Xylem Lab 850, starting from serial number 09470315 - Manual (Page 27)

Lab 850 Operation
27 ba75890e01 11/2009
4.4.1 Calibration interval (Int.C)
The calibration interval and calibration evaluation are indicated on the
display as the CalClock.
CalClock
The remaining time of the calibration interval is indicated by the
segmented ring around the calibration evaluation. This segmented ring
reminds you to calibrate regularly.
After the specified calibration interval (Int.C) has expired, the outer ring
of the CalClock flashes. It is still possible to measure.
Note
To ensure the high measuring accuracy of the meter, calibrate after the
calibration interval has expired.
Setting the calibration
interval
The calibration interval (Int.C) is set to 7 days (d7) in the factory.
You can change the interval (1 ... 999 days):
1 Open the menu for measurement settings with <MODE
_
>.
2 Confirm all settings with <OK> until Int.C is displayed.
3 Set the calibration interval with <
▲><▼>.
4 Confirm the setting with <OK>.
8 D
C T N 1
pH
Time