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Net Safety Monitoring
Absorbing Gases
A further potential inhibitor may be the presence of UV absorbing gases or
chemical vapours between the detector and source of potential fire. Such
gases could impede the detector's ability to detect a UV flame source. Small
concentrations of these gases may not be sufficient to obstruct the sensor but
high concentrations may impede the UV sensor. Moving the detectors closer
to the probable fire source and increasing the sensitivity can, in some
circumstances, overcome this issue (refer to Appendix A ).
Immune
The UV/IRS-H2 exhibits excellent immunity to many conditions/activities
including but not limited to the following:
steady hot body radiation
sunlight (direct/reflected)
MAN-0101 Rev 01 UVIRS-H2-A/H2-AR & UVIRS-H2-A-X/H2-AR-X
November 23, 2012
artificial lighting
arc welding radiation
R
ANGE
The practical application distance is directly related to the intensity of the
ultraviolet/infrared radiation source.
Table 1: Response Testing
Response Testing
Fuel
Size
Hydrogen(H2)
24" Plume
NOTE: The response time is based on zero time delay and maximum
sensitivity.
Average
Response
Distance
Time
(ft/m)
(Seconds)
55/16.7
1.8
6
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