193
•
Appendix C: Gas Select Mode
GX-3R Pro Operator’s Manual
Turning the Calibration Max Span On/Off (DISP 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, use AIR to place the cursor next to
DISP 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 Gas Select Mode.
5. See “Exiting Gas Select Mode (START MEASURE)” on page 199 to return to Measuring
Mode.
Stealth and Vibrator Settings (STEALTH)
STEALTH
ON
:
• The instrument’s backlight does not come on, regardless of the
BACKLIGHT TIME
setting.
• The instrument’s LEDs do not come on for any reason, even alarm conditions.
• The instrument’s buzzer does not sound for any reason, even alarm conditions.
• An “S” appears at the top of the LCD.
OFF
(factory setting): The instrument’s backlight and LEDs operate normally.
MAINTE
7:49
SET DEF ALM-P
DISP MAX SPAN
STEALTH
GAS SELECT MODE