VACUUBRAND DVR 3 - Manual (Page 12)

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: 999072 / 12/01/2011
page 12 of 18
Readjustment of the vacuum gauge
➨ Press key ”UP/DOWN” and keep it pressed
while switching on.
☞ The vacuum gauge switches into the adjust-
ment mode (indicated by a warning triangle).
☞ The arrow at the right indicates, that the pres- The arrow at the right indicates, that the pres-
sure reading can be increased using key ”UP/
DOWN”.
➨ Press key ”UP/DOWN” to increase the read-
ing to the actual atmospheric pressure.
The equipment has been adjusted at the factory. In general, there is no need for adjustment by the user
due to the excellent longtime stability.
Depending on operation conditions, type of application and accuracy requirements, an inspection and
readjustment may become necessary.
Admit air to the vacuum gauge. Make sure that the vacuum connection at the vacuum gauge is at at-
mospheric 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 differ-
ence in altitude between e. g. airport and laboratory).
To reduce the reading:
➨
Press key ”MODE” to change the direction
of adjustment. The arrow moves to the left
indicating that the pressure reading can be
reduced.
➨ Press key ”UP/DOWN” to reduce the read- Press key ”UP/DOWN” to reduce the read-
ing.
Evacuate the vacuum gauge to a pressure <0.5 mbar (<0.4 Torr) e. g. by applying a good rotary vane
pump.
➨ Press key ”UP/DOWN” and keep it pressed
while switching on.
☞ The vacuum gauge switches into the adjust-
ment mode (indicated by a warning triangle).
☞ The reading is adjusted automatically to
”zero”.
Attention: Adjustment under vacuum with a pressure higher than 0.5 mbar (0.4 Torr) reduces the ac-
curacy of measurement. If the pressure is significantly higher than 0.5 mbar (0.4 Torr), adjustment to a
reference pressure is recommended .
➨ Press key ”ON/OFF” to confirm the adjust-
ment and to terminate the adjustment mode.
Adjustment at atmospheric pressure
+
➨ Press key ”ON/OFF” to confirm the adjust-
ment and to terminate the adjustment mode.
Adjustment under vacuum
+