Disconnect the thermocouple from its terminal block.
Bend the metal, or release the thermocouple sheath; withdraw the sheath and shake
out any fragments of thermocouple.
Re-assemble with a new thermocouple observing the colour coding. Ensure that the
thermocouple is not twisted as it is being inserted and that the metal tag is bent back,
or the screw inserted, to grip the sheath.
Refit the product's element access panel.
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.
53
8.0 Repairs and Replacements
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Страница 55: ...Element Connections 1 phase Element Connections 3 phase 55 8 0 Repairs and Replacements ...
Страница 58: ...10 0 Wiring Diagrams 10 0 Wiring Diagrams 10 1 239 4 5001 58 ...
Страница 61: ...Notes Service Record Engineer Name Date Record of Work ...