BUCHI Wet Digester B-440 - Manual (Page 30)

7 Maintenance and repairs
30 B-440 Operation Manual, Version D
Push a fi xation clip to free one side of the heating element with one hand. At its ceramic insulation, s
carefully lift the heating element slightly (!) above the holder. The heating element must not collide
with the ceramic tube of the temperature sensor!
Repeat the previous action at the second holder to completely free the heating element. s
Carefully put the heating element out of the heating chamber. Mind the limitating cable length — s
do not pull with force! Do not touch the glass of the heating element!
Taking out the old refl ector
Squeeze the refl ector suffi ciently to pass the thin ceramic tube at the refl ectors cut-out when s
removing it. Carefully avoid knocking or braking the sensor tube! Dispose of the refl ector.
Take out the lower check plates. s
Wear acid-safe gloves to wipe out the chamber with wet damp cloth. s
Reinstall the lower check plates. s
Installing a new refl ector
Remove the protective foil of the new refl ector. Be careful not to leave fi ngerprints on the refl ective s
(inner) side!
Align the cut out at the front side of the refl ector to the temperature sensor tube. Keep the s
refl ector rear side upright and slightly (!) sqeeze it to just pass the temperature sensor tube with
the cut out. Do not overbend the refl ectors material! The hold-down cams must securely keep the
refl ector in position.
Reinstall the heating element. Take care with proper routing of the cables! s
Reinstall the upper check plates. s
Check proper seating of all parts before reconnecting the device to mains!
! WARNING
Risk of fi re and dangerous or moderate burns when touching overheated housing parts.
Always install upper and lower check plates at both sides of the heating chamber s
Use the handle to lift the glass hood s
Use a tongs to handle the crucibles s
Do not cover any part of the device during operation or when device it hot s
NOTICE
Risk of heating element damage by lubricants, sharp objects and fi ngerprints.
Do not put any lubricate on the heating element s
Do not let the heating element collide with other objects s
Do not touch the glass of the heating element, avoid fi ngerprints s
Wear protective gloves s