5 How to Operate
5-6. Description of operation (maintenance)
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5-6-2. Zero adjustment
This is used to perform the zero adjustment.
NOTE
If the zero calibration failed since the zero point was significantly fluctuated from zero, or by other
reasons, it returns to 1-1 after FAIL 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. Zero Adjustment" menu
displayed.
Introduce a zero adjustment gas. When the reading is stabilized,
press the SET switch. The display blinks and zero adjustment is
performed.
(3) Press the SET switch to confirm the setpoint.
When the process ends normally, the LCD displays PASS and
then goes to "1-1. Zero Adjustment" screen.
(4) Hold down the MODE switch over three seconds to return to the
detection mode.
WARNING
Do not turn off the power until PASS disappears.
WARNING
After the adjustment is completed, never fail to hold down the MODE switch over three seconds to
return to the detection mode.
CAUTION
If the unit remains in the maintenance mode, it automatically returns to the detection mode in ten
hours.
