5
AB-5798
Reference) About the Service Mode Menu
The Service Mode has six service menu items: OP1 to
OP6. However, only menu item OP2 is used in this
calibration.
OP2: Calibration menu
This operation involves calibrating the zero level of
the CO
2
concentration transmitter. When this
operation is executed, calibration is performed so that
the CO
2
concentration measured on the transmitter at
this time is taken as zero. When you execute this
operation, be sure to follow the above calibration
method.
＊
If you hold down the (-) button in the service mode for about
three seconds, that service mode menu item (see reference
page) is executed. (All LEDs (green, yellow, red) light.)
Do not execute menu items other than OP2.
Explanation of Pushbuttons
Button
Description
(
＋
) Button
Used to enter the service mode, and to advance the menu item in the service mode.
(
－
) Button
Used to enter the service mode, and execute the operation in the service mode.
Explanation of LEDs
Standard mode
Service mode
Green LED
Blinks during normal operation
Same as standard mode
Yellow LED
Lights when an error occurs.
Lights when the service mode is entered.
Red LED
Lights when the output range is exceeded.
Lights during execution of a service mode
menu item.
CO
2
concentration zero gas inlet
＋
－
(
＋
) button
(
－
) button
Yellow LED
Red LED
Green LED
LCD panel
