Xylem PH3210 FIELD PH METER - Manual (Page 39)

pH 3210 Operation
39 ba75793e02 12/2008
Preparatory activities Perform the following preparatory activities when you want to calibrate:
4.4.6 Calibration interval
The calibration evaluation is indicated on the display as a sensor
symbol.
The sensor symbol flashes after the adjusted calibration interval has
expired. It is still possible to measure.
Note
To ensure the high measuring accuracy of the measuring system,
calibrate after the calibration interval has expired.
Setting the calibration
interval
The calibration interval is set to 7 days (d7) in the factory.
You can change the interval (1 ... 999 days):
1 Connect the pH combination electrode to the meter.
The pH measuring window is displayed.
2 Keep the buffer solutions ready. Adjust the temperature of the
buffer solutions, or measure the current temperature, if you
measure without a temperature sensor.
1 Open the menu for measurement settings with <F1>/[Menu].
2 In the Calibration / Calibration interval menu, set the calibration
interval with <
▲><▼>.
3 Confirm the setting with <ENTER>.
4 Exit the menu with <M>.