ASTM B389-81(2016)

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 and health practices, and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 30-Apr-2016
• ICS: 29.120.20 - Connecting devices
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.10 - Thermostat Metals and Electrical Resistance Heating Materials

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:B389 −81(Reapproved 2016)
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 D=(A −A )/(T −T ) where A and A are angular positions
2 1 2 1 2 1
at temperature T and T respectively.
2 1
1.1 Thistestmethodcoversthedeterminationofthethermal
3.3 spiral coil, n—a part made by winding strip on itself.
deflection rate of spiral and helical coils of thermostat metal.
Fig. 1 and Fig. 2 show typical spiral coils, which can be wound
1.2 The values stated in inch-pound units are to be regarded
with the low-expansive side inside or outside, mounted on the
as standard. The values given in parentheses are mathematical
specimen holder.
conversions to SI units that are provided for information only
3.4 helical coil, n—a part made by winding strip in a form
and are not considered standard.
wherein the plane of the width of the strip is parallel to the
1.3 This standard does not purport to address all of the
axial length. Fig. 3 shows a typical helical coil, which can be
safety concerns, if any, associated with its use. It is the
wound with the low-expansive side inside or outside, and
responsibility of the user of this standard to become familiar
right-hand or left-hand, mounted on the specimen holder.
with all hazards including those identified in the appropriate
Safety Data Sheet (SDS) for this product/material as provided
4. Summary of Test Method
by the manufacturer, to establish appropriate safety and health
4.1 The test for thermal deflection rate of spiral and helical
practices, and determine the applicability of regulatory limi-
coils consists of measuring the angular rotation that a coil
tations prior to use.
undergoes in response to a known temperature change.
2. Referenced Documents
5. Significance and Use
2
2.1 ASTM Standards:
5.1 This test method simulates, to a practical degree, the
E77 Test Method for Inspection and Verification of Ther-
operation of the thermostat metal coil.
mometers
5.2 The thermal deflection properties of a coil may vary
from lot-to-lot of thermostat metal material. This method is
3. Terminology
useful for determining the optimum thickness and length of the
3.1 thermostat metal, n—a composite material, usually in
material for a given deflection specification.
the form of sheet or strip, comprising two or more materials of
5.3 This method is useful as a quality test to determine
any appropriate nature, metallic or otherwise, that, by virtue of
acceptance or rejection of a lot of thermostat metal coils.
differing expansivities of the components, tends to alter its
curvature when its temperature is changed.
6. Apparatus
3.2 thermal deflection rate, n—the ratio of angular rotation
6.1 Temperature Bath—A stirred liquid bath or uniformly
to temperature change. It is a measure of the coil’s thermal
heated enclosure in which the specimen and mounting fixture
activity. It may have the units of angular degrees per degree
can be placed shall be used. An adjustable heating source is
Fahrenheit, or Celsius, and is expressed by the equation
desirable for maintaining the specimen at the desired tempera-
tures with a variation in temperature throughout the specimen
not to exceed 0.5°F (0.3°C).
1
This test method is under the jurisdiction of ASTM Committee B02 on
6.2 Protractor—The angular position at each test tempera-
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
tureshallbemeasuredbyaprotractorwithaminimumdivision
Current edition approved May 1, 2016. Published May 2016. Originally
of 0.5°.
approved in 1962. Last previous edition approved in 2008 as B389 – 81 (2008).
DOI: 10.1520/B0389-81R16.
6.3 Temperature-Measuring Apparatus—The apparatus for
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
making temperature measurements shall be of such accuracy
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
that the individual temperatures shall be known to be within
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 60.5°F (60.3°C).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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B389−81(2016)
can be affixed to the top end. The center line of the coil, the
transmission pointer, and the protractor shall coincide.
6.4.3
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B389 − 81 (Reapproved 2008) B389 − 81 (Reapproved 2016)
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
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 Material Safety Data
Sheet (MSDS)(SDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices,
and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
E77 Test Method for Inspection and Verification of Thermometers
3. Terminology
3.1 thermostat metal, n—a composite material, usually in the form of sheet or strip, comprising two or more materials of any
appropriate nature, metallic or otherwise, that, by virtue of differing expansivities of the components, tends to alter its curvature
when its temperature is changed.
3.2 thermal deflection rate, n—the ratio of angular rotation to temperature change. It is a measure of the coil’s thermal activity.
It may have the units of angular degrees per degree Fahrenheit, or Celsius, and is expressed by the equation D = (A − A )/
2 1
(T − T ) where A and A are angular positions at temperature T and T respectively.
2 1 2 1 2 1
3.3 spiral coil, n—a part made by winding strip on itself. Fig. 1 and Fig. 2 show typical spiral coils, which can be wound with
the low-expansive side inside or outside, mounted on the specimen holder.
3.4 helical coil, n—a part made by winding strip in a form wherein the plane of the width of the strip is parallel to the axial
length. Fig. 3 shows a typical helical coil, which can be wound with the low-expansive side inside or outside, and right-hand or
left-hand, mounted on the specimen holder.
4. Summary of Test Method
4.1 The test for thermal deflection rate of spiral and helical coils consists of measuring the angular rotation that a coil undergoes
in response to a known temperature change.
5. 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.
1
This test method is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.10 on
Thermostat Metals and Electrical Resistance Heating Materials.
Current edition approved Nov. 1, 2008May 1, 2016. Published November 2008May 2016. Originally approved in 1962. Last previous edition approved in 20042008 as
B389 – 81 (2004).(2008). DOI: 10.1520/B0389-81R08.10.1520/B0389-81R16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B389 − 81 (2016)
FIG. 1 Spiral Coil
6. Apparatus
6.1 Temperature Bath—A stirred liquid bath or uniformly heated enclosure in which the specimen and mounting fixture can be
placed shall be used. An adjustable heating source is desirable for maintaining the specimen at the desired temperatures with a
variation in temperature throughout the specimen not to exceed 0.5°F (0.3°C).
6.2 Protractor—Th
...