Linxon LX218 - Connecting an External Backing Pump

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6.
In case you would like to suppress any possible existing background signals
(helium background in the test object) press the ZERObutton.
In order to reverse the background suppression press the ZERO button on the
control panel for 2 - 3 seconds, see "Control unit [}17]”.
7.
Press the STOPbutton.
ð The device switches to the "Standby" mode.
If you press the STOP button on the control panel for a few seconds the inlet
of the device is ventilated.
8.
If you want to end the test now you can switch off the device.
9.
If you want to check the internal calibration wait, for getting a better quality of
measurement results, 15 to 20 minutes until the device has warmed up.
10
.
In order to call up the calibration menu, press "CAL".
Standby > Configuration > Global settings > Access control > Access to the CAL
function
1.
Press the button.
ð The automatic internal calibration starts and requires approx. 30 seconds.
2.
If you want to check the measurement accuracy of the device using the optional
helium calibration leak remove the blank flange from the inlet and connect an
open helium calibration leak onto the inlet.
3.
Press the Startbutton.
ð The inlet is evacuated and the leak rate of the test object is measured and
displayed.
4.
Press the STOPbutton to interrupt the measurement.
ð The leak detector changes into the "Standby" mode.
5.
Press the STOP button on the housing until the message STANDBY/VENTED
appears on the display.
ð The inlet is now in the vented state.
6.
Separate the helium calibration leak from the inlet and flange the inlet blind
again.
7.
Switch off the device via the power supply switch.
5.4 Connecting an external backing pump
Final pressure p 0.1 mbar
Pumping speed < 6 m³/h
Table6: Specifications for the external backing pump