Heat detectors offer an acceptable, but less sensitive alternative to smoke detectors if environmental conditions rule out their use.
601H-R (rate-of-rise) and 601H-F (fixed temperature) detectors detect abnormally high rates of rise of temperature and abnormally high (static) temperatures respectively.
For general use and particularly where the ambient temperature may be low, a rate-of-rise heat detector 601H-R is to be preferred. A fixed temperature limit is also incorporated in these detectors.
In many environments, e.g. kitchens, canteens and boiler rooms, sudden, large changes in temperature are considered normal therefore rate-of-rise detectors are generally not suitable in these cases and a slower response fixed temperature detector 601HF should be used.
