6 Operation
41
V-850 / V-855 Operation Manual, Version E
6 .8 .2
Simple calibration (without temperature compensation)
NOTE
This calibration should only be carried out by authorized service personnel.
The calibration at room temperature serves to adjust the linearity of the pressure sensor at certain
predetermined pressure levels.
This is a 6 step calibration at room temperature, the pressure sensor is calibrated at atmospheric
pressure, 800, 600, 400, 200, and 10 mbar.
NOTE
During the calibration procedure the system carries out a plausibility check on the measured values
and displays an error message when the confirmed values are implausible.
To carry out the calibration, proceed as follows:
• Connect a reference pressure measuring device to the vacuum system your pump and controller
are part of.
• Select Calibr. pressure simple. The following screen appears:
• Use the selection knob on the vacuum controller to adjust the reference pressure value to the one
indicated on the display of the reference measuring device. Turn the knob to the right to increase
the value or to the left to decrease the value.
• Press OK to confirm the value (OK will only appear once you turn the knob).
• Press Next, use the buttons P
↑
and P
↓
to increase or decrease the vacuum in the system until the
displayed value (reference device) is within 10 mbar of the set value.
• Repeat steps 1-3 until step 6 etc.
• When the last step is finished, you are asked whether you want to save the calibration.
• Press OK to confirm. The calibration is saved and you get back to the main screen.
6 .8 .3
Complete calibration with temperature compensation
NOTE
This calibration should only be carried out by authorized service personnel.
The manual calibration serves to adjust the linearity of the pressure sensor at certain predetermined
pressure levels.
During the manual calibration, the pressure sensor is calibrated at atmospheric pressure, 800, 600,
400, 200, 10 mbar in 6 steps at room temperature and at a temperature of about 55 °C.
