ASTM E644-06
(Test Method)Standard Test Methods for Testing Industrial Resistance Thermometers
Standard Test Methods for Testing Industrial Resistance Thermometers
SIGNIFICANCE AND USE
These test methods provide uniform methods for testing industrial resistance thermometers so that a given tester may expect to obtain the same value of a test result from making successive measurements on the same test article within the limits of repeatability given in Appendix X4. Independent testers may also expect to obtain the same result from the testing of the same article within the limits of reproducibility given in Appendix X4.
These tests may be used to qualify platinum resistance thermometers for use in specific applications to meet a particular specification such as Specification E 1137/E 1137M, or to evaluate relative merits of equivalent test articles supplied by one or more manufacturers, or to determine the limits of the application of a particular design of thermometer.
The expected repeatability and reproducibility of selected test methods are included in Appendix X4.
Some non-destructive tests described in these test methods may be applied to thermometers that can be subsequently sold or used; other destructive tests may preclude the sale or use of the test article because of damage that the test may produce.
SCOPE
1.1 These test methods cover the principles, apparatus, and procedures for calibration and testing of industrial resistance thermometers.
1.2 These test methods cover the tests for insulation resistance, calibration, immersion error, pressure effects, thermal response time, vibration effect, mechanical shock, self-heating effect, stability, thermoelectric effect, humidity, thermal hysteresis, thermal shock, and end seal integrity.
1.3 These test methods are not necessarily intended for, recommended to be performed on, or appropriate for every type of thermometer. The expected repeatability and reproducibility of the results are tabulated in .
1.4 These test methods, when specified in a procurement document, shall govern the method of testing the resistance thermometer.
1.5 Thermometer performance specifications, acceptance limits, and sampling methods are not covered in these test methods; they should be specified separately in the procurement document.
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 and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in 6.3.2, 6.3.5, and 8.1..
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Standards Content (Sample)
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Designation: E 644 – 06
Standard Test Methods for
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Testing Industrial Resistance Thermometers
This standard is issued under the fixed designation E 644; 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 E 230 Specification and Temperature-Electromotive Force
(EMF) Tables for Standardized Thermocouples
1.1 These test methods cover the principles, apparatus, and
E 344 Terminology Relating to Thermometry and Hydrom-
procedures for calibration and testing of industrial resistance
etry
thermometers.
E 563 Practice for Preparation and Use of an Ice-Point Bath
1.2 These test methods cover the tests for insulation resis-
as a Reference Temperature
tance, calibration, immersion error, pressure effects, thermal
E 1137/E 1137M Specification for Industrial Platinum Re-
response time, vibration effect, mechanical shock, self-heating
sistance Thermometers
effect, stability, thermoelectric effect, humidity, thermal hys-
E 1502 GuideforUseofFreezing-PointCellsforReference
teresis, thermal shock, and end seal integrity.
Temperatures
1.3 These test methods are not necessarily intended for,
E 1750 Guide for Use of Water Triple Point Cells
recommended to be performed on, or appropriate for every
E 1751 Guide for Temperature Electromotive Force (EMF)
type of thermometer. The expected repeatability and reproduc-
Tables for Non-Letter Designated Thermocouple Combi-
ibility of the results are tabulated in Appendix X4.
nations
1.4 These test methods, when specified in a procurement
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2.2 Military Standard:
document, shall govern the method of testing the resistance
MIL-STD-202 Test Methods for Electronic and Electrical
thermometer.
Component Parts
1.5 Thermometer performance specifications, acceptance
limits, and sampling methods are not covered in these test
3. Terminology
methods; they should be specified separately in the procure-
3.1 Definitions of Terms Specific to This Standard:
ment document.
3.1.1 The definitions given in Terminology E 344 shall
1.6 This standard does not purport to address all of the
apply to these test methods.
safety concerns, if any, associated with its use. It is the
3.1.2 bath gradient error, n—the error caused by tempera-
responsibility of the user of this standard to establish appro-
ture differences in the working space of the bath. (The bath or
priate safety and health practices and determine the applica-
temperature equalizing blocks should be explored to determine
bility of regulatory limitations prior to use. Specific precau-
the work areas in which the temperature gradients are insig-
tionary statements are given in 6.3.2, 6.3.5, and 8.1.
nificant.)
2. Referenced Documents 3.1.3 calibration, n—the determination of the indications of
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a thermometer with respect to temperatures established by a
2.1 ASTM Standards:
standard resulting in scale corrections to be applied when
E77 Test Method for Inspection and Verification of Ther-
maximum accuracy is required.
mometers
3.1.4 connecting wire error, n—the error caused by uncom-
pensated connecting wire resistance. (Although the connecting
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wire is part of the measurement circuit, most of it is not at the
These test methods are under the jurisdiction of ASTM Committee E20 on
TemperatureMeasurementandarethedirectresponsibilityofSubcommitteeE20.03
temperature that is being determined. Thermometers are avail-
on Resistance Thermometers.
able in two-, three-, and four-wire configurations. There is no
CurrenteditionapprovedJune1,2006.PublishedJuly2006.Originallyapproved
satisfactory way to compensate for the wire resistance in the
in 1978. Last previous edition approved in 2004 as E 644 – 04.
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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
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Standards volume information, refer to the standard’s Document Summary page on Available from Superintendent of Documents, U.S. Government Printing
the ASTM website. Office, Washington, DC 20234.
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E644–06
measurement with a two-wire thermometer although the wire measurement circuit, or any circuit failure if the excitation
resistance can be compensated for in three and four-wire source is grounded.This test assumes that the thermometer has
thermometers.) a metallic or other electrically conductive sheath or housing.
3.1.5 immersion error, n—an error caused by the heat The most probable factors that contribute to insulation failure
conductio
...
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