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3 Installation
860 KF Thermoprep
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3.5 Mounting the needles
The length of the needle holder defines how deeply the injection needle
penetrates the sample vessel. The 6.2049.040 needle holder, which is
58 mm in length, ensures that the needle penetrates the liquid or pow-
dery sample. The carrier gas can flow through the sample and effect an
efficient expulsion of the moisture it contains.
If there is a danger that the heated sample could clog the needle, then
use the 6.2049.050 needle holder with 73 mm length. In this case the
injection needle penetrates the sample vessel only slightly deeper than the
outlet needle and has no contact with the sample itself. The 6.2049.050
needle holder can be ordered from Metrohm if required.
Needle holders with the dimensions required for situations calling for spe-
cial sample vessels can be supplied by Metrohm upon request.
Figure 10 Mounting the needles
Mount the needles as follows
1
Screw the 6.2049.040 needle holder into the distributor on the
guide head.
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