VACUUBRAND DVR 4S - Manual (Page 13)

page 13 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 under vacuum
Evacuate the vacuum gauge to a pressure <0.5 mbar (<0.4 Torr).
Press key UP/DOWN simultaneously with key ON/
OFF.
☞ The vacuum gauge switches to the adjustment
mode (indicated by a warning triangle).
☞ The reading is adjusted automatically to ”zero”.
Attention: Adjustment under vacuum with a pres-
sure higher than 0.5 mbar (0.4 Torr) reduces the
accuracy of measurement. If the pressure is sig-
nificantly higher than 0.5 mbar (0.4 Torr), adjust-
ment to a reference pressure is recommended (see
next paragraph).
Press key ON/OFF to confirm adjustment and to
terminate mode.
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Readjustment of the vacuum gauge
The equipment has been adjusted at the factory. In general due to the excellent longtime stability, there is
no need for readjustment by the user on receiving.
Depending on operating conditions, type of application and accuracy requirements, an inspection and
readjustment may become necessary.
Adjustment at atmospheric pressure
Admit air to the vacuum gauge. Make sure that the vacuum connection at the vacuum gauge is at atmospheric
pressure.
Attention: Determine the exact actual atmospheric pressure, e. g. by using an accurate barometer or get
accurate reading from the weather service, e. g. at the next airport, etc. (take into account the difference in
altitude between e. g. airport and laboratory).
Press key ON/OFF to confirm adjustment and to
terminate mode.
Press key UP/DOWN simultaneously with key ON/
OFF.
☞ The vacuum gauge switches to the adjustment
mode (indicated by a warning triangle).
☞ The arrow in the right direction indicates that
the pressure value can be increased by using
key UP/DOWN.
Press key UP/DOWN to increase the reading to
actual atmospheric pressure.
To reduce the reading:
Press key MODE to change arrow direction to the
left.
Then press key UP/DOWN to reduce the reading.
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