Carbolite TZF Series - Manual (Page 10)

1700-1800° Tube
10
MF32 - 3.25
The maximum element currents for the various models are listed in section 8.2. Please contact
Carbolite for further information.
4.7 Work Tube Supports
Occasionally the internal work tube supports may need adjusting. See section 0.
5.0 R EPAIRS & R EPLACEMENTS
5.1 Safety Warning – Disconnection from Supply
Insulation made from High Temperature Insulation Wool
Refractory Ceramic Fibre, (better described as Alumino Silicate Wool)
(ASW)
This product contains alumino silicate wool products in its thermal insulation. These materials
may be in the form of blanket or felt, formed board or shapes, mineral wool slab or loose fill wool.
Whilst there is no evidence of any long term health hazards, we strongly recommend that safety
precautions are taken whenever the materials are handled.
Exposure to fibrous dust may cause respiratory disease.
When handling the material always use an approved respiratory protection equipment
(RPE-i.e. FFP3), eye protection, gloves and long sleeved clothing.
Avoid breaking up waste material. Dispose of waste in sealed containers.
After handling rinse exposed skin with water before washing gently with soap (not
detergent). Wash work clothing separately.
Before commencing any major repairs we recommend reference to the European Association
representing the High Temperature Insulation Wool industry (www.ecfia.eu)
We can provide further information on request. Alternatively our service division can quote for
any repairs to be carried out at your premises or ours.
5.2 Temperature Controller Replacement
2132, 3216, 3508 etc. Ease apart the two lugs at the side; grip the instrument and withdraw it from
its sleeve; push in the replacement.
5.3 Fuse Replacement
Access to internal fuses is by removal of the furnace cover or back panel. See section 8.1 for
details of fuses fitted.
5.4 Thermocouple Replacement
Disconnect the furnace from the supply, and remove the top cover.
Make a note of the thermocouple connections. The negative leg of the thermocouple is marked
blue. The “compensating” cable for 1700 & 1800°C thermocouples is plain copper.
Disconnect the thermocouple from its terminal block.
For the 1700°C furnaces: Bend the metal tag, or release the screw, to release the thermocouple
sheath; withdraw the sheath, and shake out any fragments of thermocouple.
For the 1800°C furnaces: remove the bracket that holds both thermocouple and sheath from the
top frame. Release the screw that hold the thermocouple and remove the thermocouple. Shake out
any fragments of thermocouple from the sheath.
Re-assemble with a new thermocouple observing the colour coding, ensuring 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.