VACUUBRAND CVC 3000 - Manual (Page 53)

page 53 of 80
Adjustment at atmospheric pressure
An adjustment at atmospheric pressure is only
possible if the pressure is higher than 525 Torr
(700 mbar).
➨
Vent the measurement connection of the CVC 3000 or in case that of
a connected optional external gauge head VSK 3000. Make sure that
the pressure transducer is at atmospheric pressure.
➨
In ”Configuration” menu, select program ”Adjustment” at the controller.
➨
Use the selection knob to adjust the reading to the current atmospheric
pressure.
➨
Press the selection knob to confirm.
760 Torr
Note: To determine the actual atmospheric pressure, use an accurate
barometer or get accurate reading from the weather service, or a nearby
airport or other reliable source (taking into account the difference in alti-
tude between the source and the laboratory).
Adjustment under vacuum
An adjustment under vacuum is only possible
if the pressure is lower than 15 Torr (20 mbar)
absolute.
➨
Evacuate the measurement connection of the CVC 3000 or in case
that of a connected optional external gauge head VSK 3000 to a pres-
sure < 0.1 Torr (mbar) (e.g., by applying a good two-stage rotary vane
pump).
➨
In ”Configuration” menu, select program ”Adjustment” at the controller.
+
The reading is automatically adjusted to ”zero”.
➨
Press the selection knob to confirm.
0 Torr
Note: Adjustment under vacuum with an actual pressure higher than 0.1
Torr (mbar) reduces the accuracy of the measurement. If the pressure is
significantly higher than 0.1 Torr (mbar), adjustment to a reference pres-
sure is recommended.