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E range
Fitting the extended work tube in an EHA/EHC/EST/EZS furnace
(Tools required: 4mm Hex key.)
The fitting of the work tube is as follows with reference to Figure 2-2 on page 4,
page 5, Figure 2-5 and Figure 2-6 on page 6. 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.
Before the extended work tube can be fitted, the work tube end stops for the standard work
tube (item 5 in Figure 2-2, page 4 and Figure 2-3, page 5) must be removed from both ends
of the furnace. This is done by removing the furnace end guard (8) and the work tube
adaptor brackets (4) to release the work tube end stop. The guards and brackets should
then be refitted..
Fit the extended work tube bracket Item 2 Figure 2-5, page 6. Note that on the EHA/EST150
and EHA/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 EHA/EHC/EST/EVS450 and
EHA/EHC/EST/EVS600 models the fixing holes are in the end on the terminal cover. Use
the M6 washers (11) and M6x16 dome cap screws (12) supplied.
For EHA/EHC models slide the extended work tube into the furnace through the work tube
adaptor Figure 2-2 (3). 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 work tube extends from either end of the
furnace.
For EST/EVS models lift the lid by the handle (1) and position the work tube in the bottom
half of the furnace on the work tube adaptors Figure 2-3 (3).
For EHA/EHC/EST/EVS models, loosely fit the work tube support boss Figure 2-5 (5), "O"
ring (6), clamp ring (7), clamp (8), extended work tube slide bracket (3) and adaptor plate
(4) onto the work tube in the position shown in Figure 2-6 (approx. 77 to 79mm from the
work tube end). Note that the clamp is on the outside of the bracket and that the gap of
approximately7 to 9mm on the inside of the bracket is to allow the work tube to expand at
high temperatures.
Tighten the compression clamp (8) then adjust the position of the slide bracket (3) until it is
begins to support the weight of the work tube. Tighten the screw knobs (9) to hold in place
and check the work tube ends are still supported, if not then readjust.
Note that the position of work tube supports should be checked each time before the
furnace is used.
Figure 2-5. Exploded view showing how to fit extended
work tube and supports on a EHA.
6
Figure 2-6. Cutaway assembled view showing the
position of the support boss on the work tube.
MF65-1.01
on
Figure 2-3
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