2 titration vessel setup – Metrohm 756 KF Coulometer User Manual

Page 13

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2.2 Titration vessel setup

756/831 KF Coulometer, Instructions of Use

5

2.2 Titration vessel setup

1) When cutting the ground joint sleeves take care that no rough

edges are formed. The ground joint sleeves must not project

beyond the lower edge of the joint.

If no ground joint sleeves are used then the joints must be

greased. In this case the joints must be checked periodically

and re-greased while otherwise problems with blocked joints

could occur.

2) For the generator electrode with diaphragm: Fill the generator

electrode with approx. 5 ml catholyte. Fill the titration vessel with

anolyte until the anolyte level is 1-2 mm above that of the ca-

tholyte (approx. 100 ml).

1. Attach titration vessel with holder to the support

rod.

2. Place stirring bar in titration vessel.

3. Cut 6.2713.XXX ground joint sleeves to the cor-

rect lengths and use them for all the joints of the

inserts

1)

.

4. Insert indicator electrode in the left-hand joint

opening, screw on 6.2104.020 electrode cable

and plug it into the "Ind.El" socket of the Coulom-

eter.

Mark the screw head of the electrode cable so

that it is impossible to confuse the indicator and

generator electrodes!

5. Insert generator electrode in the central joint

opening, screw on 6.2104.120 electrode cable

and plug it into the "Gen.El" socket of the Cou-

lometer.

6. Fill the drying tube with molecular sieve and insert

into generator electrode.

7. Place septum in the screw cap and screw this

onto the titration vessel. Only tighten it enough to

ensure that it is tight. (The septum should not be

deformed!)

8. Fill titration vessel with 80-100 ml reagent

2)

.

9. Close last joint opening: either with glass stopper,

aspiration device or gas inlet from oven (see

pages 114ff).

Drying tube

Generator

electrode

Stirring bar

Septum stopper

Indicator

electrode

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