D. MEASUREMENT TECHNIQUES
1. Controls and Functions:
Push Buttons
Short Press: Turns the 721 on.
Long Press (3 seconds): Turns
the 721 off.
Short Press: Silences the alarm.
Long Press (3 seconds): Activates
Menu Mode.
Short Press: Activates sensor
zero.
Long Press (3 seconds): Turns
the backlight on and off.
Thumb Controls speed of tick rate
Wheel
6 7
3. Specifications
Leak Detection Sensitivity (methane): 10ppm
Gases Detected (partial listing): Acetone, Acetylene, Alcohol,
Ammonia, Benzene, Butane, Ethanol, Ethylene Oxide, Gasoline,
Hexane, Hydrogen, Methane, Naphtha, Natural Gas, Paint Thinners,
Propane, Solvents
Display Type: Dual display with backlight
Display Modes: Real (ppm), Leak Level (stepped ppm), %LEL
Ranges: Real ppm: 0 to 9999ppm
Stepped ppm: 0, 500, 1000, 3000, 5000, 9999ppm
%LEL: 0 to 19.9%
Audible Leak Indication: Adjustable tic rate via side thumb wheel
Alarm Indication: Visual and audible (User adjustable alarm level)
Sensor Test and Zero: Automatic at start up
Goose Neck: 16” long with visual alarm indicator in sensor housing
Operating Temperature: 32 to 122 (0 to 50)
Gooseneck Length: 16 inches
Battery Type: “C” size Alkaline (2)
Size: 9.4” x 2.9” x 2.2” (240mm x 74mm x 55mm)
Weight: 1 lb (454g)
721 manual_082208.qxd 11/11/2008 7:09 AM Page 6
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