ASTM E644-04

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: E 644 – 04
Standard Test Methods for
1
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 344 Terminology Relating to Thermometry and Hydrom-
etry
1.1 These test methods cover the principles, apparatus, and
E 563 Practice for Preparation and Use of an Ice-Point Bath
procedures for calibration and testing of industrial resistance
3
as a Reference Temperature
thermometers.
E 1137 Specification Industrial Platinum Resistance Ther-
1.2 These test methods cover the tests for insulation resis-
mometers
tance, calibration, immersion error, pressure effects, thermal
E 1502 Guide for Use of Freezing–Point Cells for Refer-
response time, vibration effect, mechanical shock, self-heating
ence Temperatures
effect, stability, thermoelectric effect, humidity, thermal hys-
E 1750 Guide for Use of Water Triple Point Cells
teresis and thermal shock.
E 1751 Guide to Temperature Electromotive Force (EMF)
1.3 These test methods are not necessarily intended for,
Tables for Non-Letter Designated Thermocouple Combi-
recommended to be performed on, or appropriate for every
nations
type of thermometer. The expected repeatability and reproduc-
2.2 Military Standard:
ibility of the results are tabulated in Appendix X4.
MIL-STD-202 Test Methods for Electronic and Electrical
1.4 These test methods, when specified in a procurement
4
Component Parts
document, shall govern the method of testing the resistance
thermometer.
3. Terminology
1.5 Thermometer performance specifications, acceptance
3.1 Definitions of Terms Specific to This Standard:
limits, and sampling methods are not covered in these test
3.1.1 The definitions given in Terminology E 344 shall
methods; they should be specified separately in the procure-
apply to these test methods.
ment document.
3.1.2 bath gradient error, n—the error caused by tempera-
1.6 This standard does not purport to address all of the
ture differences in the working space of the bath. (The bath or
safety concerns, if any, associated with its use. It is the
temperature equalizing blocks should be explored to determine
responsibility of the user of this standard to establish appro-
the work areas in which the temperature gradients are insig-
priate safety and health practices and determine the applica-
nificant.)
bility of regulatory limitations prior to use. Specific precau-
3.1.3 calibration, n—the determination of the indications of
tionary statements are given in 6.3.2, 6.3.5, and 8.1.
a thermometer with respect to temperatures established by a
2. Referenced Documents standard resulting in scale corrections to be applied when
2
maximum accuracy is required.
2.1 ASTM Standards:
3.1.4 connecting wire error, n—the error caused by uncom-
E 77 Test Method for the Inspection and Verification of
pensated connecting wire resistance. (Although the connecting
Thermometers
wire is part of the measurement circuit, most of it is not at the
E 230 Temperature-Electromotive Force (EMF) Tables for
temperature that is being determined. Thermometers are avail-
Standardized Thermocouples
able in two-, three-, and four-wire configurations. There is no
satisfactory way to compensate for the wire resistance in the
1
These test methods are under the jurisdiction of ASTM Committee E20 on measurement with a two-wire thermometer although the wire
TemperatureMeasurementandarethedirectresponsibilityofSubcommitteeE20.03
resistance can be compensated for in three and four-wire
on Resistance Thermometers.
thermometers.)
Current edition approved May 1, 2004. Published May 2004. Originally
approved in 1978. Last previous edition approved in 2002 as E 644 – 02.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Withdrawn.
4
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E644–04
3.1.5 immersion error, n—an error caused by the heat The most probable factors that contribute to insulation failure
conduction or radiation, or both, between the resistance ther- are contamination, typically from moisture, and mechanical
mometerelementandtheenvironmentexternaltothemeasure- breakdownduetophysicaldamagetothedevi
...