mainly by the temperature sensing device is a thermistor resistance elements.

Constant temperature temperature alarm

Constant temperature temperature alarm, as the name implies, refers to a fire occurs, the ambient temperature exceeds the alarm value setting, constant temperature and temperature sensing alarm will sound the alarm. It also has two kinds of structure of linear and point. The linear when the local environmental temperature rise to the specified value, the fusible insulating material melting so that the two wire circuit, resulting in fire alarm signal. The linear constant temperature and temperature sensing alarm is divided into unrecoverable type fixed temperature fire detector and recoverable type fixed temperature fire detector, the main difference between them is whether the temperature sensing cable internal can be reused. Point type fixed temperature detector of the bimetallic strip, the fusible metal, thermocouple thermistor resistance and other components, in a specified temperature value is generated on the fire alarm signal.

Differential constant temperature temperature alarm

Differential constant temperature and temperature sensing alarm integrated differential temperature and constant temperature fire alarm features, it can set a certain alarm value, also can set alarm temperature interval.