Metrohm 827 pH lab - Manual (Page 27)

4 Short operating tutorial
826/827 pH meter, Instructions for Use
19
6 Possible error messages
• In case buffer pH 7 has been measured again by mistake, the
following message is displayed:
same buffer
Change the buffer and press <OK>. The calibration is being
continued. The calibration can be canceled with <QUIT>.
• If the temperature difference is > 2 °C between the buffers,
the following message is displayed:
delta T > 2 °C
Adjust the temperature and continue the calibration with
<OK> or cancel it with <QUIT>
4.3 pH measurement
1 Select print criterion
• If the obtained measured value is to be printed out directly as
a measuring point report then the required print criterion must
be set (see Section 5.2):
configuration/print crit.: drift
2 Start measurement
• Immerse the pH electrode in the sample
3 Determine measured value
• You can read off the current pH value of the sample from the
display. It is stable when the message drifting... is no
longer being displayed (preset drift threshold: 0.028 pH/min) 1
4
.
Print measured value
• Change to the menu << print >> with the arrow keys <>
or <>.
• The output of a measuring point report on a printer is started
with <OK>. Due to the print criterion drift the recording of
the measurement and its output takes place only when the
measured value is stable:
1 Further preset drift thresholds:
for potential measurement: U/mV: 1.875 mV/min, for temperature measurement: t/°C: 0.974 °C/min
'mp
827 pH lab 01106 5.827.0010
print date 2005-02-08 15:43:01
pH = 4.612 22.8 °C NTC
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