Metrohm 756 KF Coulometer - Manual (Page 124)

6.2 Connecting Coulometer to Dosino
756/831 KF Coulometer, Instructions for Use 116
3. Screw 6.1602.105 bottle attachment onto the waste bottle, fill adsorber tube with mo-
lecular sieve and place it in the bottle attachment. Close the larger threaded opening
of the bottle attachment with 6.1446.080 stopper.
4. Place the waste bottle in the bottle holder. Connect the bottle attachment and Port 3 of
the dosing unit with 6.1805.080 tubing.
5. Equip the titration vessel with the aspiration equipment, see below. The aspiration
equipment consists of 6.1543.070 tip, nipple from 6.2730.030 (use E.301.0022 O-ring
instead of the thin O-ring of the nipple) and 6.1446.060 stopper.
6. Connect the aspiration tip and Port 1 of the dosing unit with 6.1805.060 tubing.
6.2.2 Equipping the titration vessel for aspiration
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 correct length and use for all the joints of
the inserts 1) .
4. Insert indicator electrode in the left-hand joint opening, screw on 6.2104.020 elec-
trode cable and plug it into the "Ind.El" socket of the Coulometer.
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 Coulometer.
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. Screw tip with the nipple and O-ring from 6.2730.030 into 6.1446.060 stopper and
insert this into the last joint opening.
9. Connect the tip to Dosino Port 1.
10. Connect Dosino Port 3 to the waste bottle.
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.
Drying tube
Generator electrode
Indicator electrode
Septum stopper
Tip
Nipple from
6.2730.030
6.1446.060
Stopper