RKI Instruments GX-94 - Manual (Page 35)

GX-94 Operator’s Manual Page 34
with the fixed flow regulator and RKI Four Gas Cylinder. It also includes
instructions for calibration with individual gas sources.
Preparation
1. Take the GX-94 to a non-hazardous location with fresh-air condi-
tions.
2. Turn on the instrument and allow one minute to warm up.
3. Perform a demand zero.
Press and hold the AIR/ ▲ button on the control panel until. The
instrument will indicate on the display that it is adjusting the zero
settings. Keep pressing the AIR/
▲ button until the display indicates
“ZERO ADJUSTED RELEASE AIR KEY”.
The instrument will automatically set the LEL and toxics circuits to
zero and the O
2
circuit to 20.9%.
4. Screw the adapter plate to the threaded hole in the sensor screen.
5. Connect the calibration tubing from the adapter plate to the regula-
tor.
Note
Do not screw the fixed flow regulator onto the cylinder at this
time since sample will automatically start to flow.
Calibrating the GX-94
Press and hold the (SHIFT)/ ▼ button, then press the DISPLAY/(ADJ.)
button to enter calibration mode. The calibration menu will show the fol-
lowing screen with a flashing number indicating the cursor position:
1.AUTO CAL
2.SET SPAN
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