Despatch LEB Series - Manual (Page 29)

21
Oven Zone Calibration
The CONTROL instrument has been tested and calibrated at the factory. Under
normal operating conditions, recalibration should not be necessary. However, if
the user would like to recalibrate the CONTROL for a specific operating condition,
then recalibration is easily accomplished.
Set-Up Parameters
(Equipment needed: temperature measuring device with a Compatible
Temperature sensor)
1. Verify that the bS (PV Bias) programmed in the
CONTROL is 0. Refer to Instructions on viewing
the parameter in the PARAMETER
PROGRAMMING mode.
2. Locate the temperature sensor of the temperature
measuring device at the center of the chamber.
3. Operate the oven until it reaches the desired
operating temperature and the CONTROL is regulating. The user may wish
to have a loaded chamber with a standard amount of product to simulate a
specific operating condition. It will take several minutes for the unit to
stabilize at the controlled temperature. Allow at least 30 minutes of
operation at the stabilized temperature before proceeding.
4. Subtract the average controlled temperature (number appearing on the
CONTROL display) from the actual oven temperature (number appearing on
the temperature measuring device display). The CONTROL and the device
must be in the same scale (°C or °F).
Actual Oven Temperature - Controlled Temperature = calculated value
5. Enter the calculated value from Step 4 as the new bS (PV Bias) value in the
instrument.
WARNING: Make sure
you understand what
you are changing
before doing so.
Changing the program
parameters will alter the
functions of the
CONTROL.