69 • Calibration Supplies and Equipment GX-6000 Operator’s Manual
Calibration Supplies and
Equipment
To calibrate the GX-6000, 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 full scale value. For example, if you are calibrating the catalytic
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.
CAUTION: When using auto calibration, although the GX-6000 can be
calibrated with an oxygen concentration of up to 19.5%, RKI
Instruments, Inc. recommends that the multi-gas cylinder have
an oxygen concentration in the range of 10% - 16% oxygen.
• A demand-flow regulator to provide adequate sample gas flow
NOTE: RKI Instruments, Inc. recommends that you dedicate a regulator for
use with chlorine (Cl
2
) gas and that you do not use that dedicated
regulator for any other gases, particularly hydrogen sulfide (H
2
S).
• Non-absorbent tubing
WARNING: If you are using a calibration kit that includes a gas bag and
a fixed flow regulator or dispensing valve, do not apply gas
directly to the GX-6000 with the regulator or dispensing valve
or damage to the pump will result.
To calibrate the %LEL, oxygen, CO, H
2
S, and PID sensors at the same time,
automatically, with no need for a zero-oxygen source, you can use the auto
calibration feature with either a 5-gas cylinder or a 4-gas cylinder and a PID
cylinder. This chapter includes instructions for both scenarios along with
instructions for calibrating one channel at a time using single calibration.
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