GX-3R Pro Operator’s Manual Chapter 5: User Mode and Calibration • 64
AUTO BACK-
LIGHT (page 108)
ON (factory setting): The instrument’s backlight automatically turns on in a low light
environment.
OFF
: The instrument’s backlight does not automatically turn on in a low light environ-
ment.
BACKLIGHT TIME
(page 108)
How long the back light stays on after the last button press.
Options: 0 - 255 seconds or OFF. The factory setting is 30 seconds.
KEY TONE (page
109)
ON
(factory setting): Buzzer sounds when a button is pressed.
OFF
: Buzzer does not sound when a button is pressed.
D MODE
SETTING (page
109)
OFF
: LIST, USER ID, STATION ID, INVERT SELECT, LCD BACKGROUND,
BLUETOOTH, BUZZER VOLUME, and LANGUAGE items do not appear in Dis-
play Mode.
ON
(factory setting): LIST, INVERT SELECT, LCD BACKGROUND, BLUE-
TOOTH, BUZZER VOLUME, and LANGUAGE items appear in Display Mode.
USER ID and STATION ID screens appear if ID DISPLAY in Maintenance Mode is
also set to ON.
ZERO SUPPRESS
(page 110)*
ON
(factory setting): Not intended for field adjustment. The suppression values are:
Combustible Gas: 2% LEL
O
2
: 0.5% volume
H
2
S: 0.3 ppm
CO: 2 ppm
CO
2
: 0 ppm
HCN: 0.5 ppm
NH
3
: 4 ppm
NO
2
: 0.30 ppm
PH
3
: 0.02 ppm
SO
2
: 0.20 ppm
ZERO
FOLLOWER (page
110)**
Not intended for field adjustment. The default setting is ON for every channel except
oxygen. Oxygen channel does not support zero follower functionality.
IR UNIT SELECT
(page 111)***
Select the units for the IR CO
2
sensor.
Options: vol% or ppm
CO2AIR
SETTING (page
111)***
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.
DATE (page 112) Set the current date and time.
Table 9: User Mode Items
User Mode
Menu Item
Description
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