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Combined analogue addressable electrooptic smoke maximum differential Optical/heat detector OHD64 is designed to detect fires accompanied with low concentration smoke occurrence and increased temperature inside the space under monitoring as well as to transmit a “Fire” signal to receiving and control device R3500.

Power supply from DCL (28 – 36 V)
Detector sensitivity 0,05 to 0,20 dB/m
The detector remains functional when affected by air flow rate
background luminance of artificial or natural light sources
up to10 m/s
up to 12000 lx
Temperature of the detector trip by thermal channel: from 54 to 70 °С
LED flashing frequency in stand-by / “Fire” mode 0,2 Hz/2 Hz
Overall dimensions of the detector with power outlet, no more than Ø94×58 mm
Detector weight, power outlet including, no more than 120 g
Operating temperature range from -25 to +55°С
Average service life, at least 10 years

Ways of fire detection: smoke concentration, max temperature, and temperature increase rate.

The detector performs the following functions:

  • smoke concentration measurement; ambient temperature measuring;
  • temperature change rate calculation;
  • measuring results processing using special algorithms and “Fire” signal transmission to receiving and control device;
  • indication of detector operation mode;
  • automatic dust-compensation;
  • functioning test with a button or an optical tester OT-1.

Power supply and data exchange of the detector is performed via a two-wire DCL.

The detachable connection between the sensor and the socket provides easy installation, mounting, and maintenance of the detector. Circular contacts allow mounting of the detector without orientation with respect to the socket.
To facilitate DCL shielded cables installation, cable-mounting plate is provided on the power outlet (option). It can be mounted on dropped ceiling using a special socket combined with mounting rings.