VACUUBRAND CVC 3000 E - Manual (Page 47)

page 47 of 75
The vacuum gauge was adjusted using factory standards,
which are traceable through regular calibration in an ac-
credited laboratory (DAkkS calibration laboratory) to the
German national pressure standard. Depending on the
process and/or accuracy requirements, check the adjust-
ment and readjust if necessary. For readjustment, the
device has to be adjusted both at atmospheric pressure
as well as under vacuum but only if the reference pres-
sures are known with certainty. The adjustment mode can
be activated only if the process control is inactive. Press
”START/STOP” key, if necessary. In the range between 15
to 525 Torr (20 to 700 mbar) no adjustment is possible;
---- Torr is displayed.
NOTICE
Readjustment
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 E 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).