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5 FUNCTION
5.3
Automatic Zero Calibration
To secure a stable measurement value, zero calibration is performed automatically at a
constant interval. Zero calibration is performed for turbidity, color and residual chlorine
measurements. Zero-standard solution which filtered sample water is used.
Note
To perform the automatic zero calibration, set the EXT I/O IN to OFF. For details, see "5.2.1 Setting EXT
I/O IN" (page 79) .
The following settings are available for zero calibration.
Setting
Setting ON/OFF of ZERO CAL.
（5.3.1, page 82）
Calibration interval
（5.3.2, page 83）
STANDARD TIME
（5.3.3, page 83）
Displaying CALIBRATION SETTING screen
MEAS. screen
See " Displaying the maintenance item screen" (page 77).
1. Press [CALIBRATION] on the SETTING 1/2 screen.
The CALIBRATION SETTING screen is displayed.
5.3.1
Setting ON/OFF of ZERO CAL.
[MAINTE.]
MAINTENANCE screen
MEAS. screen
See " Displaying CALIBRATION SETTING screen" (page 82).
1. Press the ZERO CAL. button on the CALIBRATION SETTING screen.
The ZERO CAL. SETTING screen is displayed.
2. Select [ON] or [OFF], and press [SET].
The screen returns to the CALIBRATION SETTING screen.
82
Specifies whether ZERO CAL. is activated or not.
Sets the calibration interval.
Sets the time to perform zero calibration. Performs
zero calibration periodically from the specified time.
[MAINTE.]
MAINTENANCE screen
[CALIBRATION SETTING]
[SETTING]
SETTING1/2 screen
[ON]
/[OFF]
Explanation
[SETTING]
SETTING1/2 screen
[CALIBRATION SETTING]
Initial Setting
ON
24 hours
2004/01/01/00:00
[CALIBRATION SETTING]
screen
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