GX-3R Operator’s Manual Chapter 5: User Mode and Calibration • 53
8 . If the fresh air adjustment fails, “FAIL AIR” displays. Press and release POWER MODE
to acknowledge the failure. See “Troubleshooting” on page 79.
Performing a Span Adjustment in AUTO CAL
Preparing for a Span Adjustment
To adjust the span on the GX-3R, you will need:
• Known concentrations of the gases being detected.
The combustible and toxic gas samples should have concentrations between 10 and
50% of the detection range. For example, if you are calibrating the combustible gas
channel, your calibration cylinder should have a combustible gas concentration
between 10% LEL and 50% LEL.
If you are setting the H
2
response for the H
2
-compensated CO sensor (which only
needs to be done when the sensor is replaced), 200 ppm H
2
is recommended.
An oxygen-free source, such as 100% nitrogen is recommended for setting the
oxygen zero but a concentration of up to 19.5% is acceptable.
CAUTION: Although the GX-3R can be calibrated with an oxygen concentration of up to
19.5%, RKI Instruments, Inc. recommends that a multi-gas cylinder have an
oxygen concentration in the range of 10% - 16% oxygen.
• 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
1 . Confirm that the GX-3R’s calibration gas values match the concentrations listed on the
calibration gas cylinder(s) as described on pg.58.
2 . Confirm that your cylinder selections are appropriate as described on pg.60.
3 . Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM
fixed flow regulator onto the calibration cylinder.
4 . Install the calibration cup onto the GX-3R. Use the label and imprinting to make sure
that the calibration cup gets installed in the correct orientation relative to the GX-3R. Be
sure the calibration cup is pushed on all the way.
GX-3R
AIR
POW ER
MODE
CO/H
2
SLELO2
FRONT
Inlet
Figure 8: Calibration Cup Installation
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