Conventional and older technology UV/IR detectors, using

narrow band 4.3 micron IR sensors, will not respond to smoky

fires or if the detector lens is contaminated with oil and

other substances since both UV and 4.3 micron signals are

attenuated, obscured or absorbed by thick smoke or detector

lens contaminations. All UV sensors will be attenuated to some

degree. Also, these old technology UV/IR detectors will not alarm

to any fire if they are installed behind ordinary window glass.

Dual microprocessors provide a high level of fail-safe operation combined with fast and reliable

performance.The master microprocessor performs high-speed digital sampling and signal

processing calculations whilst the slave microprocessor handles various sensor data, performs

communications, self-diagnostics and provides interface versatility and additional memory for

storing event log and FirePic™ data. The FS20X detector has a detection range in excess of 60 m

(200 feet) (very high sensitivity setting) for the detection of a 0.1m2 (one square-foot) Heptane

reference fire and has a cone of vision greater in volumetric coverage than most UV/IR detectors.