Spectrex 20/20MU - Mini Flame Detector - Manual (Page 16)

Spectrex Inc. - SharpEye TM ML & MU Flame Detector Manual – TM 767100, Rev. A, April 2005
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3. Performance
3.1 Detection Sensitivity
Detection sensitivity is the maximum distance at which the detector will reliably
detect a specific size of fire & typical type of fuel (standard fire).
Standard Fire:
A 1ft
2
(0.1m
2
) Gasoline pan fire with max. wind speed of 6.5 ft/sec (2 m/sec).
Sensitivity Ranges:
The detector has two user selectable sensitivity ranges. For each range there are
two response levels.
1. WARNING (Pre-alarm)
2. ALARM
The detection distance, for the WARNING level, is approximately 10% higher than
the ALARM distance. Alarm response times for a “standard fire” at a specified
range are shown hereunder.
Sensitivity Range – ft (m)
50 (15)
Response Time (sec) 5
For some typical ambient conditions the Zeta parameter as defined in NFPA 72 for
the detector 20/20ML is 0.01 (1/meter) and 20/20MU is 0.0003 (1/meter).
Note:
Zeta parameters may vary significantly with changes in temp, air pressure,
humidity, visibility conditions, etc.