MSA Orion G Operating Manual page 54

Operating Manual
0.25 LPM. (See TABLE 8-1 for the correct MSA
part-numbered regulators.)
• Sensors -
Ensure that sensors are all present and in the
correct slots.
Ensure that the sensor has not exceeded its useful
life; replace the sensor if necessary.
• Tubing - Ensure that tubing is not blocked or kinked.
Occasionally, it is necessary to remove the limits and allow the
instrument to calibrate over a much wider window. For example:
the installation of a new sensor may require that the limits be
expanded, since the output of the new sensor may be much
higher than the old sensor it is replacing. This most often occurs
with oxygen and combustible (LEL) sensors.
To access the expanded tolerance window, press and hold the
ON-OFF/PAGE button on the Calibration Failure page for
approximately three seconds until it re-enters Cal mode. Make
sure the backlight is active before holding (if it doesn't go into
Cal after three seconds, let up on the button and retry).
Chapter 5, Calibration
5-7