Xylem CG 842 - Manual (Page 20)

Operation
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4 Operation
4.1 Switch on the instrument
Note
The instrument has an energy saving feature to avoid un-
necessary battery depletion.
The energy saving feature switches the instrument off if no
key has been pressed for an hour.
The energy saving feature is not active if the instrument is
supplied by the plug-in power supply.
1 Place the instrument on a flat surface and protect it
against intense light and heat.
2 Press the <on/off> key.
The display test appears briefly on the display.
The instrument then switches automatically to the
previously selected measuring mode.
3 Connect the pH electrode to the instrument.
The measuring instrument is ready for operation.