VACUUBRAND DVR 4S - Manual (Page 14)

page 14 of 20
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check
carefully the validity of this document with respect to his product. manual-no.: 99 90 72 / 13/08/2005
Adjustment at reference vacuum
Evacuate the vacuum gauge to an exactly known reference pressure within the range of 0 .... 20 mbar (0 ....
15 Torr).
Switch vacuum gauge to the adjustment mode (see ”Adjustment under vacuum”).
Attention: The accuracy of the value of the reference pressure will directly affect the accuracy of the
adjustment. If the nominal ultimate vacuum of a diaphragm pump is used as ”reference” vacuum, the
accuracy of the adjustment of the vacuum gauge might be doubtful. The diaphragm pump may not achieve
the specified value ( due to condensate, poor state, failure of the valves or the diaphragm.
Press key UP/DOWN to adjust the display from
”0” (”zero”) to the actual reference pressure at the
vacuum gauge in the range of 0 to 20 mbar (0 to
15 Torr).
Press key ON/OFF to confirm adjustment and to
terminate mode.
Calibration in the factory
Control of measuring equipment
The VACUUBRAND DKD calibration laboratory is accredited by the Physikalisch-Technische Bundesanstalt
(PTB; German National Institute for Science and Technology and the highest technical authority of the
Federal Republic of Germany for the field of meteorology and certain sectors of safety engineering) for the
measurable variable pressure in the range from 10
-3 mbar to 1000 mbar in accordance with the general
criteria for the operation of testing laboratories defined in the standard EN ISO/IEC 17025:2000.
Calibration in the VACUUBRAND calibration laboratory is recommended:
-
To meet the requirements of the DIN ISO 9000ff and 10012 series of standards regarding the calibration
of inspection, measuring and test equipment at specified intervals.
- To document that the vacuum gauges calibrated are traceable to the national standard of the PTB.