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

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Presentation transcript:

Leak tests G. Apeldoorn, P. Vankov , NIKHEF

Leak tests Tests are based on using: AFS 1400 – Bidirectional Mass Flow Meter 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) (

Leak tests Flow meter opened F1: 1.023e-6 l/s F2: e-7 l/s F3: e-7 l/s F4: 1.057e-7 l/s

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

Leak tests Flow meter Flow meter Temperatures

Leak tests Connection in series “Brooks” mass flow controller

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

Leak tests

Flow meter F1 Module F2 Flow meter straw outer Gas Gas volumes (straw/outer) separation

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

Leak tests How to proceed ? -Better tubes & taps -Atmospheric pressure & temperature monitoring -Flow controller -Nitrogen/Argon

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