General & Precision He Calibrators

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If you are unsure, please read below for guidance or call the factory for further assistance.

CHOOSING A CALIBRATOR FOR HELIUM LEAK DETECTORS

VTI manufactures four models of Calibrated Leak Standards for calibrating Helium Leak Detectors and Leak Testing Systems so that one is sure to meet your particular requirements. Many other models of Leak Standards are made by VTI, including some that are specifically for calibrating Sniffer-type Leak Detectors, as detailed in other brochures and a Selection Guide. As the major manufacturer of Calibrated Leaks for all gases and all leak rates for calibrating leak detectors, leak testing systems and various other applications, VTI supplies them worldwide to users, distributors and other manufacturers.

The GPP, GPPT, GPC and CLP Model Calibrators compared here have different types of Leak Elements to control the flow rate of Helium, and this results in different features as shown below. Another difference is that the GPP, GPPT and GPC Leaks are "general purpose" models for calibrating leak detectors and systems, and the CLP Leak is a "high-precision" model with an all-metal valve for use in critical applications, use with UHV systems, and use as a Calibration Transfer Standard. It is to be noted, however, that all four models demonstrate long-term flow rate stability, have low depletion rates and last for years without refilling. As an exception, the 10-3 and larger GPC Leaks have higher depletion rates and, therefore, are designed to be conveniently refilled by the user. Also, all four models are simple to operate and are provided with Certifications of the NIST-traceable A2LA-accredited Calibrations.

The differences among these four Helium Detector Calibrators are highlighted in the comparisons below. VTI's experts are always eager to help you select the best model - technically and cost - for your application. Without obligation, of course.

CHOOSING THE RIGHT LEAK

  • Choose the GPP Model when:

  • You need a Calibrator in the leak rate ranges of 10-6 to 10-9, especially 10-7 and 10-8.
  • You want the glass-permeation leak element that will not clog.
  • It will not be subjected to rough handling that would break the glass leak element.
  • Your facility does not have wide temperature fluctuations, so you are not inconvenienced by the 4% per °C temperature coefficient.

  • Choose the GPPT Model when:

  • You need a Calibrator in the leak rate ranges of 10-4 to 10-8.
  • You want the TeflonŽ-permeation leak element that will not clog.
  • You want a Calibrator that is unbreakable.
  • You are not inconvenienced by the 3% per °C temperature coefficient

  • Choose the GPC Model when:

  • You need a leak rate in the range of 10-6 to 10-3 and larger, especially 10-5 and larger.
  • Your clean environment or large leak rates avoids clogging of the capillary leak element.
  • You want a Calibrator that is unbreakable.
  • Your facility has wide temperature fluctuations so that the very low temperature coefficient (0.2% per °C) is a significant benefit.

  • Choose the CLP Model when:

  • You need a Calibrator in the leak rate ranges of 10-6 to 10-12, especially 10-9 to 10-12.
  • You want the glass-permeation leak element that will not clog.
  • It will not be subjected to rough handling that would break the glass leak element.
  • You are not inconvenienced by the 4% per °C temperature coefficient.
  • You need a model to use as a Transfer Standard for calibrating other Test Leaks.
  • You need a Premium model with an all-metal valve that can be used for critical calibrations and can be baked for UHV applications.