RKI Instruments GX-82A - Manual (Page 33)

Model GX-82A Instruction Manual
30 Hayward, California (510) 441-5656
O
2
Sensor
Replace the O
2
sensor when:
1. The O
2
circuit cannot be set to 00.0% on an oxygen-free sample.
2. The OXY (O2) display does not show 20.9% immediately after
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-82A 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.