SCHOTT Instruments Pb 1100 A Bedienungsanleitung Seite 17

Combination Electrode PB 60
Halfcell Pb 1100 A
Commissioning
The combination electrode is now ready to measure. Always
leave the refilling opening of the reference electrode open
while measuring.
For measurements using the Pb 1100 A lead electrode, an
additional reference electrode is required. The two
electrodes together form a combination electrode.