Readjustment of vnc 2, Notice – VACUUBRAND PC 600 LAN NT User Manual
Page 58
page 58 of 102
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 de-
vice has to be adjusted both at atmospheric pressure as
well as under vacuum but only if the reference pressures
are known with certainty. The adjustment mode can be ac-
tivated only if the process control is inactive. Press ”Esc”
key, if necessary. If no adjustment is possible in the actual
pressure range:
”not possible” is displayed.
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 VNC
2 and/or the vacuum system. Make sure that
the pressure transducer is at atmospheric
pressure.
➨
In ”Device menu”, select program ”Cal.Sens” at the controller.
➨
Use the ▲ and ▼ keys to adjust the reading to the current atmospher-
ic pressure.
➨
Press the ”Enter” key to confirm.
1013 mbar
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).
Readjustment of VNC 2
NOTICE