LEAK DETECTION Section 7 Other leak detectors 2004

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LEAK DETECTION Section 7 Other leak detectors © 2004. IUVSTA 7. 01

LEAK DETECTION Section 7 Other leak detectors © 2004. IUVSTA 7. 01

Ion Pump as a Leak Detector Cathodes B Ion B + + + Electron

Ion Pump as a Leak Detector Cathodes B Ion B + + + Electron A + + Anode cell © 2004. IUVSTA 7. 02

Internal View of the Helitest Platinum Heater Ion Pump 0. 2 L/sec Probe Sampling

Internal View of the Helitest Platinum Heater Ion Pump 0. 2 L/sec Probe Sampling Pump High Voltage Supply Current Amplifier MICROPROCESSOR © 2004. IUVSTA Display Keyboard 7. 03

Vacuum Gauges as Leak Detectors Simple vacuum gauges are used for leak detection applications

Vacuum Gauges as Leak Detectors Simple vacuum gauges are used for leak detection applications such as furnaces for heat treatment or freeze drying chambers. Chamber Factory Scale System Vacuum Gauge Diffusion, ejector or dry pumping combination © 2003, Steve Hoath © 2004. IUVSTA 7. 04

Vacuum Gauges and RGAs as Leak Monitors Ionization gauges can be placed to directly

Vacuum Gauges and RGAs as Leak Monitors Ionization gauges can be placed to directly measure the pressure. A quadrupole mass spectrometer or RGA samples the residual gases and can monitor several masses individually. Spectrometer or RGA outputs can be used to signal specific gas type leakage. Filament Collector Quadrupole Type of RGA Grid Ion source © 2004. IUVSTA 7. 05

SF 6 Leak Testing Sensor Gas discharge port Inner Electrode Electrical Connection To the

SF 6 Leak Testing Sensor Gas discharge port Inner Electrode Electrical Connection To the power Supply and Signal display Probe Inlet Capillary Argon gas Inlet port (Weakly) Radioactive Source ( ) © 2004. IUVSTA 7. 06

Bubble test and similar methods: Table of fluid combinations used in leak tests by

Bubble test and similar methods: Table of fluid combinations used in leak tests by visual inspection External fluid Surface tension 10 -4 N/m Ether 1. 7 Acetone 2. 4 Methanol 2. 3 Ethanol 2. 2 Internal fluid under pressure Indication of leak by 0. 5 (H 2) Very sensitive ~10 (air) Large, slow H 2 (hazard), He, clean air Alcohol Water Minimum leak [10 -6 mbarl/s] 7. 3 Soap solution ~10 (air) Weak detergent Phenolic paint 5 Discoloration white HCl (corrosive) 50 Vapour clouds CO 2 (hood) NH 3 50. . 500 Clouds of NHCO 3 Agar-agar solution (~65 - 70°C) H 2 O Large leaks only Wet external surface Atmospheric air Oil >~0. 5 mbarl/s © 2004. IUVSTA 7. 07

85 Kr as test gas – 85 Kr decay scheme 10. 6 year 0.

85 Kr as test gas – 85 Kr decay scheme 10. 6 year 0. 46% - 0. 15 Me. V 99. 54% - 0. 67 Me. V 0. 52 Me. V 85 Kr © 2004. IUVSTA 85 Rb 7. 08

LEAK DETECTION Section 4 Helium mass spectrometer leakLEAK DETECTION Section 4 Helium mass spectrometer leak
Leak Detection NIGHT FLOW MEASUREMENT STEP TESTING LEAKLeak Detection NIGHT FLOW MEASUREMENT STEP TESTING LEAK
CHAPTER 3 LEAK DETECTION PROCEDURES TYPES OF LEAKCHAPTER 3 LEAK DETECTION PROCEDURES TYPES OF LEAK
LEAK DETECTION Section 8 References Acknowledgements 2004 IUVSTALEAK DETECTION Section 8 References Acknowledgements 2004 IUVSTA
Xray detectors single photon detectors scintillation detectors gasfilledXray detectors single photon detectors scintillation detectors gasfilled
Leak Check Training Leak Checks Shall Be ConductedLeak Check Training Leak Checks Shall Be Conducted
Weaknesses leak Weaknesses leak Weaknesses fourth element ofWeaknesses leak Weaknesses leak Weaknesses fourth element of