INTRODUCTION
Thank you for purchasing General Tools & Instruments’ CGD900 Com-
bustible Gas Leak Detector with MSHA “Intrinsically Safe” approval.
Please read this user’s manual carefully and thoroughly before using
the instrument.
The CGD900 uses proven heated-sensor technology to detect the
presence of most combustible gases, including methane, propane,
butane, acetylene, and alcohol and gasoline vapors (see p.7 [Specifi-
cations section] for a longer list). In addition, its unique front-panel
readout indicates the relative size of a gas leak from 1 to 9.
This reading makes it easier to pinpoint the source of a leak and helps
you decide whether it is large enough to be worth plugging. The read-
ing, which is independent of the unit’s sensitivity level, rises and falls
with the amount of combustible gas sensed at the end of the CGD900’s
17-inch-long flexible and obedient probe. The maximum value is dis-
played when the tip of the probe is at the source of the leak.
The CGD900 is powered by four “AA” Alkaline (non-rechargeable)
batteries.
KEY FEATURES
• CE certified to meet European Union requirements
• MSHA Certified “Intrinsically Safe” in Methane-Air only
• Durable, stable sensor with industry-first two-year warranty
• Methane sensitivity of <5 ppm
• Calibrates automatically
• Unique numeric leak size indicator on front panel
• Three adjustable sensitivity levels
• Comfortable Sanoprene rubber grip
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CGD900 Manual_FINAL2_091410:Layout 1 9/14/10 1:32 PM Page 3
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