ASTM D2624-02
(Test Method)Standard Test Methods for Electrical Conductivity of Aviation and Distillate Fuels
Standard Test Methods for Electrical Conductivity of Aviation and Distillate Fuels
SCOPE
1.1 These test methods cover the determination of the electrical conductivity of aviation and distillate fuels with and without a static dissipator additive. The test methods normally give a measurement of the conductivity when the fuel is uncharged, that is, electrically at rest (known as the rest conductivity).
1.2 Two test methods are available for field tests of fuel conductivity. These are: (a) portable meters for the direct measurement in tanks or the field or laboratory measurement of fuel samples, and (b) in-line meters for the continuous measurement of fuel conductivities in a fuel distribution system. In using either type of instrument, care must be taken in allowing the relaxation of residual electrical charges before measurement and in preventing fuel contamination. For specification purposes, conductivity measurements should be made with the portable meters.
1.3 The values stated in SI units are to be regarded as the standard.
1.4 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. For specific precautionary statements, see 7.1, 7.1.1, and 11.2.1.
General Information
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
An American National Standard
Designation: D 2624 – 02
Designation: 274/99
Standard Test Methods for
1
Electrical Conductivity of Aviation and Distillate Fuels
This standard is issued under the fixed designation D2624; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope D4306 Practice for Aviation Fuel Sample Containers for
2
Tests Affected by Trace Contamination
1.1 These test methods cover the determination of the
D4308 Test Method for Electrical Conductivity of Liquid
electrical conductivity of aviation and distillate fuels with and
2
Hydrocarbons by Precision Meter
without a static dissipator additive. The test methods normally
give a measurement of the conductivity when the fuel is
3. Terminology
uncharged, that is, electrically at rest (known as the rest
3.1 Definitions:
conductivity).
3.1.1 picosiemens per metre, n—the unit of electrical con-
1.2 Two test methods are available for field tests of fuel
ductivity is also called a conductivity unit (CU). A siemen is
conductivity. These are: (1) portable meters for the direct
the SI definition of reciprocal ohm sometimes called mho.
measurementintanksorthefieldorlaboratorymeasurementof
212 21 21
fuel samples, and (2) in-line meters for the continuous mea-
1pS/m 51 310 V m 51cu 51picomho/m (1)
surementoffuelconductivitiesinafueldistributionsystem.In
3.1.2 rest conductivity, n—thereciprocaloftheresistivityof
using either type of instrument, care must be taken in allowing
uncharged fuel in the absence of ionic depletion or polariza-
the relaxation of residual electrical charges before measure-
tion.
ment and in preventing fuel contamination. For specification
3.1.2.1 Discussion—It is the electrical conductivity at the
purposes, conductivity measurements should be made with the
initial instant of current measurement after a dc voltage is
portable meters.
impressed between electrodes.
1.3 The values stated in SI units are to be regarded as the
standard.
4. Summary of Test Methods
1.4 This standard does not purport to address all of the
4.1 Avoltageisappliedacrosstwoelectrodesinthefueland
safety concerns, if any, associated with its use. It is the
the resulting current expressed as a conductivity value. With
responsibility of the user of this standard to establish appro-
portable meters, the current measurement is made almost
priate safety and health practices and determine the applica-
instantaneously upon application of the voltage to avoid errors
bility of regulatory limitations prior to use. For specific
duetoiondepletion.Iondepletionorpolarizationiseliminated
precautionary statements, see 7.1, 7.1.1, and 11.2.1.
in dynamic monitoring systems by continuous replacement of
the sample in the measuring cell. The procedure, with the
2. Referenced Documents
correct selection of electrode size and current measurement
2.1 ASTM Standards:
apparatus, can be used to measure conductivities from 1 pS/m
orgreater.Thecommerciallyavailableequipmentreferredtoin
1 these methods covers a conductivity range up to 2000 pS/m
These test methods are under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and are the direct responsibility of Subcommit- with good precision (see Section 12), although some meters
tee D02.J0 on Aviation Fuels.
can only read to 500 or 1000 pS/m.
In the IP, these test methods are under the jurisdiction of the Standardization
Committee.
Current edition approved June 10, 2002. Published August 2002. Originally
2
published as D2624–67T. Last previous edition D2624–01. Annual Book of ASTM Standards, Vol 05.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D2624–02
4.1.1 The EMCEE Model 1152 Meter is available with sation on the cell can occur, which can cause abnormally high
expandedrangesbuttheprecisionoftheextendedrangemeters zero, calibration and sample readings. This can be avoided by
has not been determined. If it is necessary to measure conduc- storing the cell at a temperature 2 to 5°C in excess of the
tivities below 1 pS/m, for example in the case of clay treated maximum ambient temperature where this is practicable.
fuels or refined hydrocarbon solvents, Test Method D4308 8.2 The sample size should be as large as practicable, and
should be used. not less than 1 L.
8.3 The conductivity of fuels containing static dissipator
5. Significance and Use
additives is affected by sunlight and other strong light sources.
S
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.