46 • Chapter 5: User Mode and Calibration GX-3R Operator’s Manual
Tips for Using User Mode
• To scroll from one menu item to the next, press and release AIR. To reverse the scrolling
direction:
a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.
c. The scrolling direction returns to the original direction when you exit and reenter a
menu.
• To skip an item when a question is asked, press and release AIR.
• To enter an item and to save any changes, press and release POWER MODE.
• To change a flashing parameter, press and release AIR. To reverse the direction of change
(ie. from increasing to decreasing or vice versa):
a. Press and hold AIR.
b. Immediately press POWER MODE and then release both buttons.
• To exit an entered menu item without saving a change, press and hold AIR and POWER
MODE for a few seconds.
Performing a Bump Test (BUMP)
Bump test the instrument before each day’s use with a known concentration of each target gas.
The instrument does not need to be calibrated unless it does not pass the bump test.
To bump test the GX-3R, you will need:
• Known calibrating samples 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 bump testing the combustible gas channel, your calibration
cylinder should have a combustible gas concentration between 10% LEL and 50%
LEL. 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 bump tested 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.
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