Simplex 4098-9602 TrueAlarm Photoelectric Detector

The Simplex 4098‑9602 TrueAlarm Photoelectric Detector integrates a high-performance photoelectric smoke sensor with a fast-response thermistor-based heat module, providing comprehensive multi-mode fire detection. Utilizing patented TrueAlarm sensitivity drift compensation, it continuously adjusts to environmental changes—dust, dirt, and aging—to maintain reliable smoke monitoring. The onboard heat sensor includes both fixed-temperature (135 °F/57 °C) and rate-of-rise (>20 °F/min when ambient ≥90 °F) detection. The TrueSense algorithm correlates smoke and thermal activity for intelligent, earlier fire response while minimizing false alarms. Mounting to a standard 4098 series base, the unit supports both 2-wire and 4-wire configurations, offers magnetic testing via LED indication, and is UL‑listed (UL 268), FM‑approved, CSFM‑listed, and NYC‑accepted. Its sleek, low-profile housing (4⅞″ diameter × 2″ height) features louvered intakes, ensuring efficient smoke entry and discreet aesthetics. Operating between 32 °F to 100 °F (0–38 °C), with 0–95% humidity, it’s engineered for diverse indoor commercial applications.