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ASTM B389-81(2020)

(Test Method)

Standard Test Method for Thermal Deflection Rate of Spiral and Helical Coils of Thermostat Metal

Standard Test Method for Thermal Deflection Rate of Spiral and Helical Coils of Thermostat Metal

SIGNIFICANCE AND USE
5.1 This test method simulates, to a practical degree, the operation of the thermostat metal coil.  
5.2 The thermal deflection properties of a coil may vary from lot-to-lot of thermostat metal material. This method is useful for determining the optimum thickness and length of the material for a given deflection specification.  
5.3 This method is useful as a quality test to determine acceptance or rejection of a lot of thermostat metal coils.
SCOPE
1.1 This test method covers the determination of the thermal deflection rate of spiral and helical coils of thermostat metal.  
1.2 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.  
1.3 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 become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
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-Sep-2020
ICS
29.120.20 - Connecting devices
Technical Committee
B02 - Nonferrous Metals and Alloys
Drafting Committee
B02.10 - Thermostat Metals and Electrical Resistance Heating Materials
Current Stage
Ref Project

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ASTM B389-81(2020) - Standard Test Method for Thermal Deflection Rate of Spiral and Helical Coils of Thermostat MetalASTM B389-81(2020) - Standard Test Method for Thermal Deflection Rate of Spiral and Helical Coils of Thermostat Metal
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ASTM B389-81(2020) - Standard Test Method for Thermal Deflection Rate of Spiral and Helical Coils of Thermostat Metal
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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: B389 −81 (Reapproved 2020)
Standard Test Method for
Thermal Deflection Rate of Spiral and Helical Coils of
1
Thermostat Metal
This standard is issued under the fixed designation B389; 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 differing expansivities of the components, tends to alter its
curvature when its temperature is changed.
1.1 Thistestmethodcoversthedeterminationofthethermal
3.2 thermal deflection rate, n—the ratio of angular rotation
deflection rate of spiral and helical coils of thermostat metal.
to temperature change. It is a measure of the coil’s thermal
1.2 The values stated in inch-pound units are to be regarded
activity. It may have the units of angular degrees per degree
as standard. The values given in parentheses are mathematical
Fahrenheit, or Celsius, and is expressed by the equation
conversions to SI units that are provided for information only
D=(A −A )/(T −T ) where A and A are angular positions
2 1 2 1 2 1
and are not considered standard.
at temperature T and T respectively.
2 1
1.3 This standard does not purport to address all of the
3.3 spiral coil, n—a part made by winding strip on itself.
safety concerns, if any, associated with its use. It is the
Fig. 1 and Fig. 2 show typical spiral coils, which can be wound
responsibility of the user of this standard to become familiar
with the low-expansive side inside or outside, mounted on the
with all hazards including those identified in the appropriate
specimen holder.
Safety Data Sheet (SDS) for this product/material as provided
3.4 helical coil, n—a part made by winding strip in a form
by the manufacturer, to establish appropriate safety, health,
wherein the plane of the width of the strip is parallel to the
and environmental practices, and determine the applicability
axial length. Fig. 3 shows a typical helical coil, which can be
of regulatory limitations prior to use.
wound with the low-expansive side inside or outside, and
1.4 This international standard was developed in accor-
right-hand or left-hand, mounted on the specimen holder.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Summary of Test Method
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4.1 The test for thermal deflection rate of spiral and helical
Barriers to Trade (TBT) Committee.
coils consists of measuring the angular rotation that a coil
undergoes in response to a known temperature change.
2. Referenced Documents
2
2.1 ASTM Standards: 5. Significance and Use
E77 Test Method for Inspection and Verification of Ther-
5.1 This test method simulates, to a practical degree, the
mometers
operation of the thermostat metal coil.
5.2 The thermal deflection properties of a coil may vary
3. Terminology
from lot-to-lot of thermostat metal material. This method is
3.1 thermostat metal, n—a composite material, usually in
useful for determining the optimum thickness and length of the
the form of sheet or strip, comprising two or more materials of
material for a given deflection specification.
any appropriate nature, metallic or otherwise, that, by virtue of
5.3 This method is useful as a quality test to determine
acceptance or rejection of a lot of thermostat metal coils.
1
This test method is under the jurisdiction of ASTM Committee B02 on
6. Apparatus
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
6.1 Temperature Bath—A stirred liquid bath or uniformly
Current edition approved Oct. 1, 2020. Published October 2020. Originally
heated enclosure in which the specimen and mounting fixture
approved in 1962. Last previous edition approved in 2016 as B389 – 81 (2016).
DOI: 10.1520/B0389-81R20.
can be placed shall be used. An adjustable heating source is
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
desirable for maintaining the specimen at the desired tempera-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
tures with a variation in temperature throughout the specimen
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. not to exceed 0.5°F (0.3°C).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

...

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SIGNIFICANCE AND USE
4.1 The purpose of this guide is to provide end-product manufacturers and other users with technical information and methods recommended towards the achievement of successful application of crimped wire terminals.  
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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 become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
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    6 pages
    English language
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