Carbolite 301 - Manual (Page 15)

Customer Calibration
15 MC16-GB-C – 1.04
7 Maximum Output Setting
Depending on the furnace or oven model the maximum output power setting
OPHi may be
accessible or hidden.
For silicon carbide heated furnaces the parameter is accessible to allow compensation for
element ageing, refer to the product manual for details.
In many models the maximum output power setting depends on the supply voltage, refer to
the product manual for details.
8 Customer Calibration
The controller is calibrated for life at manufacture, there may however be sensor or other
system errors which affect the accuracy of the measured temperature. Customer calibration
is used to compensate for these errors. This function is disabled when the timer is running.
The 301 controller has three types of customer calibration: factory calibration, single point
calibration and dual point calibration. See section 3.5 & 3.6 to access these.
8.1 Factory Calibration -
FAct
Factory calibration is the default setting, which has no offset adjustment. It simply displays
the temperature measured by the control thermocouple.
8.2 Single Point Calibration -
C.CL1
Single point calibration uses an offset value to adjust the temperature over its whole range.
Single point calibration accurately sets the temperature for setpoint values close to the
temperature at which the calibration offset is made. This accuracy is reduced for setpoint
temperatures which are significantly higher or lower than this.
Table showing examples of how to determine offset values
The calibration temperature may be measured at the centre of the chamber or through a
specially fitted port.
New Offset Value = Old Offset Value + New Offset adjustment
New Offset Adjustment = Measured Calibration Temperature
– Displayed
Temperature
Caution! - The procedure to determine the calibration temperature at the centre of a
chamber is not covered in these instructions. If you are unsure how to do this safely, then
seek advice as there is a risk of electric shock if done incorrectly.
Measured
Calibration
temp (°C)
Displayed
temp (°C)
Old Offset
Value (°C)
New Offset
Adjustment
New
Offset
Value (°C)
252 250 0 2 2
248 250 0 -2 -2
252 250 2 2 4