DEMCO Heat Detector D-133-2’s new sensor design incorporates an internal pulsing LED as well as an advanced solid-state, low-voltage, surface-mount circuitry specially designed for 2-Wire installation using the D32003 and D34003 universal bases. The detector head can be easily installed onto the base with a simple twist-lock action

Rate-of-Rise
Being the first stage of detection, the Detector senses the rate-of-rise of temperature around its zone of coverage. When the rate of temperature increase exceeds 6°C within 4 seconds, the Detector instantly switches from its normally open circuit to close circuit to activate the fire alarm.
Fixed Temperature
The Fixed Temperature method comes into action in cases of slow smoldering fire where the temperature does not increase at the rate that would trigger the Rate-of-Rise detection.

Model	Voltage DC (Max./Min.)	Standby Current (Max.)	Alarm Current 12/24V)	Surge Current (Max.)	Temperature Rating	Permissible Current (Max.)	Frequency	Base Model No.	Safety
D-133-2	10.8~33V	40pA	20/50mA	100pA	135°F/57°F	80mA	1-3 Sec.	D32003	UL/CE
D-133-2L	10.8~33V	40pA	20/50mA	100pA	135°F/57°F	80mA	1-3 Sec.	D34003	UL/CE

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