RKI Instruments GX-86A - Manual (Page 27)

Model GX-86A Instruction Manual
Page 26 Hayward, California (510) 441-5656
near the level of the low concentration sample. Adjust the reading
using the AIR/▲ or (SHIFT)/▼ switches.
5. Press ON/OFF/ENTER to complete the oxygen zero sequence.
6. Turn off the zero oxygen cylinder and disconnect it from the valve.