6
Verifying and calibrating measuring system
5200-en_V2.0_06/20
77
Performing leakage test
1.
Select
Main menu > expert user menu
(password
1-
).
2.
Select the button
suction pump/signals/digital IO.
3.
Switch
off
the pump with the slider
suction pump
.
4.
Write down the value of the parameter
sensor flow rate
.
This is the
offset value.
5.
Detach the sampling head.
6.
Release the bracket holding the sampling tube.
7.
Slide the sampling tube up approx. 20 cm and secure it in this position.
ð
The aerosol inlet tube is now accessible.
8.
Seal the aerosol inlet tube with a plug.
9.
Switch
on
the pump with the slider
suction pump
.
ð
The pump evacuates the sampling system in the controller. The
pump output increases audibly.
10. When the value has stabilized at its minimum:
Write down the value of the parameter
sensor flow rate
.
This is the
gross leakage of the controller
.
11. Remove the plug from the aerosol inlet tube.
12. Calculate the net leakage value.
Leave the device in this state to check leakage in the entire system next. Re-
