Velleman К8067 - Manual (Page 13)

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Connect the sensor to the interface board and apply power to the sensor board. Leave it idle for at least 15
minutes, to allow it to adapt to ambient temperature and put a reliable thermometer next to the sensor.
Run your software or the test software.
Adjust 'T adj' on the K8067 board until the displayed temperature corresponds with the thermometer indica-
tion.
If you cannot run the software at the time of calibration, follow these steps:
Connect a 500 ohm resistor (2 x 1K in parallel) between GND and OUT.
Apply power to the board (15VDC).
Leave it idle for at least 15 minutes, to allow it to adapt to the ambient temperature and put a reliable ther-
mometer next to the sensor.
Read the temperature. Divide the readout by 100 (e.g. 25.6°C = 0.256)
Add 0.23 (0.256 + 0.23 = 0.486).
Multiply the result by 10 (0.486 x 10 = 4.86).
Measure the voltage over the 500 ohm resistor with a voltmeter.
Adjust trimmer 'T adj' until you measure the calculated voltage (e.g. 4.86V).
14. Calibration
Calibration