Spectrex 20/20MI - Mini Triple IR (IR3) Flame Detector - Manual (Page 17)

Spectrex Inc. - SharpEye TM Mini IR3 Flame Detector Manual – TM 787100, Rev. D April 2011
9
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 four 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.
Table 1: Alarm Response Time Versus Range – 20/20MI-1
10 20 30 40
Sensitivity Range – ft (m) 33 (10) 65 (20) 100 (30) 132 (40)
Response Time (sec) 5 8 10 10
Table 2: Alarm Response Time Versus Range – 20/20MI-3
2.5 5 7.5 10
Sensitivity Range – ft (m) 8.2 (2.5) 16.5 (5) 24.7 (7.5) 33 (10)
Response Time (sec) 1 1 2 3
For some typical ambient conditions the Zeta parameter as defined in NFPA 72 for
the detector is 0.005 (1/meter).
Note:
Zeta parameters may vary significantly with changes in temp, air pressure,
humidity, visibility conditions, etc.