VACUUBRAND PC 301 - Manual (Page 25)

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.: 999147 / 17/06/2014
page 25 of 40
Evacuate the vacuum gauge to an exactly known reference pressure within the range of 0 .... 20 mbar
(0 .... 15 Torr). Switch the 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 ac-
curacy 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 reading
from ”0” (”zero”) to the actual reference pres-
sure in the vacuum line in the range of 0 to 20
mbar (0 to 15 Torr).
➨ Press key ON/OFF to confirm the adjustment
and to terminate the adjustment mode.
Adjustment to a reference pressure
Calibration in the factory
➨ Unscrew the fuse holder at the rear of the pump using a
slotted screw driver.
➨ Replace the defective fuse by a fuse of the same type (see
„Technical data“) and reassemble fuse holder with fuse to
the pump.
Replacing the motor fuse (only MD 1C C/US)
Control of measuring equipment
The VACUUBRAND DAkkS calibration laboratory is accredited by the Deutsche Akkreditierungsstelle
GmbH (national accreditation body of the Federal Republic of Germany) for the measurable variable
pressure in the pressure range from 7.5*10 -4 Torr to 975 Torr (10 -3 mbar to 1300 mbar) in accordance with
the general criteria for the operation of testing laboratories defined in the DIN EN ISO/IEC 17025:2000
series of standards (accreditation number D-K-15154-01).
The DAkkS is signatory to the multilateral agreements of the European cooperation for Accreditation
(EA) and of the International Laboratory Accreditation Cooperation (ILAC) for the mutual recognition of
calibration certificates.
Rely on calibration in the VACUUBRAND calibration laboratory:
- to meet the requirements of the DIN ISO 9000ff and 10012 series of standards regarding the calibra-
tion of inspection, measuring and test equipment at specified intervals.
- to document that the vacuum gauges calibrated are traceable to national standards of the PTB
(Physikalisch-Technische Bundesanstalt; German national institute for science and technology and
the highest technical authority of the Federal Republic of Germany for the field of metrology and
certain sectors of safety engineering).
DAkkS calibration DVR 2 ............................................................................................................900217
➨
Switch off the pump.
➨ Disconnect the electrical power cord before unscrewing the fuse holder.
☞ Identify and eliminate the cause of failure before switching on the pump again.