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ASTM G179-04(2019)

(Specification)

Standard Specification for Metal Black Panel and White Panel Temperature Devices for Natural Weathering Tests

Standard Specification for Metal Black Panel and White Panel Temperature Devices for Natural Weathering Tests

SCOPE
1.1 This specification provides specific information for the manufacturing and use of metal black and white panel temperature devices to measure temperatures that estimate highest maximum (black) and lowest maximum (white) temperatures of coated metal specimens during natural weathering tests.  
1.1.1 The construction of a black or white panel has a significant effect on the indicated temperature. This standard describes a robust construction from the panels investigated, which has been shown to provide the highest, most consistent temperatures when compared side-by-side with other black panel constructions.  
1.2 This specification includes details on design requirements and quantitative measurement techniques, which will lead to the proper selection of materials and use for black and white panel temperature sensors.  
1.3 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 requirements prior to use.
Note 1: There is no equivalent ISO standard describing the selection and use of black panel sensors for natural weathering tests.  
1.4 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.

General Information

Status
Published
Publication Date
30-Jun-2019
ICS
17.200.20 - Temperature-measuring instruments
Technical Committee
G03 - Weathering and Durability
Drafting Committee
G03.02 - Natural and Environmental Exposure Tests
Current Stage
Ref Project

Relations

Refers
ASTM G147-17 - Standard Practice for Conditioning and Handling of Nonmetallic Materials for Natural and Artificial Weathering Tests
Effective Date
01-Jun-2017
Referred By
ASTM G201-16 - Standard Practice for Conducting Exposures in Outdoor Glass-Covered Exposure Apparatus with Air Circulation
Effective Date
01-Jul-2019
Referred By
ASTM G90-23 - Standard Practice for Performing Accelerated Outdoor Weathering of Materials Using Concentrated Natural Sunlight
Effective Date
01-Jul-2019

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ASTM G179-04(2019) - Standard Specification for Metal Black Panel and White Panel Temperature Devices for Natural Weathering TestsASTM G179-04(2019) - Standard Specification for Metal Black Panel and White Panel Temperature Devices for Natural Weathering Tests
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ASTM G179-04(2019) - Standard Specification for Metal Black Panel and White Panel Temperature Devices for Natural Weathering Tests
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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.
Designation:G179 −04(Reapproved 2019)
Standard Specification for
Metal Black Panel and White Panel Temperature Devices for
1
Natural Weathering Tests
This standard is issued under the fixed designation G179; 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.
1. Scope E220 Test Method for Calibration of Thermocouples By
Comparison Techniques
1.1 This specification provides specific information for the
E430 TestMethodsforMeasurementofGlossofHigh-Gloss
manufacturing and use of metal black and white panel tem-
Surfaces by Abridged Goniophotometry
perature devices to measure temperatures that estimate highest
E772 Terminology of Solar Energy Conversion
maximum (black) and lowest maximum (white) temperatures
E881 Practice for Exposure of Solar Collector Cover Mate-
of coated metal specimens during natural weathering tests.
rials to Natural Weathering Under Conditions Simulating
1.1.1 The construction of a black or white panel has a
Stagnation Mode
significant effect on the indicated temperature. This standard
E903 Test Method for Solar Absorptance, Reflectance, and
describes a robust construction from the panels investigated,
Transmittance of Materials Using Integrating Spheres
which has been shown to provide the highest, most consistent
G7 Practice for Atmospheric Environmental Exposure Test-
temperatures when compared side-by-side with other black
ing of Nonmetallic Materials
panel constructions.
G113 Terminology Relating to Natural andArtificial Weath-
1.2 This specification includes details on design require-
ering Tests of Nonmetallic Materials
ments and quantitative measurement techniques, which will
G147 Practice for Conditioning and Handling of Nonmetal-
lead to the proper selection of materials and use for black and
lic Materials for Natural and Artificial Weathering Tests
white panel temperature sensors.
G151 Practice for Exposing Nonmetallic Materials inAccel-
1.3 This standard does not purport to address all of the
erated Test Devices that Use Laboratory Light Sources
3
safety concerns, if any, associated with its use. It is the
2.2 ISO Standard:
responsibility of the user of this standard to establish appro-
ISO 4892-1 Plastics: Exposure to Laboratory Light
priate safety, health, and environmental practices and deter-
Sources—General Guidance
mine the applicability of regulatory requirements prior to use.
3. Terminology
NOTE 1—There is no equivalent ISO standard describing the selection
and use of black panel sensors for natural weathering tests.
3.1 The definitions given in Terminologies G113 and E772
1.4 This international standard was developed in accor-
are applicable to this practice.
dance with internationally recognized principles on standard-
4. Significance and Use
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4.1 The measurement of the primary elements of weather;
mendations issued by the World Trade Organization Technical
solar radiation, temperature, and moisture is necessary to
Barriers to Trade (TBT) Committee.
quantify the weather conditions during exposure in natural
weathering (outdoor) tests. This practice is applicable to
2. Referenced Documents
weathering tests described in Practices G7, G24, or D4141
2
2.1 ASTM Standards:
(Method A) and other standards in which these standards are
D523 Test Method for Specular Gloss
referenced.
4.2 The surface temperature of exposed materials depends
1
This specification is under the jurisdiction of ASTM Committee G03 on
Weathering and Durability and is the direct responsibility of Subcommittee G03.02 primarily on the amount of radiation absorbed, the emissivity
on Natural and Environmental Exposure Tests.
of the specimen, the thermal conduction within the specimen,
Current edition approved July 1, 2019. Published August 2019. Originally
and the heat transfer between the specimen and the air in
approvedin2004.Lastpreviouseditionapprovedin2011asG179 – 04(2011).DOI:
contact with the specimen surface and specimen holder. Since
10.1520/G0179-04R19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © AST
...

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1.2 The tests are intended to ensure that the thermocouple assemblies have not been damaged during storage or installation, to ensure that the extension wires have been attached to connectors and terminals with the correct polarity, and to provide benchmark data for later reference when testing to assess possible damage of the thermocouple assembly after operation. Some of these tests may not be appropriate for thermocouples that have been exposed to temperatures higher than the recommended limits for the particular type.  
1.3 The tests described herein include methods to measure the following characteristics of installed sheathed thermocouple assemblies and to provide benchmark data for determining if the thermocouple assembly has been subsequently damaged in operation:  
1.3.1 Loop Resistance:  
1.3.1.1 Thermoelements,
1.3.1.2 Combined extension wires and thermoelements.  
1.3.2 Insulation Resistance:  
1.3.2.1 Insulation, thermocouple assembly,
1.3.2.2 Insulation, thermocouple assembly and extension wires.  
1.3.3 Seebeck Voltage:  
1.3.3.1 Thermoelements,
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1.1 This specification covers the requirements for simplex, compacted mineral-insulated, metal-sheathed (MIMS), Type K and N thermocouples for nuclear or other high reliability service. Depending on size, these thermocouples are normally suitable for operating temperatures to 1652 °F [900 °C]; special conditions of environment and life expectancy may permit their use at temperatures in excess of 2012 °F [1100 °C]. This specification was prepared to detail requirements for this type of MIMS thermocouple for use in nuclear environments, but they can also be used for laboratory or general commercial applications where the environmental conditions exceed normal service requirements. The intended use of a MIMS thermocouple in a specific nuclear application will require evaluation of the compatibility of the thermocouple, including the effect of the temperature, atmosphere, and integrated neutron flux on the materials and accuracy of the thermoelements in the proposed application by the purchaser.  
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1.3 General Design—Nominal sizes of the finished thermocouples shall be 0.0400 in., 0.0625 in., 0.125 in., 0.1875 in., or 0.250 in. [1.000 mm, 1.500 mm, 3.000 mm, 4.500 mm, or 6.000 mm]. Sheath dimensions and tolerances for each nominal size shall be in accordance with Table 1 and Figs. 1 and 2. The measuring junction styles for thermocouples covered by this specification are as follows:  
FIG. 1 Grounded Measuring Junction, Style G  
FIG. 2 Ungrounded Measuring Junction, Style U  
1.3.1 Style G2  (grounded)—The measuring junction is electrically connected to its conductive sheath, and  
1.3.2 Style U2 (ungrounded)—The measuring junction is electrically isolated from its conductive sheath and from reference ground.  
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not exact equivalents or conversions; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the 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.  
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1.4 The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this 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.

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