RKI Instruments GasWatch 1 - Manual (Page 8)

4 • Start Up GasWatch Instruction Manual (Two-Gas)
Start Up
1. Press the POWER button until the alarm light turns on (approximately 3 seconds).
The GasWatch temporarily tests all elements of the display screen, then displays the
battery voltage.
After several seconds, the GasWatch automatically displays the toxic gas normal
screen (CO or H
2
S),
then the GasWatch displays the oxygen normal screen. The GasWatch is in normal
operation.
Tip: You can test the oxygen sensor and alarm circuit by exhaling into the sensor. When
the display reading drops below the decreasing oxygen alarm point, the buzzer
should sound, the display reading should flash, and the alarm light should turn on.
2. Press the AIR button for approximately 3 seconds to set the zero reading (span for O
2
).
The buzzer sounds a pulsing tone while it is adjusting the readings (0 for H
2
S or CO;
20.9 for O
2
). Continue pressing the AIR button until the pulsing tone stops.
3. Use the wrist strap to attach the GasWatch to your wrist. The wrist strap has a velcro
section to ensure that the GasWatch remains secured to your wrist during operation.
(See “Accessories” on page 13 to install the
optional arm strap.
:
.
V
:
. ppm
H 2 S
:
. %
O 2