RKI Instruments GX-3R User Manual

52 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
Performing a Calibration (GAS CAL)
Calibration Notes
• To fully calibrate the sensors, you must do a fresh air adjustment (AIR 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 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 only needs to be set when the
sensor is replaced.
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, press AIR to scroll to GAS CAL.
3 . Press and release POWER MODE. The AIR CAL menu item appears.
4 . Press and release POWER MODE to enter the AIR CAL menu.
5 . Make sure the GX-3R has been turned on for at least 45 seconds before continuing.
6 . Press and hold AIR until the screen prompts you to release it.
7 . If the fresh air adjustment passes, the instrument returns to the GAS CAL menu.
GAS CAL
M 7:49
AIR CAL
M 7:49
AIR CAL
M 7:49
0 0.0
CO ppm H2S ppm
0 20.9
CH4 %LEL O2 %
HOLD AIR
M 7:49
Air CAL
RELEASE
M 7:49
Adj

RKI Instruments GX-3R Specifications

General

Brand	RKI Instruments
Model	GX-3R
Category	Measuring Instruments
Language	English