Operation
multi EA 4000 Version 01.16 65
After cooling down to (18 – 22) °C slowly add solution B1 to solution B2 whilst mixing,
filter, transfer to a 1000 ml measuring flask and fill with water up to the marking.
5. solution C – ready electrolyte:
pipette 8 ml of solution B into a 100 ml measuring cylinder and fill with solution A to 100
ml or
pipette 40 ml of solution B into a 500 ml measuring cylinder and fill with solution A to
500 ml.
Storage and durability of the electrolyte solutions
Solutions A and B last approx. 6 months if stored in tightly sealed bottles at 4 ± 3 °C.
The ready electrolyte solution (solution C) lasts approx. 30 days in tightly sealed
glass containers at 20 – 25 °C.
7.4.3 Making the measuring cell available
CAUTION
If the electrolyte dries on the combination electrode this may cause an irreversible damage
of the electrode.
During a brief pause in operation, for example from one day to the next,
store the electrode in the electrolyte solution.
IMPORTANT
Leave the electrode for 1
-2 h in electrolyte solution prior to first use. Reproducible values are
only possible after that.
The filled measuring cell and the electrode must be connected to the device
before the Cl
1. Fill the electrolyte into the basic body of measuring cell (for the preparation of the
electrolyte see section "Preparing the electrolyte solution" p. 64):
− "sensitive" cell: approx. 20 ml
− "high concentration" cell: approx. 120 ml
2. Place a magnetic stirring rod onto the floor of the measuring cell.
3. Attach the measuring cell lid using the 3 knurled head screws.
4. Place the measuring cell into the holder of the Cl module.
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