67 • Chapter 5: User Mode and Calibration GX-3R Pro Operator’s Manual
• 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 TEST)
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 Pro, you will need:
• Known calibrating samples of the gases being detected
• A 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
1. Confirm that the GX-3R Pro’s calibration gas values match the concentrations listed on the
calibration gas cylinder(s) as described on page 85.
2. Confirm that your cylinder selections are appropriate as described on page 88.
Channel
Min. Cal. Gas
Concentration
Max. Cal. Gas
Concentration
Combustible Gas 5% LEL 75% LEL
Oxygen 0.0% 18.0%
Hydrogen Sulfide 1.0 ppm 200.0 ppm
Carbon Monoxide 15 ppm 2,000 ppm
Ammonia 8 ppm 400 ppm
Carbon Dioxide (0 - 10,000 ppm) 3,000 ppm 9,000 ppm
Carbon Dioxide (0 - 10.00% vol) 1.00% vol 4.00% vol
Hydrogen Cyanide 0.9 ppm 30.0 ppm
Nitrogen Dioxide 0.50 ppm 20.00 ppm
Phosphine 0.05 ppm 20.00 ppm
Sulfur Dioxide 0.50 ppm 100.00 ppm
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