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The Gemini 501-B Smoke Detector Analyzer/Aerosol Generator is an instrument ideally suited to measure
the sensitivity response of installed smoke detectors. The Generator produces an aerosol with particles size
characteristics resembling fire smoke. The range of concentration, between 0 and 45 mg/m 3 or from 0 to 4
%/ft obscuration (UL-268), is sufficient to trigger the alarm thresholds of all UL-approved ionization and
photoelectric smoke detectors.
The calibration reading for each instrument represents both the UL-268 obscuration standard in (%/ft) and to
aerosol mass concentration in (mg/m 3 ). The calibration reading on the LCD allows the operator to determine the
sensitivity of the detector and compare it to the range specified by the manufacturer as printed on the back of
each detector.
The instrument can save a considerable amount of time for inspection personnel who must remove detectors
from ceiling positions for periodic cleaning or testing. Using the hose, wands, and shroud, test smoke is
delivered to the detector without removing it from the ceiling. From the test results, inspectors can decide
whether to remove the detector for cleaning or sensitivity adjustment.
The current NFPA 72 Fire Alarm Code (1996) recommends sensitivity inspection of installed detectors within
one year after installation and every alternate year thereafter.
Aerosol Characteristics
Particle size
Number median diameter......................... 0.2 micrometer (um)
Mass median diameter ............................. 0.45 um
Repeatability............................................. ± 5 %
Generation Characteristics
Test stream flow rate ................................ 60 L/min.
Aerosol flow rate....................................... 0 - 4.2 L/min.
Concentration Range
Adjustable................................................. 0 - 40 mg/m3 (0 - 4 %/ft obscuration)
Reset, concentration ................................ ±4%
Type of aerosol......................................... Rudol
Operating temperature ............................. 24 ±3°C (75 ±5°F)
Mechanical Characteristics
Dimensions, overall .................................. 9.5 x 6.5 x 7 in. (24.1x 16.5 x 17.8 cm)
Weight, approximately .............................. 11 lb. (5.0 kg), with battery
Hose length .............................................. 5 ft. (1.5 m)
Oil Reservoir Volume ..................................... approx. 30 ml
Power Requirement ....................................... 12 V DC, 6.5 Amp-Hr Ni-MH Battery
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RUDOL oil, a NF-grade white mineral oil, aromatics-free, saturated aliphatic hydrocarbons. Viscosity = 29 centistokes @40 C. Specific
gravity = 0.87 @25 °C. RUDOL is a registered trademark of Witco Chemical Corp. It conforms to the FDA-CFR 172.878,
which allows for direct skin & food contacts and stabilized with Vitamin E for long shelf life.
1.0 Introduction
2.0 Specifications
TM
Oil *
2
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