Maintenance And Cleaning - YSI MultiLab IDS 4120 Operation Manual

4120(W) / 4130(W)
Refilling the
reference
electrolyte
ba76136e04 10/2017
NOTE
pH electrodes must not be stored dry or in deionized water. The elec-
trode could be permanently damaged by this. If the liquid in the
watering cap has dried up, condition the electrode in reference electro-
lyte (KCl 3 mol/l, Ag+ free) for at least 24 hours.
During longer storing periods, salt sediments may develop on the
watering cap. They do not affect the measuring characteristics
and can easily be removed with deionized water when the elec-
trode is put into operation again.
4 Aging
pH electrodes are consumables. Every pH electrode undergoes a natural
aging process. With aging, the responding behavior becomes slower and the
electrode slope and asymmetry change. Moreover, extreme operating condi-
tions can considerably shorten the lifetime of the electrode. These are:
 Strong acids or lyes, hydrofluoric acid, organic solvents, oils, fats, bro-
mides, sulfides, iodides, proteins
 High temperatures
 High changes in pH and temperature.
The warranty does not cover failure caused by measuring conditions and
mechanical damage.
5

Maintenance and cleaning

During operation, a small amount of reference electrolyte leaks through the
junction from the electrode into the test sample. If the level of reference elec-
trolyte becomes too low with time, refill it through the refilling opening. Refill-
ing is very easy with the enclosed dropping bottle. Proceed as follows:
 Cut off the tip of the dropping bottle at a right angle until the opening in the
tip can be seen
 Open the refilling opening of the electrode
 Press the tip of the dropping bottle into the refilling opening while turning
it slightly
 Pump the reference electrolyte in the shaft using the dropping bottle
 Pull the dropping bottle out of the refilling opening while turning it slightly
as necessary.
Aging
7