GPC Accu-Flow™ helium calibrated leak standards, which feature crimped stainless steel capillary leak elements, are widely used to tune and calibrate helium mass spectrometer leak detectors and leak testing systems. They are part of a family of VTI helium calibrators that includes the GPP, GPPT and CLP models. Together, they cover a wide range of leak rates from E-12 to E-2 atm-cc/sec and larger. VTI’s experts are always eager to help you select the best model for your application.

Because they use capillary leak elements, our GPC helium leaks can be manufactured for larger leak rates than permeation-style leaks and are ideal for calibrating detectors in “gross leak” mode. Also, capillary-type leaks have a very low temperature coefficient of 0.2% per degree Celsius, compared to 3-4% for permeation-style leaks. This reduces the possibility of calibration error in applications where ambient temperatures vary widely. Their stainless steel capillaries make GPC helium leaks far more durable than leaks that rely on leak elements made of glass.

Plugging is a threat with all capillary leaks. To prevent plugging, be sure to close the shut-off valve whenever the GPC Accu-Flow™ helium calibrated leak is not in use. This is especially important whenever venting a vacuum system or detector to which the leak is attached. If customers intend to install their leak in a non-sterile environment, they may consider using one of our Teflon permeation leaks instead. 

As with all of VTI’s Helium Calibrators, the GPC Model Leaks are available with QF (NW,KF), pipe thread and many other types of attachment fittings, and are provided with Certifications of the NIST-traceable Calibrations performed in our A2LA Calibration Laboratory.