RKI Instruments GX-86A - Manual (Page 21)

Model GX-86A Instruction Manual
Page 20 Hayward, California (510) 441-5656
CALIBRATION AND MAINTENANCE
The GX-86A’s microprocessor circuits provide advanced calibration and adjustment fea-
tures, including Demand Zero and Auto Calibration.
Note
Calibrate the GX-86A when a gas reading drifts below zero
or a sensor has been replaced.
Calibration Supplies and Equipment
For automatic one-source calibration, the RKI Four Gas Cylinder can
be used to adjust all sensors with one connection and one operation.
To calibrate the GX-86A with separate gas sources, you will need the
following supplies and equipment:
• Known calibrating samples of combustible and the appropriate
toxic gases. The samples should have concentrations in approxi-
mately the middle of the range of detection.
• An oxygen-free source, such as pure nitrogen or CO in a nitrogen
balance
• A flowmeter with a range of 0 - 1.0 SCFH
• A control valve/pressure regulator, non-absorbent tubing, and
adapter cups
Demand Zero and Calibration Preparation
1. Take the GX-86A to a non-hazardous location with fresh-air con-
ditions.
2. Turn on the instrument and allow 1 minute after the “OK” display
to warm up.