111 • Chapter 5: User Mode and Calibration GX-3R Pro Operator’s Manual
Reading Units for IR Sensor (IR UNIT SELECT)
This menu item only appears if a CO
2
sensor is installed. IR UNIT SELECT changes the IR
sensor’s units.
vol%: CO
2
readings displayed in percent volume
ppm: CO
2
readings displayed in parts per million
1. While in User Mode, use AIR to place the cursor next to IR UNIT SELECT.
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 User Mode.
5. See “Returning to Measuring Mode (START MEASURE)” on page 117 to return to
Measuring Mode.
CO
2
Fresh Air Adjustment On/Off (CO2AIR SETTING)
This menu item only appears if a CO
2
sensor is installed.
ON: CO
2
channel is set to 400 ppm (0.04% volume) during a demand zero, auto zero, or AIR
CAL.
OFF (factory setting): CO
2
channel is not adjusted during a demand zero, auto zero, or AIR
CAL.
1. While in User Mode, use AIR to place the cursor next to CO2AIR SETTING.
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 User Mode.
MAINTE 7:49
D MODE SETTING
IR UNIT SELECT
CO2AIR SETTING
USER MODE
MAINTE 7:49
IR UNIT SELECT
CO2AIR SETTING
DATE
USER MODE
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