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Heat detectors offer protection in areas such as kitchens, saunas and garages laundry room or attic where the environment is dirty or smoky under normal conditions or where there is a high presence of airborne particles such as water vapour or exhaust fumes.Heat detectors are commonly marked "Not a life safety device". Heat detectors are not meant to replace smoke detectors in life safety applications like in bedrooms.
Heat detectors are divided into two groups; rate-of-rise and fixed temperature
Rate-of-rise heat detectors
Rate-of-rise (ROR) heat detectors react to the sudden change or rise in ambient temperature from a normal baseline condition. Any sudden temperature increase that matches the predetermined alarm criteria will cause an alarm. This type of heat detector can react to a lower threshold condition than would be possible if the threshold were fixed. A typical alarm may sound when the rate of temperature rise exceeds 12° to 15°F (6.7° to 8.3°C) per minute.
Fixed temperature heat detectors
This type of detector reacts when the ambient temperature reaches a fixed point. The most common fixed temperature point is 58°C or 136.4°F.
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