Owner manual
3 Installation
746 VA Trace Analyzer / 747 VA Stand
3-26
6
Replace sealing needle 9797 if need be
If problems with leaks arise owing to a worn, deformed or damaged sealing
needle 9797 (see sections 7.4.2 and 7.4.3), this must be replaced. Three spare
needles are supplied separately in a protective plastic package. After un-
packing a needle, please avoid any contact whatsoever with the needle tip.
The spare needle 9797 is installed as follows:
• Carefully pull old sealing needle 9797 out of PTFE membrane of the slotted
screw 9696.
• Carefully insert new sealing needle 9797 without tilting into the hole in the
PTFE membrane of the slotted screw 9696.
When the sealing needle 9797 is changed, it is always necessary to
change the glass capillary 109109 !
7
Replace sealing ring 106106 if need be
• If the sealing ring 106106 is contaminated or damaged in any way (see
sections 7.4.2 and 7.4.3), it must be replaced for the subsequent assem-
bly of the MME. Two new sealing rings 106106 are enclosed in the package
with the 6.1226.030 glass capillaries.
8
Reassemble MME
• Screw slotted screw 101101 using a suitable coin flush into screw thread
100100.
Do not turn so tightly that the cemented-in steel threaded ring 100100
becomes loose and hence jeopardizes the tightness and safety of the
MME!
• Using a suitable coin, screw slotted screw 9696 into the screw thread 9898
until the contact surface of the black O-ring at the Plexiglas wall (thin,
black stripe) is just visible below the metal thread 9898.
• Place multi-mode electrode 3838 with the opening 104104 facing upwards in
the electrode holder 114114 (see Fig. 15-1).
• Insert insert ring 105105 in opening 104104.
• Push sealing ring 106106 onto locking ring 107107 and insert both in the open-
ing 104104.
• Screw retaining nut 108108 by hand into screw thread 104104 until a slight
resistance is felt.
9
Add mercury
Proceed as described in section 3.4.2.
10
Mount new capillary
Proceed as described in section 3.4.3.
11
Fill capillary
Proceed as described in section 3.4.4 or section 3.4.5.