GX-3R Pro Operator’s Manual
Chapter 5: User Mode and Calibration
•
74
Performing a Calibration (GAS CAL)
Calibration Notes
• To fully calibrate the standard 4 (combustible gas, O
2
, CO, H
2
S) and super toxic sensors,
you must do a fresh air adjustment (
AIR CAL
) and a span adjustment (
AUTO CAL
).
• To fully calibrate the IR CO
2
sensor, you must do either a) a fresh air adjustment (
AIR
CAL
) and a span adjustment (
AUTO CAL
) or b) a zero adjustment (
CO2 ZERO CAL
)
and a span adjustment (
AUTO CAL
).
• Bump test the instrument before each day’s use with a known concentration of each target
gas. A bump test can be done in User Mode’s
BUMP TEST
item or by applying gas in
Measuring Mode. The instrument does not need to be calibrated unless it does not pass the
User Mode bump test or does not respond appropriately, as defined by the user, in
Measuring Mode.
• The hydrogen response for the H
2
-compensated CO sensor needs to be set monthly and
when the sensor is replaced.
Performing a Fresh Air Adjustment (AIR CAL)
1. Find a fresh air environment, an environment of normal oxygen content (20.9%) that is free of
toxic and combustible gases.
2. While in User Mode, use AIR to place the cursor next to
GAS CAL
.
3. Press and release POWER MODE. The Gas Cal menu appears.
4. Use AIR to place the cursor next to
AIR CAL
.
MAINTE
7:49
BUMP TEST
GAS CAL
CAL SETTING
USER MODE
MAINTE
7:49
AIR CAL
CO2 ZERO CAL
AUTO CAL
GAS CAL