BUCHI Interface I-100 - Manual (Page 28)

6 | Operation BÜCHI Labortechnik AG
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6.3.3 Complete calibration (with temperature compensation)
This calibration method is used to adjust the linearity of the pressure sensor at specific
predefined pressure levels and temperatures. During the calibration sequence the
pressure sensor is calibrated at room temperature and at a temperature of approx. 55­
°C in six stages at normal atmospheric pressure and at 800, 600, 400, 200 and 10­
mbar.
NOTE
This calibration process may only be carried out by authorized service technicians.
During the calibration sequence, the system carries out a plausibility check on the
measured readings and indicates a fault if the confirmed readings are implausible.
u Connect the reference pressure gauge to the same vacuum system that the pump
and interface unit are connected to.
u On the calibration menu, select the option Complete pressure calibration.
Fig. 19: Menu > Pressure sensor calibration > Complete pressure calibration.
u Using the arrow buttons, adjust the specified reference pressure to the figure
shown on the reference pressure gauge and press OK to confirm.
u Press the Next button.
u Using the P↑ and P↓ buttons, increase/decrease the vacuum in the system until the
pressure shown on the reference gauge is within ±10 mbar of the specified setting.
u Repeat the last three steps for each of the pressure levels listed above.
u When the six pressure levels have been calibrated at room temperature, place the
interface unit in a laboratory kiln and heat it up to 55 °C (approx. 1.5 hours).
u CAUTION! Risk of skin burns. Wear protective gloves. Leave the interface unit
in the kiln and repeat the steps set out above.
u On completion of the last step, press OK to confirm the calibration.
The calibration settings are saved and the display reverts to the default screen.