MANUALP/4000_SERVICE_0712 July2012
17
SECTION 5 CALIBRATION
It is important to note that the calibration of this enclosure is valid only when it is
calibrated in its final operating environment. Contherm calibrates the enclosure
to our internal standards in the final testing stages of manufacture. This means
that when the enclosure arrives at the customer site, the calibration carried out
in the factory may no longer be valid. Contherm wishes to make it clear that
calibration is a CUSTOMER responsibility. Contherm has ensured that a
complete acceptable calibration procedure is available for the customer to
follow.
Calibration of the enclosures is achieved by checking the enclosure temperature
display against a customer supplied calibrated thermometer and CO
2
monitoring device. It is important that the calibration is carried out at the
temperature of interest.
The temperature sensor that is used by the electronic thermal control system is
also used to indicate the control temperature. This sensor is in the duct of the
air circulation system and is not directly in the work space, therefore it is
necessary to adjust any offset between the work space and the indicated
temperature. Calibration entails adjusting the CALIBRATION FACTOR so that
the work space temperature matches the indicated temperature. The
CALIBRATION FACTORS are stored in an Electrically Erasable Read Only
Memory (EEROM). EEROM retains its stored memory even with the power off.
TEMPERATURE CALIBRATION
1 Place a calibrated reference thermometer that has been checked to the
customers satisfaction into the enclosure. The usual place for this is in
the centre of the work space. Place it so that it is able to be read without
opening the glass inner door.
2 Ensure the enclosure has stabilised at the temperature of interest for at
least 6 hours.
3 Press and hold the TEMP button until the display momentarily blanks,
this will access the SET POINT mode and the SET LED above the
temperature display will be on.
4 Press both TEMP and CO
2
buttons at the same time. The temperature
display will show [Cal] for 2-3 seconds and then show the current
temperature.
5 Adjust the value displayed to read the same as your reference
thermometer.
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