ASTM D7607/D7607M-11e1

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Designation: D7607/D7607M − 11
Standard Test Method for
Analysis of Oxygen in Gaseous Fuels (Electrochemical
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Sensor Method)
This standard is issued under the fixed designation D7607/D7607M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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ε NOTE—This standard was revised editorially in October 2013 to reflect dual designation.
1. Scope 3.2.1 electrochemical sensor—Achemical sensor that quan-
titatively measures an analyte by the electrical output produced
1.1 This test method is for the determination of oxygen (O )
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by the sensor.
in gaseous fuels and fuel type gases. It is applicable to the
measurement of oxygen in natural gas and other gaseous fuels. 3.2.2 span calibration—The adjustment of the transmitter
This method can be used to measure oxygen in helium, electronics to the sensor’s signal output for a given oxygen
hydrogen, nitrogen, argon, carbon dioxide, mixed gases, pro- standard.
cess gases, and ambient air.The applicable range is 0.1 ppm(v)
3.2.3 zero calibration—The adjustment of the transmitter
to 25% by volume.
electronics to the sensor’s signal output for a sample gas
1.2 The values stated in either SI units or inch-pound units containing less than 0.1ppm(v) oxygen.
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each 4. Summary of Test Method
system shall be used independently of the other. Combining
4.1 Measurement of oxygen is accomplished by comparing
values from the two systems may result in non-conformance
the electrical signal produced by an unknown sample with that
with the standard.
of a known standard using an oxygen specific electrochemical
1.3 This standard does not purport to address all of the
sensor. A gaseous sample at constant flow and temperature is
safety concerns, if any, associated with its use. It is the
passed over the electrochemical cell. Oxygen diffuses into the
responsibility of the user of this standard to establish appro-
sensor and reacts chemically at the sensing electrode to
priate safety and health practices and determine the applica-
produce an electrical current output proportional to the oxygen
bility of regulatory limitations prior to use.
concentration in the gas phase. Experience has shown that the
types of sensors supplied with equipment used in this standard
2. Referenced Documents
typically have a linear response over the ranges of application
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which remains stable during the sensor’s useful life. The
2.1 ASTM Standards:
analyzer consists of a sensor, a sample flow system, and the
D4150 Terminology Relating to Gaseous Fuels
electronics to accurately determine the sensor signal.
D5503 Practice for Natural Gas Sample-Handling and Con-
ditioning Systems for Pipeline Instrumentation
5. Significance and Use
3. Terminology
5.1 This test method is primarily used to monitor the
3.1 For general terminology see Terminology D4150. concentration of oxygen in gases to verify gas quality for
operational needs and contractual obligations. Oxygen content
3.2 Definitions:
isamajorfactorinfluencinginternalcorrosion,fuelquality,gas
quality, and user and operator safety.
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ThistestmethodisunderthejurisdictionofASTMCommitteeD03onGaseous
6. Interferences
Fuels and is the direct responsibility of Subcommittee D03.12 on On-Line/At-Line
Analysis of Gaseous Fuels.
6.1 Interfering gases such as oxides of sulfur, oxides of
CurrenteditionapprovedJune1,2011.PublishedJuly2011.Originallyapproved
nitrogen, and hydrogen sulfide can produce false readings and
in 2011. Last previous edition approved in 2011 as D7607–11. DOI: 10.1520/D7607
_D7607M-11E01.
reduce the expected life of the sensor. Scrubbers are used to
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
remove these compounds. Special sensors suitable for gas
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
containing high fractions of carbon dioxide are available from
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. manufacturers.
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D7607/D7607M − 11
7. Apparatus 9. Preparation of Apparatus and Calibration
9.1 Zero alibration—In theory the oxygen sensor produces
7.1 Sensor—The sealed sensor is contained in a housing
no signal when exposed to oxygen free sample gas. In reality,
constructed of stainless steel or other non-permeable material.
expect the sensor to generate an oxygen
...