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Leak tests

Leak tests. G. Apeldoorn, P. Vankov 29.01.2004, NIKHEF. Leak tests 29.01.2004. Tests are based on using: AFS 1400 – Bidirectional Mass Flow Meter. (http://www.sensirion.com).

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Leak tests

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  1. Leak tests G. Apeldoorn, P. Vankov 29.01.2004, NIKHEF

  2. Leak tests 29.01.2004 Tests are based on using: AFS 1400 – Bidirectional Mass Flow Meter (http://www.sensirion.com) • Characteristics of AFS 1400: • - dynamic range: 0.03 – 400 sccm • Fast response time: 150 ms • Calibrated & Temperature compensated (for air & Nitrogen) • Digital output signal (RS-232)

  3. Leak tests 29.01.2004 opened Flow meter F1: 1.023e-6 l/s F2: -1.621e-7 l/s F3: -1.391e-7 l/s F4: 1.057e-7 l/s

  4. Leak tests 29.01.2004 shorted Flow meter F1: 1.014e-6 l/s F2: -1.441e-7 l/s F3: -1.244e-7 l/s F4: 8.529e-8 l/s

  5. Leak tests 29.01.2004 Temperatures Flow meter Flow meter

  6. Leak tests 29.01.2004 Connection in series “Brooks” mass flow controller

  7. Leak tests 29.01.2004 Leak test of Module 5012 (5m prototype) Leakage criterion: Leakage flow must be of the order (or less) of 1e-6 l/s. • Steps: • 0. Tap 2 is always closed. • Tap 1 is opened, gas is pumping the module in. • Tap 1 is closed, module is under 8 mbar overpressure, F1 is measuring. (N) Module 1 2 closed F1 Bubbler (8 mbar) Flow meter

  8. Leak tests 29.01.2004

  9. Leak tests 29.01.2004 Gas volumes (straw/outer) separation straw straw outer outer Module Gas straw straw F1 F2 outer outer Flow meter Flow meter

  10. Leak tests 29.01.2004 Gas volumes (straw/outer) separation straw straw outer outer Module Gas straw straw F1 F2 outer outer Flow meter Flow meter

  11. Leak tests 29.01.2004 How to proceed ? • Better tubes & taps • Atmospheric pressure & temperature monitoring • Flow controller • Nitrogen/Argon

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