7.2.4
Element Glaze
Depending on the use, heating elements may lose their glaze and gain a rough
appearance. They should be checked from time to time. If the glaze has disappeared, it
may be restored by heating the furnace up to 1500 °C, without load, for approximately
2 hours.
7.3
Calibration
After prolonged use, the controller and/or thermocouple may require recalibration. This
is important for processes that require accurate temperature readings or for those that
use the product close to its maximum temperature. A quick check using an independent
thermocouple and temperature indicator should be made from time to time to
determine whether full calibration is required. Carbolite Gero can supply these items.
Depending on the controller fitted, the controller instructions may contain calibration
instructions.
7.4
After-Sales Service
Carbolite Gero Service has a team of Service Engineers who can offer repair, calibration
and preventive maintenance of furnace and oven products both at the Carbolite Gero
factory and at customers’ premises throughout the world. A telephone call or email
often enables a fault to be diagnosed and the necessary parts to be despatched.
In all correspondence please quote the serial number and model type given on the
rating label of the product. The serial number and model type are also given on the
back of this manual when supplied with the product.
Carbolite Gero Service and Carbolite Gero contact information can be found on the back
page of this manual.
7.5
Recommended Spare Parts and Spare Parts Kit
Carbolite Gero can supply individual spare parts or a kit of the items most likely to be
required. Ordering a kit in advance can save time in the event of a breakdown.
Each kit consists of one thermocouple, one sheath, one power thyristor, one door
insulation piece and a set of elements, clips and braids, element clamps and insulators.
Individual spare parts are also available.
When ordering spare parts please quote the model details as requested above.
7.6
Power Adjustment (Controller)
The product's controller incorporates a power limit parameter OP.Hi, which is usually
inaccessible to the operator.
The correct setting for the power limit depends on the supply voltage, table given in
section11.0
49
7.0 Maintenance
