ASTM E908 - 98(2018) - Standard Practice for Calibrating Gaseous Reference Leaks

ASTM E908 - 98(2018)

Standard Practice for Calibrating Gaseous Reference Leaks

Status : Current   Published : June 2018

Format
PDF

Format
HARDCOPY



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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6  This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.




Standard NumberASTM E908 - 98(2018)
TitleStandard Practice for Calibrating Gaseous Reference Leaks
StatusCurrent
Publication Date01 June 2018
Normative References(Required to achieve compliance to this standard)No other standards are normatively referenced
Informative References(Provided for Information)No other standards are informatively referenced
Descriptors Calibration, Counters And Detectors, Leak Detectors, Leak Test, Leakage Rate, Physical Properties
ICS17.060
PublisherASTM
FormatA4
DeliveryYes
Pages7
File Size283 KB
Price£40.00


 Your basket
Your basket is empty

Multi-user access to over 3,500 medical device standards, regulations, expert commentaries and other documents


Worldwide Standards
We can source any standard from anywhere in the world


Tracked Changes

Understand the changes made to a standard with our new Tracked Changes version


BSOL

The faster, easier way to work with standards