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8 Maintenance
8.1
Good laboratory practice (GLP)
Good laboratory practice involves regularly monitoring the device and the
accessories. In the case of conductivity measurements, the correct calibration
of the relative cell constants must be ensured in particular. The device pro-
vides support in this regard with the functions "C.int" (calibration timer) and
"rEAD CAL" (calibration data display).
8.1.1
Calibration timer ("C.Int")
You can enter a fixed interval upon which the device will automatically remind
you that a new calibration needs to be performed.
The length of the interval depends on your application.
Once the interval has elapsed, "CAL" flashes in the display.
To set the interval see "Parameter "C.int": calibration timer", page 26
8.1.2
Reading the calibration data ("rEAd CAL")
The last calibration is stored in the device with the date and calibration values
and can be called up as follows.
✱
Press the
key for at least 2 seconds.
"Set ConF" appears in the display.
✱
Keep pressing the
key until "rEAd CAL." appears in the display.
✱
Briefly press the
key to switch the display between:
✱
Press the
key to stop reading the calibration data.
"Cal." and "FACt" are displayed alternately
in the main display
The value of the relative cell constant is shown in the subsidi-
ary display
"Cal." and "rEF" are displayed alternately
in the main display
The reference value with which the relative cell constant was
aligned is shown in the subsidiary display
The date of the data record is shown
in the main display
The time of the data record is shown in the
subsidiary display
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