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8.9
Element Installation and Replacement
See section 8.2 - wearing a face mask is required.
See section 8.3 - Safety Warning - molybdenum disilicide.
Molybdenum disilicide elements form a glazed surface when heated.
Internal stresses can form through heating and cooling which render the
glaze fragile. The glaze can sometimes splinter into a shower of sharp
particles when handled. Always wear eye protection when handling the
elements.
Handle the heating elements with extreme care as they are very fragile. Also, avoid
touching the heating surface (the thin part of the element), as the material is
susceptible to corrosive damage from skin contact.
Handle the heating elements with extreme care as they are VERY FRAGILE. Also, avoid
touching the heating surface (the thin part of the element).
Replacement: Note the length of element above the fixing clamps before starting.
Remove the aluminium braids and clips. Remove the clamp, which has a screw fixing.
Lift out the old element and insulation piece (element block): handle the insulation
piece with care as it is fragile.
Due to the different product sizes and voltage configurations, there is a number of
variations in the detailed element support layout. The element diagrams show the main
alternatives. Examine and identify the loose components and the support system
appropriate to the furnace. There are also variations in the positions of the braids which
connect the elements: the rule is that for single phase all elements are in series; for 3-
phase, each phase has 2 (or 3) elements in series.
Fit the insulation spacer or block to the element; if the element is suspended from strips
or bars above the chamber roof, also fit the element support block. Locate the clamp(s)
over the element and tighten carefully. Lower the element into position and connect the
braids using finger pressure or the clip tool provided.
Ensure that the element is correctly placed: the thin part of the element legs should be
entirely within the heating chamber; the element should not touch the bottom of the
chamber. A guide to the correct placement is given in the table below, using the
measurement from the top of the clamp to the top of the element.
Replacement: heat up the furnace to a moderate temperature and ensure that the
furnace is controlling properly, in case the previous element failure resulted from a fault
in the control system.
After installing new elements operate the furnace at 1500 °C for an hour. This creates a
protective glaze on the element surface.
55
8.0 Repairs and Replacements
Содержание CARBOLITE GERO 3508 Series
Страница 7: ...Caution Double Pole Neutral Fusing 7 1 0 Symbols and Warnings ...
Страница 37: ...Power Limit View 37 4 0 3508 Dual Loop Cascade ...
Страница 57: ...Element Connections Example 3 phase 57 8 0 Repairs and Replacements ...
Страница 63: ...Notes Service Record Engineer Name Date Record of Work ...