The fire heat (fixed temperature/rate-of-rise) detector TPT-4 is designed for the control of ambient temperature in enclosed premises of different buildings and constructions.

When the ambient temperature in a guarded room exceeds the threshold value, the detector forms the "Fire" signal for a control panel. The "Fire" mode is induced by a red optical indicator. The detector is counted on the continuous 24-hours operating along with a control panel by the 2-wire alarm loop (D.C. or A.C.) with the nominal power voltage 12 or 24 V.

The detector complies with A2R class on DSTU EN 54-5:2003.