VACUUBRAND VAP 5 - Manual (Page 12)

page 12 of 17
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.: 999039 / 16/12/2009
Adjustment under vacuum:
➨ ➨ ➨ ➨ ➨ Evacuate gauge head to a pressure < 5 x 10 -4 mbar. Status indication vacuum is displayed.
Note: Adjustment under vacuum with an actual pressure > 5 x 10 -4 mbar reduces the accuracy of the
measurement.
➨ ➨ ➨ ➨ ➨ Push key-button at the side of the housing with a pencil tip or a small screwdriver. Status indication
readjustment is displayed.
➨ ➨ ➨ ➨ ➨ Push key-button again in order to adjust pressure reading to 1 x 10 -3 mbar. Status indication readjust-
ment vanishes.
Note: If the warning triangle flashes three times, the gauge head is exposed to a pressure where
readjustment is not possible. Push key-button again to stop readjustment operation. Vent or evacuate
the vacuum system in order to adjust required pressure. If due to aging or contamination an old gauge
cannot be adjusted, replace gauge head.
Adjustment to a factory-set reference pressure:
Instead of adjustment under vacuum, adjustment to a factory-set reference pressure is possible.
The reference mark is only valid, if a new clean gauge head is used, otherwise readjustment may reduce
the accuracy of measurement. Proceed only if a pressure < 5 x 10
-4 mbar cannot be achieved, i. e. if a
suitable vacuum pump is not available.
Note: If due to aging or contamination an old gauge cannot be adjusted under vacuum, replace gauge head.
➨ ➨ ➨ ➨ ➨ Push key-button at the side of the housing with a pencil tip or a small screwdriver. Status indication
readjustment (”Set”) is displayed.
➨ ➨ ➨ ➨ ➨ Disconnect leads from housing connector. The warning triangle flashes.
➨ ➨ ➨ ➨ ➨ Push key-button again in order to adjust pressure reading to the factory-set reference mark as adjust-
ment under vacuum. Status indication readjustment vanishes.
➨ ➨ ➨ ➨ ➨ Insert leads into housing connector. The warning triangle vanishes.
Adjustment of the pressure transducer VSK 5
The device has been adjusted at the factory. In general there is no need for readjustment by the user
because of the excellent longtime stability.
Depending on operation 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
Note: To determine the exact actual pressure, use an accurate barometer or get accurate reading
from the weather service, e. g. next airport..... (take into account the difference in altitude between e. g.
airport and laboratory).
➨ ➨ ➨ ➨ ➨ Push key-button at the side of the housing by using a pencil tip or a small screwdriver. Status indication
readjustment (”Set”) and the actual pressure are displayed.
➨ ➨ ➨ ➨ ➨ With a second tip within two seconds or continuous pressing, a pressure range from 700 to 1060 mbar
is running. Use the key-button to adjust the display to actual atmospheric pressure (short tips in steps
of 1 mbar). When the key-button is released, the adjustment mode is terminated and the selected
pressure value is stored automatically.