6
Verifying and calibrating measuring system
78
5200-en_V2.0_06/20
6.3
Checking device for leakage
Net leakage of total system
The
net leakage
is the difference in the parameter
sensor flow rate
when the pumps are switched with the IADS tube closed (= “gross leakage”)
and when the pumps are switched off (= “offset”).
Net leakage =
gross leakage – offset
When the
net leakage
is less than
0.5 l/min
, the entire device is considered
to be sealed.
If leakage is greater, check the following:
• Seat of IADS tube in aerosol inlet
• Seals on aerosol inlet
When checking, the IADS tube has to briefly be sealed with a plug.
Prerequisites for testing device leakage
• Calibration mode is activated.
• The controller has been tested for leakage and verified.
• The screen
Main menu > expert user menu
is visible.
