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
