Multisensor smoke detector RM 3-OT

This VdS-approved optical-thermal smoke detector minimises the susceptibility to false alarms because it also measures the room temperature in addition to photoelectric detection. The detector triggers an alarm if a light scattering by smoke or a certain temperature value or temperature rise is exceeded.

The additional thermal measurement not only minimises false alarms, but also increases the reliability of alarm detection. For example, fires with weak smoke development are reliably detected and reported on the basis of the temperature change.

The detector can be easily and quickly mounted on a base thanks to its quarter-turn fastener. Cleaning of the insect screen is facilitated by the removable cover.

    Technical Data

    • Optical detection method according to EN 54-7:2000 with drift compensation as in RM 3-O
    • Thermal detection method according to EN 54-5:2000. Response class A1R: Trigger temperature approx. 58 °C or temperature rise of 8 °C/min
    • Max. detection height 7,5m
    • Operating voltage 8 – 30 V=
    • Quiescent current input approx. 65 µA/24 V=
    • Current input during alarm approx. 50 mA/24 V=
    • To be used for -30 to +70 °C. However, temperature range of  0 to +50 °C should not be exceeded for a longer time
    • Relative humidity: 5 – 95 % (non-condensing)
    • Air speed up to 20 m/s
    • Dimensions including base MS 3-S: Ø102 x 55 mm


    • VdS approval code G 202019




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