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Leak Testing Basics

TQC Leak Test Systems
Other TQC Services
Contact Information

TQC Ltd, Hooton Street,
Carlton Road, Nottingham,
Notts. NG3 2NJ,

Tel: +44 (0) 115 9503561
Fax: +44 (0) 115 9484642


Leak Testing Machine / Leak Test Equipment

The leak test method used is very dependant on the specific application and the leak rate that is acceptable, these principles are outlined on the Basic Principles Page.

TQC Ltd specialise in standard and bspoke solutions for the automatic leak testing of components using water submersal, air decay, vacuum or helium methods.


For these systems, standard leak measurement instruments are incorporated . Test pressures between vacuum and 16bar (150psig) are available as standard. Leak measurement may be made down to a resolution of 1 atm.mm3/sec. All test parameters may be programmed into the instruments, and the result data is available for subsequent SPC analysis.

Helium Systems

For these systems, TQC provide complete test facilities utilising leak test instruments and pumping groups from proven, world-leading companies that specialise in Helium leak test instrumentation. Helium leak testing is generally used for specifications which are too stringent for pressure decay, or where the component is large in volume or not stable in shape or temperature. The leak measurement resolution may be typically 1 x 10-6 atm.mm3/sec.

Pressure Decay

Vacuum Decay

Helium Detection
  • Lowest cost
  • Simple to understand
  • Direct value results
  • Direct calibration
  • Temperature dependent
  • Component must be stable
  • Limits temperature effects
  • Assists sealing loading
  • Reduced stabilisation time
  • Often a faster throughput
  • Indirect leak calculation
  • Complex fault detection
  • Most sensitive (x 10-6)
  • Independent of temperature
  • Independent of volume
  • High throughput
  • Most expensive
  • Most complex

Key Benefits of using TQC:

  • 20 years Experience in specialised test & handling equipment
  • Professional & Flexible approach to all engineering tasks bestowed upon us
  • All work completed in house - so the buck stops here!
  • 24hour Customer support, backup and service call-out for all projects large and small

Test Equipment Capabilities

TQC combines extensive experience with a modular approach. The best modern data capture methods and proven software techniques are engineered into your production environment to provide reliable and easily maintainable equipment.

Air/vacuum leak testing

  Environment Testing

Gas trace leak testing


Flash testing


If you have a current project that you are already looking at, or you are considering improvements to your production in the near future, call us and we will be happy to offer our professional advice & visit you at your site.

Air Decay Leak Testing :: Helium Leak Testing :: Pressure Testing :: Fixture & Seal Design Specialists