RKI Instruments GX-82A User Manual

Page 23

Model GX-82A Instruction Manual

Hayward, California (510) 441-5656

CALIBRATION AND MAINTENANCE

The GX-82A’s microprocessor circuits provide advanced calibration
and adjustment features, including Demand Zero and Auto Calibration.

Note

Calibrate the GX-82A 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-82A 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-82A 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.