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Operation
GA10218_002_A7 - 9/2015 - © Oerlikon Leybold
35
3 Operation
3.1 Media Compatibility/Purge Gas
The PHOENIX L300i is a leak detector for helium and hydrogen. Only air and clean
gases must be used with the PHOENIX L300i.
The leak detector is not suitable for
- pumping liquids or gases containing dust
- pumping reactive or corrosive gases
As purge gas all gases can be used that
- does not contain helium
- are dry, clean and dust free
- generate no corrosion.
For venting or gas ballast a helium free gas at atmospheric pressure should be
used. Ambient air can be contaminated with helium due to spraying or charging, so
it is recommended to connect a hose to the vent- and fore vacuum port. The pres-
sure in this hose must not exceed 1050 mbar.
3.2 Start-Up
The PHOENIX L300i is switched on by pushing the mains switch (Please refer to
Chapter 2.4.1). After about 2 minutes the run-up procedure is finished; the unit is in
standby-mode and ready to measure.
When using the PHOENIX L300i MODUL an additional fore vacuum pump (dry or
wet version) has to be connected to the fore vacuum connection (DN25 KF) on the
side or the bottom.
Please connect the part to be tested to the inlet port and press START. The PHOE-
NIX L300i starts to evacuate the part. The evacuation time depends on the volume
of the test part. During evacuation the screen shows the inlet pressure online.
Once the pressure of 15 mbar (11 Torr or 1500 Pa) is reached the unit switches to
measurement mode. The corresponding leak rate is displayed. For further explana-
tions of the screen please refer to Chapter 3.2.5.
The displayed leak rate corresponds to the helium background concentration in the
part under test. Since the PHOENIX L300i continues to pump down the part this
background leak rate will further reduce. As soon as the leak rate is low enough in
respect to your requirements you may start spraying Helium or Hydrogen to search
for possible leaks.
When the measurement is finished please press STOP and hold the button a few
seconds to vent the part under test.
3.2.1 Display
The display is used to either show leak rates or program specific set-ups and get
information by means of the software menu (Please refer to Chapter 3.6.1). In addi-
tion messages and maintenance instructions are displayed on the screen (Please
refer to Chapter 5).
Purge gas/Gas ballast