Fire Alarm Conventional

  • Conventional Smoke Detector

    Model D-213

    DEMCO Photoelectric Smoke Detector D-213 with its new sensor design incorporates an internal pulsing LED and a photo-diode at an obtuse angle, is ideal for applications where slow-burning or smouldering fires are likely.

    The D-213 has an advanced solid-state, low-voltage, surface-mount circuitry and are designed for 2-Wire installation using the D3X001 universal base. The detector head is installed into the base with a simple twist-lock action.

    The 360-degree detector design permits smoke entry from any direction, and a unique sensing chamber that permits operation in open areas with air velocities from 0 to 300 fpm.

    A fine wire mesh extending between offset ports in the exterior and interior walls screens insects from the chamber and obstructs light from passing directly to the interior part.

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  • Ionization Smoke Detector

    Ionization Smoke Detector
    The sensing part of the detector consists of two chambers – an open outer chamber and a semi-sealed reference chamber within. Mounted in the reference chamber is a low activity radioactive foil of Americium 241 which enables current to flow between the inner and outer chambers when the detector is powered up.

    As smoke enters the detector, it causes a reduction of the current flow in the outer chamber and hence an increase in voltage measured at the junction between the two chambers. The voltage increase is monitored by the electronic circuitry which triggers the detector into the alarm state at a preset threshold. An externally visible red LED lights up when in alarm. IP rating = IP23D

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