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If you recommend rejecting detectors based on sensitivity test results, make sure that your tester is in
calibration and would survive challenges from the manufacturer or Authority Having Jurisdiction. This is
especially important in dealing with borderline cases. For confirmation of test results, we suggest testing the
"accepted" and the "rejected" detectors of the same brand sequentially (one after the other or side by side)
using a common concentration level.
5.5
Calibration and Accuracy
Each instrument is individually calibrated. The calibration relates instrument sensitivity display readings to
smoke output in terms of its mass concentrations (mg/m 3 ) and to its corresponding UL 268 light obscuration
(%/ft) scales for ionization and photoelectric detectors.
The calibration is based on tests performed with pressure LED at green (15 psig), dilution air LED at green
(60 L/min) and aerosol temperature at 75 °F.
Estimated uncertainty based on our study relating detectors' sensitivity test results between the UL 268
Smoke box and the Gemini 501-B Tester is ± 0.4 %/ft (both operator and measurement errors).
5.6
Operational Precautions
(1) Attach drain reservoir to drain outlet before any operation.
(2) Empty the drain reservoir periodically.
(3)
Do not reuse oil from the drain reservoir.
(4)
Do not store Rudol
(5)
Change vacuum filter when the color turns red.
(6)
Cover nebulizer opening with orange cap when it is not in use to prevent dust from
getting in through the inlet opening (see page 18).
(7)
Remove nebulizer and drain reservoir before storage.
(8)
Only Rudol
used. Other mineral oil may not trigger alarms.
TM
*
Rudol
Oil left in a truck or car in hot summer days should be discarded because it would affect test result due to
viscosity change from polymerization at high temperature. To prolong shelf life, store the unused oil in refrigerator or
cold room.
TM
Oil at temperature above 85 °F for long period.*
TM
Liquid, which has a consistent viscosity and physical properties, can be
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