ASTM E908 - 98(2012)

    Standard Practice for Calibrating Gaseous Reference Leaks

    Active Standard ASTM E908 | Developed by Subcommittee: E07.08

    Book of Standards Volume: 03.03


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    ASTM E908

    Abstract

    This practice establishes the standard procedures for calibrating leak artifacts of a specified gas, that may be used for determining the response of leak detectors, or in other situations where a known small flow of gas is required. The purpose of this practice is to establish calibration without reference to other calibrated leaks in as straightforward a manner as possible using the likeliest available equipment. The two types of leaks considered here are Type I, which is pressure to vacuum, and Type II, which is pressure to atmosphere. Three calibration methods are described under each type of reference leak, as follows: Method Aaccumulation comparison using a known volume of tracer gas at specified conditions of temperature and pressure as a reference; Method Baccumulation comparison using a reference leak artifact calibrated using Method A; and Method Cdirect measurement of leak rate by timing the movement (displacement) of a liquid slug, by the leak, in a capillary tube of known dimensions.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 This practice covers procedures for calibrating leak artifacts of a specified gas, that may be used for determining the response of leak detectors, or in other situations where a known small flow of gas is required. The purpose of this practice is to establish calibration without reference to other calibrated leaks in as straightforward a manner as possible using the likeliest available equipment. While the uncertainties associated with these procedures will most likely be greater than those obtained via traceable calibration chains (on the order of 10 %), these procedures allow independent means of establishing or verifying the leakage rate from leak artifacts of questionable history, or when traceable leak artifacts are not available.

    1.2 Two types of leaks are considered:

    1.2.1 Type I—Pressure to vacuum.

    1.2.2 Type II—Pressure to atmosphere.

    1.3 Three calibration methods are described under each type of reference leak:

    1.3.1 Method A—Accumulation comparison, using a known volume of gas at specified conditions of temperature and pressure as a reference.

    1.3.2 Method B—Accumulation comparison, using a leak artifact calibrated using Method A.

    1.3.3 Method C—Displacement of a liquid slug, by the leak, in capillary tube of known dimensions.

    1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    E425 Definitions of Terms Relating to Leak Testing

    E427 Practice for Testing for Leaks Using the Halogen Leak Detector(Alkali-Ion Diode)

    E479 Guide for Preparation of a Leak Testing Specification

    F134 Test Methods for Determining Hermeticity of Electron Devices with a Helium Mass Spectrometer Leak Detector

    Other Documents

    Recommended Practices for the Calibration and Use of Leaks C.D. Ehrlich and J.A. Basford, Journal of Vac. Sci, Technology, A(10), 1992, pp. 1-17.


    ICS Code

    ICS Number Code 17.060 (Measurement of volume, mass, density, viscosity)

    UNSPSC Code

    UNSPSC Code 41111809(Leak testing equipment)


    DOI: 10.1520/E0908-98R12

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