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E range
Fitting the extended work tube in an EVA/EVC/EVT/EVZ furnace
(Tools required: 4mm Hex key.)
The fitting of the work tube is as follows with reference to Figure 2-3, page 5, Figure 2-13, page 9,
Figure 2-15 and Figure 2-14 on page 10. Please note that extended work tubes are also referred to
as 'tubes suitable for working in a modified atmosphere or vacuum'. They are 450mm longer than
the heated length of the furnace (see Table 9-1 page 24). Read section 5.2 before fitting the work
tube.
Note it is easier to fit the work tube with the furnace in the horizontal position as shown in Figure
2-12 page 9.
For EVA/EVC models: before the extended work tube can be fitted, the work tube end stops
for the standard work tube (Item 7 in Figure 2-13, page 9) must be removed from the top
and bottom of the furnace. This is done by removing the end guard (8) and the work tube
adaptor brackets (4) to release the work tube end stop. The guards and brackets are then
refitted.
EST/EVS models: these only use extended work tubes; no work tube end stops are supplied.
Fit the extended work tube bracket Item 2 Figure 2-15, page 10. Note that on the
EVA/EST150 and EVA/EST300 models the fixing holes are in the furnace mounting
cradle (10). The fixings required (11 and 12) also hold the furnace onto the cradle. Remove
these fixing screws and reaffix with support bracket (2) in place. Fit one bracket at a time
so that the furnace is always held in place by the other end.
On the EVA/EVC/EVT/EVZ450 and EVA/EVC/EVT/EVZ600 models the fixing holes are
in the end of the terminal cover, use the M6 washers (11) and M6x16 dome cap screws
(12) supplied
For EVA/EVC models; with the furnace in the horizontal position, slide the extended work
tube into the furnace through the work tube adaptor (3) Figure 2-13, page 9. Note that the
work tube might be a tight fit when it is new and may need to be twisted backwards and
forwards slightly as it slides in. For long work tubes it may be necessary to use a long
wooden pole such as a broom handle to support and line up the work tube as it is pushed
through. It may also take 2 people to perform this operation. Position the work tube so that
an equal amount of work tube extends from either end of the furnace.
For EST/EVS models; with the furnace in the horizontal position lift the lid by the handle
Figure 2-3 (1) and position the work tube in the bottom half of the furnace on the work
tube adaptors Figure 2-3 (3).
Figure 2-15. Exploded view of the parts in the supports for
the extended work tube.
10
Figure 2-14. Cutaway assembled view of the supports for the extend work
tube and their position.
MF65-1.01
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