Edwards Signaling E-PHD Optical/Fixed Temperature Detector is an intelligent analog device houses an optical sensing chamber that detects smoke, as well as a fixed-temperature sensor that detects heat. Kidde detector analyzes data from both sensors to determine when an alarm is initiated. The detector continuously adjusts its sensitivity based on fluctuating environmental conditions such as the presence of dirt, smoke, humidity, or changes in temperature, and notifies the panel of any changes in sensor sensitivity. When the detector has adjusted its sensitivity to its maximum limit, it issues a dirty sensor warning, allowing enough of a margin for maintenance personnel to clean the detector before it goes into trouble condition. The E-PHD is capable of performing comprehensive self-diagnostics and storing the results. The E-PHD combines the suitability of optical sensing for slow burning fires with the sensitivity of fixed-temperature detection for fast flaming fires to arrive at a solution that responds reliably to the widest range of fire types. A sophisticated algorithm processes data from both sensors over time so that an alarm is only reported when conditions precisely match the signature of a fire. This eliminates the shortcomings of single-sensor optical and heat detection, and significantly reduces the risk of nuisance alarms.

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