RKI Instruments GX-82A - Manual (Page 24)

Model GX-82A Instruction Manual
062796 RKI Instruments, Inc. 21
3. Demand Zero
Press and hold the AIR/▲ switch on the control panel until a tone
sounds. Follow the instructions on the display:
The instrument will automatically set the LEL and toxic gas
circuits to zero and the O
2
circuit to 20.9%.
Calibration Start-up
1. Preparation
Assemble the calibration cylinder (Four-Gas for Auto Calibration,
or a specific cylinder for separate gas calibration), valve/regulator,
flowmeter, and adapter cup.
Note
Allow adequate time for the GX-82A to respond to changes
in adjustment. Adjust the controls in small increments, then
wait approximately 3 seconds for a change in reading.
Ignore alarms during the calibration procedure.
DEMAND ZERO
HOLD AIR KEY
ADJUSTING ZERO
HOLD AIR KEY
ZERO ADJUSTED
RELEASE AIR KEY