Owner manual
3.4 Multi-mode electrode (MME)
746 VA Trace Analyzer / 747 VA Stand
3-21
5
Evacuating in vertical position
• Place multi-mode electrode 3838 vertically in the electrode holder 114114 (see
Fig. 15-1).
• Evacuate for ca. 2 min in this position.
6
Evacuating in inclined position
• Carefully tilt multi-mode electrode 3838 in the electrode holder 114114 to an
inclined position and continue evacuating (see Fig. 15-2).
7
Release vacuum
• As soon as mercury issues from the tip of the glass capillary 109109 into the
filling tubing 115115, carefully release the vacuum by opening the vacuum
release tap.
The filling tubing 115115 must not be disconnected from the glass capil-
lary 109109 when under vacuum, otherwise the mercury which has
issued from the capillary would be sprayed onto the tubing wall and
can no longer be disposed of in drop form!
• Tap the glass capillary 109109 gently by hand so that any mercury drops at
its tip are knocked into the filling tubing 115115.
• Disconnect filling tubing 115115 with filling cone 116116 from glass capillary
109109.
• Place multi-mode electrode 3838 in a horizontal position in the electrode
holder 114114 (see Fig. 15-3).
From now on, the MME must be left in this position until it is installed in
the stand!
8
Install multi-mode electrode in 747 VA Stand
• With measuring head arm 4040 tilted back, push empty measuring vessel
2828 into the holder 2626 of the 747 VA Stand and then lower measuring head
arm 4040.
• Carefully insert multi-mode electrode 3838 in opening 7676 of the measuring
head 4141 (during insertion, the tip of the capillary must not touch the
measuring head) and push in as far as it will go.
9
Connect multi-mode electrode
• Screw FEP tubing 5151 for the inert gas supply into connection 9393 of the
multi-mode electrode 3838.
• Screw FEP tubing 5959 for the inert gas supply into connection 9494 of the
multi-mode electrode 3838.
• Attach electrode cable 3737 (WE) to screw connection 110110 of the multi-
mode electrode 3838: push cable lug under the screw and then tighten
screw firmly.