Inficon ULTRATEST UL3000 Fab, Translation Of The Original Operating Instructions

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4 | Description INFICON
16 / 140 UL3000-Fab-Operating-instructions-iina73en1-08-(1910)
4 Description
4.1 Function
The device is a leak detector for detecting and measuring leaks in test objects. The
device is suitable for leak detection using the vacuum method and the sniffer method.
It uses the ULTRATEST
TM
sensor technology.
• When using the vacuum method the test object is evacuated and subjected to
helium or forming gas from the outside. To do this it is necessary to establish a
vacuum connection between the device and the test object.
• When using the sniffer method an overpressure is established in the test object
using helium or a forming gas. The test object is then inspected on the outside
using a sniffer line.
4.2 Operation modes
4.2.1 Operation mode "Vacuum"
The inlet flange is located on the upper side of the device.
To be able to calibrate using the vacuum mode a suitable external calibration leak
must be mounted on inlet flange. See also "External calibration [ } 72]".
To be able to perform leak detection using the vacuum method the inlet flange must
be connected to the desired test object.
If the pressure in the specimen is less than the surrounding pressure, then helium
(which is sprayed over the specimen) can penetrate into the specimen if there is a
leak. Helium can be detected in the leak detector using a mass spectrometer.
HYDRO•S (only UL3000 Fab PLUS)
With the operation mode "Vacuum" there is the possibility to use, HYDRO•S.
HYDRO•S reduces the time to measuring mode when using large test objects.
The desorption of water vapor in a test chamber produces an unwanted background
signal. HYDRO•S separates and suppresses this signal from the helium signal, so that
the test can start earlier. A new calibration is required after a change to this mode. In
the mode HYDRO•S the lower detection limit is 1 x 10
-10
mbar l/s.
4.2.2 Operation mode "Sniffing"
To be able to inspect test objects under overpressure with a sniffer line you can
connect the sniffer SL200.