Spectrex 40/40M Multi IR Flame Detector - Manual (Page 20)

Multi IR Hydrocarbon and Hydrogen Flame Detector User Guide
8 Performance Considerations
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.
1.5.1.3 Other Fuels
The detector reacts to other types of fire as follows:
 The baseline fire refers to n-heptane 1ft 2 (0.1m 2 ) and is defined as
100% sensitivity.
 For fuel fire – standard pan fire size: 1 ft 2 (0.1 m 2 ).
 For gas flame - 20 inch (0.5m) high, 8 inch (0.2m) width plume fire.
 Maximum Response Time: 10 sec.
Table 3: Fuel Sensitivity Ranges
Type Of Fuel
Percent of Max. Distance
at each Sensitivity Range
Max. Distance
(ft./m)
Gasoline 100% 215 / 65
N-Heptane 100% 215 / 65
JP5 70% 150 / 45
Kerosene 70% 150 / 45
Diesel Fuel 70% 150 / 45
Ethanol 95% 60% 135 / 40
IPA 60% 135 / 40
Methanol 55% 115 / 35
Methane 45% 100 / 30
LPG 45% 100 / 30
Paper 35% 33 / 10
Polypropylene 15% 16 / 5
Hydrogen 50% 100 / 30
Silane 8% 16 / 5
Ammonia 20% 40 / 12