multi X 2500
Function and layout of the multi X 2500
41
3.6.2
Manual boat feed (MBD)
The sample feeding module MBD (manual boat drive) is a sample introduction system
for AOX determination and the analysis of inert solids in horizontal operating mode.
The MBD is used for transporting the quartz boats (40 mm x 9 mm) into the multi-
purpose combustion tube. The quartz boats can be loaded with quartz containers with
activated carbon (column method) or with filters with filter cakes (batch method). For
safety reasons the analysis of liquid samples is not permitted.
Fig. 38 Manual boat feed (MBD)
1 Connection cable
2 Bracket
3 Connection piece with seal
4 Hook
5 Guide tube
6 Handle for sliding the hook
7 Lever for opening and closing the sluice
The guide tube includes a hook with magnetic coupling which is used to move the
loaded quartz boat. Opening and closing the sluice and transferring the samples into
the combustion tube are performed manually.
The MBD is hooked to the three fastening screws on the combustion furnace by its
bracket. MBD and combustion tube are connected using a connection piece which is
screwed onto the combustion tube. It ensures that the connection is gas tight.
The MBD is connected to the interface in the device interior (3 in Fig. 5 on page 20)
using the connection cable. The MBD is then identified by the multiWin software.
Argon is used as carrier and cooling gas. For this purpose, the MBD is connected to the
"OUT ABD" gas outlet of the multi X 2500 using the connection hose (6 in Fig. 7 on
page 22).
3.7
Pre-combustion adapter
The pre-combustion adapter is an optional accessory for samples which are wet and
which must be dried before the actual combustion process. It is provided as a particular
option for examining sewage sludge.
The pre-combustion adapter can be used together with the open combustion tube in
vertical operating mode (standard version).
The pre-combustion adapter can be used for drying frit containers with wet filter cakes
like those produced when using the batch method. The batch method is predominantly
used for the AOX determination from turbid samples, sludge and sediments (
→
"Sample preparation" on page 52).
