Metrohm 827 pH lab - Manual (Page 58)

8.4 Maintenance
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826/827 pH meter, Instructions for Use
 Exchange the existing four batteries for four new ones, type
LR6/AA/AM3,1.5 V (Metrohm order number 6.2133.000).
 Take care of the correct polarity of the batteries! The correct ar-
rangement is shown in the battery compartment.
 Reattach the base plate with the six screws. Tighten the screws
firmly (always crosswise) to ensure that the housing is tight.
 Switch on the pH meter. The following message is displayed:
set date and time
 Set the date and time correctly (see section 5.4).
Note!
In case that no electrode or no temperature sensor (mode T only) has
been connected, the message above is overlaid by the message
overrange and is therefore not visible anymore.
8.4.2 Changing the batteries (827 only)
The 827 pH lab contains two batteries (type LR6/AA/AM3, 1.5 V) for the
correct date and time as well as for switching on the instrument. In or-
der to prevent leakage, the batteries should be replaced after approx-
imately five years. The instrument reminds you of changing the batteries
by displaying the message "battery low" and the symbol . The
measurement accuracy is not affected at all.
Proceed as follows:
 Switch off the pH meter.
 Unscrew the five recessed head screws on the base of the housing
and remove the base plate.
Fig. 6: Changing the batteries for the 827 pH lab
 Continue as described in the previous chapter.