6
Verifying and calibrating measuring system
76
5200-en_V2.0_06/20
6.2
Checking that controller shows no leakage
Net leakage of controller
The
net leakage
is the difference in the parameter
sensor flow rate
when the pump is switched on with the aerosol tube closed (= “gross leak-
age”) and when the pump is switched off (= “offset”).
Net leakage =
gross leakage – offset
When the
net leakage
is less than
0.08 l/min
, the controller is considered to
be sealed.
If leakage is greater, check the following:
• Seat of gravimetric filter
• Seals on gravimetric filter
• Hose connection between gravimetric filter and controller
• Seat of blue pump filter
When checking, the aerosol tube has to briefly be sealed with a plug (or with
your thumb).
Prerequisites for testing controller leakage
• Calibration mode is activated.