Metrohm 739 Exchange unit - Manual (Page 35)

2. Changing the Exchange Unit
6.3013.XXX and 6.3014.XXX Exchange Units, 8.110.1346
35
Using original reagent bottles
You may need a special bottle siphon and/or a thread adapter.
The 6.1602.105 siphon makes part of the standard equipment.
Bottles with GL45 thread, e.g. Riedel-de Haën
(1 L), Baker
Standard
Bottles with S40 thread, e.g. Merck 6.1602.115
Bottles with GL32 thread, e.g. Fluka, Riedel-de
Haën (500 mL)
6.1602.105 +
6.1618.000
Bottles with 28 mm thread, e.g. Fisher 6.1602.105 +
6.1618.010
2. Changing the Exchange Unit
Before mounting the Exchange Unit onto the Dosimat/Titrino,
check if you can turn the stopcock manually. If the stopcock is
blocked, see section 4.
Mount the Exchange Unit onto the Dosimat/Titrino and lock it into
place.
The Dosimat/Titrino has to be in the zero position for mount-
ing/removing the Exchange Unit.
If an Exchange Unit can not be mounted, adjust the coupling of
the PTFE piston with the 6.2739.010 key (it has to be flush with
the ridge on the bottom of the Exchange Unit).
Note:
If no liquid is aspirated into the glass cylinder upon filling - despite
a filled reagent bottle and correct tubing connections - the cylin-
der can be under vacuum. In this case, it may be dangerous to
remove the Exchange Unit (the cylinder may break). Aerate the
cylinder by opening the tubing connection at the head of the cyl-
inder.
Always use the Exchange Unit with light protection jacket
(protection if the cylinder breaks).