RKI Instruments GX-3R Pro - Page 78

GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 78
Performing a Span Adjustment in AUTO CAL
Preparing for a Span Adjustment
To perform a span adjustment on the GX-3R Pro, you will need:
• Known concentrations of the gases being detected.
• 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.
Concentration
Max. Cal.
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
Hydrogen (for H
2
-compensated CO
sensor); needs monthly calibration
25 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