5. How to Operate
5-6. Description of operation (maintenance)
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5-6-2. Fresh air adjustment
This is used to perform the fresh air adjustment.
NOTE
If the zero calibration failed since the zero point was significantly fluctuated from around zero, or by
other reasons, it returns to 1-1 after FAIL rather than PASS is displayed. In this case, the zero
adjustment has not been completed.
(1) Hold down the MODE switch over three seconds to enter the
maintenance mode.
(2) Press the SET switch with the "1-1. Fresh Air Adjustment" menu
displayed.
Draw a zero adjustment gas. When the reading is stabilized, press
the SET switch again. The display blinks and fresh air adjustment
is performed.
(3) Press the SET switch to confirm the setpoint.
WARNING
Do not turn off the power until PASS disappears.
When the process ends normally, the LCD displays PASS and then
goes to "1-1. Fresh Air Adjustment
”
.
(4) Hold down the MODE switch over three seconds to return to the
detection mode.
WARNING
After the adjustment is completed, never fail to press the MODE switch to return to the
detection mode.
CAUTION
If the buzzer unit remains in the maintenance mode, it automatically returns to the detection
mode in ten hours.
1 - 1
PASS
AIR
1 - 1
AIR
1 - 1
20.5
AIR
1 - 1
20.9
AIR
1 - 1
AIR
20.9
O2
