RKI Instruments GX-86A - Manual (Page 31)

Model GX-86A Instruction Manual
Page 30 Hayward, California (510) 441-5656
the start-up sequence and after the Demand Zero command.
3. The O
2
reading tends to drift with instrument orientation.
Toxics Sensors
Replace the sensor when:
1. The detection circuit cannot be calibrated correctly.
2. The display does not show 0 (CO) or 00 (H
2
S) immediately after
the start-up sequence and cannot be set to zero by Demand Zero.
Note
Allow up to 1/2 hour after the toxics sensors have been
replaced to show a normal response, then calibrate.
Sensor Replacement
1. Take the GX-86A to a non-hazardous location and turn the power
off.
2. Remove the instrument from the carrying case.
3. Press in the cover latch and slide the sensor cover down and away
from the instrument case.
4. To replace individual sensors, press down and turn counter-clock-
wise, then pull out of block. Figure 4. shows the installation of the