Spectrex 20/20MU - Mini Flame Detector - Manual (Page 11)

Spectrex Inc. - SharpEye TM ML & MU Flame Detector Manual – TM 767100, Rev. A, April 2005
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2.2 Sensing Elements
20/20ML
The IR sensor is sensitive to radiation over the range of 2.5-3.0 micron.
The IR channel will register a detection signal, at the appropriate level, when the
IR sensor is exposed to radiation in the appropriate frequency range, having an
intermittent gleam pattern characteristic to flickering-fire, and when a preset
threshold and time duration are reached.
The UV sensor is sensitive to radiation over the range of 0.185-0.260 micron. The
UV channel incorporates a special logic circuit that eliminates false alarms caused
by solar radiation and other non-fire UV sources. Furthermore, the UV channel
sensitivity is stabilized over the working temperature range.
20/20MU
The UV sensor is sensitive to radiation over the range of 0.185-0.260 micron. The
UV channel incorporates a special logic circuit that eliminates false alarms caused
by solar radiation and other non-fire UV sources. Furthermore, the UV channel
sensitivity is stabilized over the working temperature range.
2.3 Modbus RS-485
For more advanced communication 20/20ML and 20/20MU has a RS 485 modbus
Compatible output that provides Data communication from a network (up to 247
detectors) to a host computer on universal controller for central monitoring.
This feature enables reconfiguration of factory settings, eases maintenance and
allows local and remote diagnostics.