CLPT – Calibrated Leak Permeation Teflon


The CLPT Accu-Flow™ model helium calibrated leak standards, which feature Teflon® permeation leak elements, are widely used for calibrating helium mass spectrometer leak detectors and leak testing systems. They are part of a family of calibrators including the GPP, GPC and CLP models offered by VTI that cover leak rates from E-12 up to E-3 atm-cc/sec
and larger. VTI’s experts are always eager to help you select the best model for your application.

The CLPT's flow-rate control element is a thin Teflon® membrane. The Helium reservoir is under pressure, and gas permeates through the Teflon® from the pressurized side to the exhaust side of the element. This yields a precise, constant flow rate which is then used for calibrating helium leak detectors and other applications. VTI offers the CLPT Leaks both with and without a shut-off valve. The inlet port of the brand of leak detector or vacuum system determines the termination of the leak.

All leaks are available with QF (NW, KF), Normal Pipe Thread, VCR® and many other types of fittings. All CLPT Leaks are provided with certifications of the NIST-traceable calibrations performed in our A2LA-accredited Calibration Laboratory.

  • Never clogs: permeation leak element eliminates the threat of clogging
  • Versatile: available lea-rates range from E-3 to E-9
  • Long-lasting: low depletion rate
  • Simple: requires minimal user training
  • Meets ISO requirements: NIST-traceable, A2LA-accredited Calibration Certification

Do you have any questions?