Multi 9420
pH value
ba75964e04
04/2015
35
Continuing with
three- to five-point
calibration
4.2.5 Calibration points
Calibration can be performed using one to five buffer solutions in any order
(single-point to five-point calibration). The meter determines the following
values and calculates the calibration line as follows:
20. Thoroughly rinse the sensor with deionized water.
21. Immerse the sensor in the next buffer solution.
22. When measuring without temperature sensor:
Enter the temperature of the buffer with
<
><
>
.
23. Start the measurement with
<ENTER>
.
The measured value is checked for stability (stability control).
The [AR] status indicator is displayed. The measured parameter
flashes.
24. Wait for the measurement with stability control to be completed or ter-
minate the stability control and take over the calibration value with
<ENTER>
.
The pH value of the buffer solution is displayed.
25. Set the nominal buffer value for the measured temperature with
<
><
>
.
26. Accept the calibration value with
<ENTER>
.
The calibration display for the next buffer appears (voltage display).
27. If necessary, use
<M>
to finish the calibration.
The calibration record is displayed.
or
Continue calibrating using the next buffer with
<ENTER>
.
After the fifth buffer has been measured the calibration is automat-
ically finished. Then the calibration record is displayed.
The calibration line is determined by linear regression.
03.04.2013 08:00
