Spectrex 40/40I Triple IR (IR3) Flame Detector - Manual (Page 20)

SharpEye TM IR3 Flame Detector User Guide
8 Performance Considerations
1.5.1.2 Sensitivity Ranges
The detector has four user-selectable sensitivity ranges. For each range
there are two response levels.
 WARNING (Pre-alarm)
 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
Table 2.
Table 2: Sensitivity Range Levels
Level Response Time (sec) Sensitivity Range- ft. (m)
1 3 50 (15)
2 Default 5 100 (30)
3 8 150 (45)
4 10 215 (65)
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 temperature,
air pressure, humidity, visibility conditions, and so on.