108 • Appendix B: Gas Select Mode GX-3R Operator’s Manual
1 . While in Gas Select Mode, press AIR to scroll to SAVE-AP.
2 . Press and release POWER MODE. The display cycles through the following screens.
3 . Press and release POWER MODE to save the current alarm point settings as the default.
4 . The instrument returns to the SAVE-AP menu item.
5 . See “Exiting Gas Select Mode (START)” on page 111 to enter Measuring Mode.
Turning Calibration Max Span On/Off (MAX SPAN)
ON: After a passed calibration, the GX-3R displays the maximum possible adjustment it
could have made to the response reading. So if the combustible gas channel was calibrated
with 50% LEL gas and the maximum indicated span is 95% LEL, this means that there was
enough adjustment left on that channel to set the reading to 95% LEL when the detector was
exposed to 50% LEL gas. If the maximum span value is close to the calibration gas value, for
example if it is 53% LEL when exposed to 50% LEL gas, the sensor should be replaced soon.
The upper limit on the maximum adjustment indicated for all channels except for oxygen is
either twice the calibration value or full scale, whichever is lower. The upper limit on the
maximum adjustment indicated for the oxygen channel is 25.0% volume.
OFF (factory setting): There is no maximum span indication at the end of a calibration.
1 . While in Gas Select Mode, press AIR to scroll to MAX SPAN.
2 . Press and release POWER MODE. The current setting flashes.
3 . Use AIR to display the desired setting.
4 . Press and release POWER MODE to save the setting and return to the MAX SPAN
menu item.
5 . See “Exiting Gas Select Mode (START)” on page 111 to enter Measuring Mode.
SAVE-AP
M 7:49
SELECT
YES / MODE
M 7:49
SELECT
NO / AIR
M 7:49
SELECT
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