Palas Fidas 200 Series Operating Manual page 77

5200-en_V2.0_06/20
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-
fer to the section "Checking device for leakage [} 78]."
6 Verifying and calibrating measuring system
77