3 Installation
757 VA Computrace – Hardware
28
5 Evacuating in vertical position
•
Place multi-mode electrode
17
vertically in the electrode holder
93
(see
Fig. 11-1
).
•
Evacuate for ca. 2 min in this position.
6 Evacuating in inclined position
•
Carefully tilt multi-mode electrode
17
in the electrode holder
93
to an
inclined position and continue evacuating (see
Fig. 11-2
).
7 Release vacuum
•
As soon as mercury issues from the tip of the glass capillary
88
into the
filling tubing
94
, carefully release the vacuum by opening the vacuum re-
lease tap.
The filling tubing
94
must not be disconnected from the glass capillary
88
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
88
gently by hand so that any mercury drops at its
tip are knocked into the filling tubing
94
.
•
Disconnect filling tubing
94
with filling cone
95
from glass capillary
88
.
•
Place multi-mode electrode
17
in a horizontal position in the electrode
holder
93
(see
Fig. 11-3
).
From now on, the MME must be left in this position until it is installed in
the stand!
8 Install multi-mode electrode in 757 VA Computrace Stand
•
With measuring head arm
19
tilted back, push empty measuring vessel
6
into the holder
3
of the 757 VA Computrace Stand and then lower meas-
uring head arm
19
.
•
Carefully insert multi-mode electrode
17
in opening
55
of the measuring
head
20
(during insertion, the tip of the capillary
88
must not touch the
measuring head) and push in as far as it will go.
9 Connect multi-mode electrode
•
Screw FEP tubing
30
for the inert gas supply into connection
72
of the
multi-mode electrode
17
.
•
Screw FEP tubing
38
for the inert gas supply into connection
73
of the
multi-mode electrode
17
.
•
Attach electrode cable
16
(WE) to screw connection
89
of the multi-mode
electrode
17
: push cable lug under the screw and then tighten screw
firmly.
