The Orbis Marine Optical /Heat Multisensor Detector is recognised as a good detector for general use but is additionally more sensitive to fast burning, flaming fires - including liquid fires - than optical detectors. They can be readily used instead of optical detectors but should be used as the detector of choice for areas where the fire risk is likely to include heat at an early stage in the development of the fire. The Multisensor detector has two sensors, one for smoke and one for heat with the alarm decision derived from either sensor or combination of both.
| Detection principle | Smoke: Photo-electric detection of light scattered by smoke particles Heat: Temperature-dependent resistances. |
| Sampling frequency | Once every four seconds |
| Operating voltage | 8.5 V dc to 33 V dc |
| Supply Wiring | Two wire supply, polarity sensitive |
| Maximum polarity reversal | 200 ms |
| Power up time | < 20 seconds |
| Minimum ‘detector active’ voltage | 6 V |
| Power-up surge current at 24 V | 95 µA |
| Average quiescent current 24 V | 95 µA |
| Alarm current 12 V 24 V |
20 mA 40 mA |
| Alarm load | 600 Ω |
| Holding voltage | 5 V - 33 V |
| Minimum holding current | 8 mA |
| Minimum voltage to light alarm LED | 5 V |
| Alarm reset voltage | < 1 V |
| Alarm reset time | One second |
| Alarm indicator | Integral indicator with 360º visibility |
| Remote output LED (-) characteristic | 1.2 kΩ connected to negative supply |
| Operating and storage temperature | -40ºC to +70ºC |
| Humidity (no condensation or icing) | 0% to 98% RH |
| Effect of atmospheric pressure on optical sensor | None |
| Effect of wind speed | None |
| IP Rating | designed to IP23D |
| Standards & approvals | EN54-5, EN54-7, MED, LR, BV, ABS and CCS |
| Dimensions | 97 mm diameter x 31 mm height 100 mm diameter x 46 mm height in base |
| Weight | 75 g detector 135 g detector with base |
| Materials | Housing: White flame-retardant polycarbonate |
| Terminals | Nickel plated stainless steel |
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