pH/Oxi 340i
Operation
37
4.4.5
D. O. calibration
Why calibrate?
D. O. probes age. This changes the slope of the D. O. probe. Calibra-
tion determines the current slope of the probe and stores this value in
the instrument.
When to calibrate?
l
After connecting another D. O. probe
l
When the probe symbol flashes (after the calibration interval has ex-
pired).
Calibration procedures
The calibration is performed in water vapor-saturated air. Use the
OxiCal
®
-SL air calibration vessel (accessories) for the calibration.
AutoRead
The calibration procedure automatically activates the AutoRead func-
tion. The AR display indicator flashes. The calibration process is fin-
ished when AR stops flashing.
Displaying the calibra-
tion data
You can view the data of the last calibration on the display. The pro-
ceeding is described on page 48.
Printing the
calibration protocol
The calibration record contains the calibration data of the current cali-
bration. You can transmit the calibration protocol to a printer via the se-
rial interface (see page 50).
Note
You can automatically print a calibration protocol after the calibration.
To do so, connect a printer to the interface according to section 4.7.2
before calibrating. After a valid calibration, the record is printed.
