ASTM B389-81(2004)
(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
This test method simulates, to a practical degree, the operation of the thermostat metal coil.
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.
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 the standard. The metric equivalents of inch-pound units may be approximate.
1.3 This standard does not purport to address all of the safety problems, 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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: B 389 – 81 (Reapproved 2004)
Standard Test Method for
Thermal Deflection Rate of Spiral and Helical Coils of
Thermostat Metal
This standard is issued under the fixed designation B 389; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.3 spiral coil—a part made by winding strip on itself. Fig.
1andFig.2showtypicalspiralcoils,whichcanbewoundwith
1.1 Thistestmethodcoversthedeterminationofthethermal
the low-expansive side inside or outside, mounted on the
deflection rate of spiral and helical coils of thermostat metal.
specimen holder.
1.2 The values stated in inch-pound units are to be regarded
3.4 helical coil—a part made by winding strip in a form
as the standard. The metric equivalents of inch-pound units
wherein the plane of the width of the strip is parallel to the
may be approximate.
axial length. Fig. 3 shows a typical helical coil, which can be
1.3 This standard does not purport to address all of the
wound with the low-expansive side inside or outside, and
safety concerns, if any, associated with its use. It is the
right-hand or left-hand, mounted on the specimen holder.
responsibility of the user of this standard to become familiar
with all hazards including those identified in the appropriate
4. Summary of Test Method
Material Safety Data Sheet for this product/material as pro-
4.1 The test for thermal deflection rate of spiral and helical
vided by the manufacturer, to establish appropriate safety and
coils consists of measuring the angular rotation that a coil
health practices, and determine the applicability of regulatory
undergoes in response to a known temperature change.
limitations prior to use.
5. Significance and Use
2. Referenced Documents
5.1 This test method simulates, to a practical degree, the
2.1 ASTM Standards:
operation of the thermostat metal coil.
E 77 Test Method for Inspection and Verification of Ther-
5.2 The thermal deflection properties of a coil may vary
mometers
from lot-to-lot of thermostat metal material. This method is
3. Terminology useful for determining the optimum thickness and length of the
material for a given deflection specification.
3.1 thermostat metal—a composite material, usually in the
5.3 This method is useful as a quality test to determine
form of sheet or strip, comprising two or more materials of any
acceptance or rejection of a lot of thermostat metal coils.
appropriate nature, metallic or otherwise, that, by virtue of
differing expansivities of the components, tends to alter its
6. Apparatus
curvature when its temperature is changed.
6.1 Temperature Bath—A stirred liquid bath or uniformly
3.2 thermal deflection rate—the ratio of angular rotation to
heated enclosure in which the specimen and mounting fixture
temperature change. It is a measure of the coil’s thermal
can be placed shall be used. An adjustable heating source is
activity. It may have the units of angular degrees per degree
desirable for maintaining the specimen at the desired tempera-
Fahrenheit, or Celsius, and is expressed by the equation D
tures with a variation in temperature throughout the specimen
=(A −A )/(T −T ) where A and A are angular positions at
2 1 2 1 2 1
not to exceed 0.5°F (0.3°C).
temperature T and T respectively.
2 1
6.2 Protractor—The angular position at each test tempera-
tureshallbemeasuredbyaprotractorwithaminimumdivision
This test method is under the jurisdiction of ASTM Committee B02 on
of 0.5°.
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
6.3 Temperature-Measuring Apparatus—The apparatus for
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
making temperature measurements shall be of such accuracy
Current edition approved May 1, 2004. Published June 2004. Originally
approved in 1962. Last previous edition approved in 1981 as B 389 – 81 (1998).
that the individual temperatures shall be known to be within
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
60.5°F (60.3°C).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.4 Specimen Holder—The preferred methods of holding
Standards volume information, refer to the standard’s Document Summary page on
spiral and helical coils are as follows:
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 389 – 81 (2004)
6.4.3 Deviations from these procedures of holding may be
necessary when simulating the mounting used in the device for
which the coil was designed, or in cases where coils are press
fitted on arbors. In these cases, the details of mounting should
be mutually agreed upon between the manufacturer and the
purchaser.
6.5 Transmission Pointer:
6.5.1 Spiral Coils—To the outer end of the spiral coil shall
be attached a pointer that will transmit the rotation of the coil
so that it can be read on the protractor. The pointer shall be of
lightweight construction and attached to the coil by suitable
means so that the movement of these portions of the coil that
do not normally contribute to the movement of the coil with a
temperature change shall not influence the rotation of the
pointer. The pointer, when using the fixture shown in Fig. 1,
shall be so positioned that its tip shall ride slightly above the
divisions of the protractor, but shall not touch the protractor at
any time during the test. The pointer, when using the fixture
shown in Fig. 2, shall be of sufficient length so that the top may
protrude from the bath when the coil is submerged.The pointer
for either method, shall be so positioned that it will be in line
with the radius of the protractor and the specimen.
6.5.2 Helical Coils—To the free end of the helical coils
shall be attached a shaft that will transmit the rotation of the
coil so that it can be read on the protractor. The shaft can
consist of a wire or rod and shall be of lightweight construc-
tion. It shall be attached to the coil by a suitable means so that
the mov
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