Answer:
The detectors feature off-white Bayblend plastic housings with a UL 94-5V flammability rating, dual LEDs offering 360-degree status visibility, and dual rotary decimal address switches for direct manual addressing (01–99 in CLIP mode and 01–159 in FlashScan mode).
The Honeywell Notifier 851 Series is built specifically to address commercial and industrial property thermal protection through robust mechanical design and straightforward addressing hardware:
- Enclosure & Flammability: The detector enclosure is molded from commercial-grade, off-white Bayblend plastic engineered to meet a rigorous UL 94-5V plastic flammability rating.
- Thermistor Sensing Circuit: Incorporates a state-of-the-art electronic thermistor sensing circuit designed for rapid thermal response without mechanical bi-metal fatigue.
- Rotary Decimal Addressing: Unlike detectors requiring external handheld programmers or binary DIP switches, the 851 Series features two onboard rotary decade switches. Field technicians set the address directly with a screwdriver from 01 to 99 on classic CLIP loops, or 01 to 159 on FlashScan protocols.
- 360-Degree LED Indication: Dual surface-mounted LEDs flash during normal SLC polling and latch solidly red during an active thermal event, providing full 360-degree visual status from any viewing angle.
- Built-in Functional Magnet Test: Contains a built-in reed test switch activated externally with a test magnet for quick field commissioning and verification.
