ASTM F78-97(2002)

Standard Test Method for Calibration of Helium Leak Detectors by Use of Secondary Standards (Withdrawn 2008)

SCOPE
1.1 This test method covers a procedure for calibrating a mass spectrometer-type helium leak detector with a series of commercially available calibrated leaks without need for recourse to a primary standard.
1.2 Leak detector parameters determined by this test method include:
1.2.1 Minimum detectable signal, drift noise (8.5, with recorder; 8.6, without recorder),
1.2.2 Response time,
1.2.3 Minimum detectable leak rate, and
1.2.4 Sensitivity.
1.3 This standard does not purport to address 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.
WITHDRAWN RATIONALE
Formerly under the jurisdiction of Committee F01 on Electronics, this test method was withdrawn in June 2008 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

• Status: Withdrawn
• Publication Date: 09-Dec-2002
• Withdrawal Date: 29-Jul-2008
• ICS: 31.080.01 - Semiconductor devices in general
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.03 - Metallic Materials, Wire Bonding, and Flip Chip

Relations

• Replaces: ASTM F78-97 - Standard Test Method for Calibration of Helium Leak Detectors by Use of Secondary Standards
• Effective Date: 10-Dec-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F 78–97 (Reapproved 2002)
Standard Test Method for
Calibration of Helium Leak Detectors by Use of Secondary
1
Standards
ThisstandardisissuedunderthefixeddesignationF78;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.3 standard leak rate—in leak detection, the rate of flow
of atmospheric air of dewpoint less than−25°C through a leak
1.1 This test method covers a procedure for calibrating a
under standard conditions specified as follows: (1) the inlet
mass spectrometer-type helium leak detector with a series of
pressure shall be 1 standard atmosphere 65% (1016 5 kPa),
commercially available calibrated leaks without need for
(2) the outlet pressure shall be less than 1 kPa (0.01 atm), and
recourse to a primary standard.
(3) the temperature shall be 23 6 3°C.
1.2 Leakdetectorparametersdeterminedbythistestmethod
3.2 Definitions of Terms Specific to This Standard:
include:
3.2.1 response time—of a leak detector, for the purposes of
1.2.1 Minimum detectable signal, drift noise (8.5, with
this test method, a measure of the speed of response of the
recorder; 8.6, without recorder),
detector to an incoming helium sample.
1.2.2 Response time,
3.2.1.1 Discussion—In this test method the cleanup time
1.2.3 Minimum detectable leak rate, and
and response time are assumed to be equal.
1.2.4 Sensitivity.
3.2.2 sensitivity—of a leak detector, for the purposes of this
1.3 This standard does not purport to address the safety
test method, the ratio of the change in the output signal to the
concerns, if any, associated with its use. It is the responsibility
applied helium leak rate.
of the user of this standard to establish appropriate safety and
3.3 Other terms used in this test method are defined in
health practices and determine the applicability of regulatory
Definitions E425.
limitations prior to use.
4. Summary of Test Method
2. Referenced Documents
4.1 Atleastthreecalibratedleaksaretestedonaheliumleak
2.1 ASTM Standards:
2
detector, and a correlation is obtained between the output
E1 Specification for ASTM Thermometers
3
indicationoftheleakdetectorandtheleakrateofthecalibrated
E425 Definitions of Terms Relating to Leak Testing
leaks. These readings are used to plot a calibration line from
3. Terminology which intermediate values, within specified limits, may be
read.
3.1 Definitions:
3.1.1 calibrated leak—in leak detection, a device that per-
5. Interferences
mits leakage through it at a specified rate, of a specific gas,
5.1 Certain materials, particularly organic compounds, will
under specific conditions, with the downstream side of the
entrap or hold helium tracer gas. Use of such materials in
deviceexposedtoapressuresufficientlylowtohavenegligible
connections between the calibrated leak and the leak should be
effect on the leak rate.
minimized to avoid erroneous results. (If the net output
3.1.2 minimum detectable signal—in leak detection, the
readings from any calibrated leak consistently lie outside the
smallest unambiguous output signal that can be derived from a
established limits, the leak should be returned to the supplier
given particular leak detector. Units are detector scale divi-
for a recalibration check.)
sions.
5.2 The background reading, B, should be at most one
3.1.2.1 Discussion—The minimum detectable signal is de-
quarter of the output reading, A. If the value of B approaches
terminedbythenoisepresentin,anddriftof,theoutputsignal.
thatofA,theaccuracyofthedeterminationofNwillsuffer(see
9.3.1).
1
This test method is under the jurisdiction of ASTM Committee F01 on
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
6. Apparatus
Materials.
Current edition approved Dec. 10, 2002. Published May 2003. Originally
6.1 Calibrated Leaks—At least three commercial devices
approved in 1967. Last previous edition approved in 1997 as F78 – 97.
incorporating leaks, one having a leak rate of approximately
2
Annual Book of ASTM Standards, Vol 14.03.
−9 3 −1 −10 3 −1
3 10 atm·cm ·s (10 Pa·m ·s ), a second having a leak
Discontinued. See 1991 Annual Book of ASTM Standards, Vol 03.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F 78–97 (2002)
−8 −7 3 −1 −9
value in the nominal range from 10 to 10 atm·cm ·s (10
−8 3 −1
to 10 Pa·m ·s ), and the third having a leak rate of
−6 3 −1 −7 3 −1
approximately 10 atm·cm ·s (10 Pa·m ·s ).
6.1.1 The calibrated leaks shall be obtained from at least
two independent suppliers.
6.1.2 The calibrated leaks shall have been cali
...