BUCHI Vacuum Controller V-855 - Manual (Page 42)

6 Operation
42 V-850/855 Operation Manual, Version E
! CAUTION
Risk of minor or moderate injuries by hot surfaces when the instrument comes out of the labora-
tory oven.
• Always be aware of the burn hazard.
• Always wear personal protective equipment such as protective gloves when getting the instru-
ment out of the laboratory oven.
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 complete. 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 calibration at room temperature is finished, put the instrument into the laboratory oven
and heat it up to 55 °C (this will take approx. 1.5 h).
• Repeat the calibration steps described above.
• 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.
Recover calibration:
To delete the current calibration and restore the factory calibration, i.e. the delivery condition, select
Recover calibration. You are asked whether you want to recover the calibration or not. Press
Yes to
confirm or No to maintain the current calibration.
NOTE
Consider that “Recover calibration” deletes any existing calibration carried out by the customer.