ASTM E2593-12
(Guide)Standard Guide for Accuracy Verification of Industrial Platinum Resistance Thermometers
Standard Guide for Accuracy Verification of Industrial Platinum Resistance Thermometers
SIGNIFICANCE AND USE
5.1 This guide is intended to be used for verifying the resistance-temperature relationship of industrial platinum resistance thermometers that are intended to satisfy the requirements of Specification E1137/E1137M. It is intended to provide a consistent method for calibration and uncertainty evaluation while still allowing the user some flexibility in the choice of apparatus and instrumentation. It is understood that the limits of uncertainty obtained depend in large part upon the apparatus and instrumentation used. Therefore, since this guide is not prescriptive in approach, it provides detailed instruction in uncertainty evaluation to accommodate the variety of apparatus and instrumentation that may be employed.
5.2 This guide is intended primarily to satisfy applications requiring compliance to Specification E1137/E1137M. However, the techniques described may be appropriate for applications where higher accuracy calibrations are needed.
5.3 Many applications require tolerances to be verified using a minimum test uncertainty ratio (TUR). This standard provides guidelines for evaluating uncertainties used to support TUR calculations.
SCOPE
1.1 This guide describes the techniques and apparatus required for the accuracy verification of industrial platinum resistance thermometers constructed in accordance with Specification E1137/E1137M and the evaluation of calibration uncertainties. The procedures described apply over the range of –200°C to 650°C.
1.2 This guide does not intend to describe procedures necessary for the calibration of platinum resistance thermometers used as calibration standards or Standard Platinum Resistance Thermometers. Consequently, calibration of these types of instruments is outside the scope of this guide.
1.3 Industrial platinum resistance thermometers are available in many styles and configurations. This guide does not purport to determine the suitability of any particular design, style, or configuration for calibration over a desired temperature range.
1.4 The evaluation of uncertainties is based upon current international practices as described in ISO/TAG 4/WG 3 “Guide to the Evaluation of Uncertainty in Measurement” and ANSI/NCSL Z540-2-1997 “U.S. Guide to the Expression of Uncertainty in Measurement.”
1.5 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.
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Designation:E2593 −12
Standard Guide for
Accuracy Verification of Industrial Platinum Resistance
1
Thermometers
This standard is issued under the fixed designation E2593; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E563Practice for Preparation and Use of an Ice-Point Bath
as a Reference Temperature
1.1 This guide describes the techniques and apparatus re-
E644Test Methods for Testing Industrial Resistance Ther-
quired for the accuracy verification of industrial platinum
mometers
resistancethermometersconstructedinaccordancewithSpeci-
E1137/E1137MSpecification for Industrial Platinum Resis-
fication E1137/E1137M and the evaluation of calibration
tance Thermometers
uncertainties.Theproceduresdescribedapplyovertherangeof
E1502Guide for Use of Fixed-Point Cells for Reference
–200°C to 650°C.
Temperatures
1.2 This guide does not intend to describe procedures
E1750Guide for Use of Water Triple Point Cells
necessary for the calibration of platinum resistance thermom-
2.2 ANSI Publication:
eters used as calibration standards or Standard Platinum
ANSI/NCSL Z540-2-1997U.S. Guide to the Expression of
Resistance Thermometers. Consequently, calibration of these 3
Uncertainty in Measurement
types of instruments is outside the scope of this guide.
2.3 Other Publication:
1.3 Industrial platinum resistance thermometers are avail-
ISO/TAG4/WG3GuidetotheEvaluationofUncertaintyin
able in many styles and configurations. This guide does not
Measurement
purport to determine the suitability of any particular design,
3. Terminology
style, or configuration for calibration over a desired tempera-
ture range.
3.1 Definitions—ThedefinitionsgiveninTerminologyE344
shall be considered as applying to the terms used in this guide.
1.4 The evaluation of uncertainties is based upon current
international practices as described in ISO/TAG 4/WG 3
3.2 Definitions of Terms Specific to This Standard:
“Guide to the Evaluation of Uncertainty in Measurement” and
3.2.1 annealing, v—a heat treating process intended to
ANSI/NCSL Z540-2-1997 “U.S. Guide to the Expression of
stabilize resistance thermometers prior to calibration and use.
Uncertainty in Measurement.”
3.2.2 check standard, n—athermometersimilarindesignto
1.5 This standard does not purport to address all of the
the unit under test, but of superior stability, which is included
safety concerns, if any, associated with its use. It is the
in the calibration process for the purpose of quantifying the
responsibility of the user of this standard to establish appro-
process variability.
priate safety and health practices and determine the applica-
3.2.3 coverage factor, n—numerical factor used as a multi-
bility of regulatory limitations prior to use.
plierofthecombinedstandarduncertaintyinordertoobtainan
expanded uncertainty.
2. Referenced Documents
2
3.2.4 dielectric absorption, n—an effect in an insulator
2.1 ASTM Standards:
caused by the polarization of positive and negative charges
E344Terminology Relating to Thermometry and Hydrom-
within the insulator which manifests itself as an in-phase
etry
current when the voltage is removed and the charges recom-
bine.
1
This guide is under the jurisdiction ofASTM Committee E20 on Temperature
MeasurementandisthedirectresponsibilityofSubcommitteeE20.03onResistance 3.2.5 expanded uncertainty, U, n—quantity defining an
Thermometers.
interval about the result of a measurement that may be
Current edition approved Nov. 1, 2012. Published December 2012. Originally
expected to encompass a large fraction of the distribution of
approved in 2007. Last previous edition approved in 2011 as D5456–11E01. DOI:
values that could reasonably be attributed to the measurand.
10.1520/E2593-12.
2
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
3
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E2593−12
3.2.5.1 Discussion—Normally, U is given at a coverage thermometer. However a liquid in glass (LIG) thermometer,
factor of 2, approximating to a 95% confidence interval. thermistor, or thermocouple may be acceptable depending
uponthetemperatureofcalibration,requiredaccuracy,orother
3.2.6 hysteresis, n—property associated with the r
...
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.
´1
Designation: E2593 − 11 E2593 − 12
Standard Guide for
Accuracy Verification of Industrial Platinum Resistance
1
Thermometers
This standard is issued under the fixed designation E2593; 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
εNOTE—The previous epsilon note was removed in July 2011.
1. Scope
1.1 This guide describes the techniques and apparatus required for the accuracy verification of industrial platinum resistance
thermometers constructed in accordance with Specification E1137/E1137M and the evaluation of calibration uncertainties. The
procedures described apply over the range of –200°C to 650°C.
1.2 This guide does not intend to describe procedures necessary for the calibration of platinum resistance thermometers used
as calibration standards or Standard Platinum Resistance Thermometers. Consequently, calibration of these types of instruments
is outside the scope of this guide.
1.3 Industrial platinum resistance thermometers are available in many styles and configurations. This guide does not purport to
determine the suitability of any particular design, style, or configuration for calibration over a desired temperature range.
1.4 The evaluation of uncertainties is based upon current international practices as described in ISO/TAG 4/WG 3 “Guide to
the Evaluation of Uncertainty in Measurement” and ANSI/NCSL Z540-2-1997 “U.S. Guide to the Expression of Uncertainty in
Measurement.”
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
E344 Terminology Relating to Thermometry and Hydrometry
E563 Practice for Preparation and Use of an Ice-Point Bath as a Reference Temperature
E644 Test Methods for Testing Industrial Resistance Thermometers
E1137/E1137M Specification for Industrial Platinum Resistance Thermometers
E1502 Guide for Use of Fixed-Point Cells for Reference Temperatures
E1750 Guide for Use of Water Triple Point Cells
2.2 ANSI Publication:
3
ANSI/NCSL Z540-2-1997 U.S. Guide to the Expression of Uncertainty in Measurement
2.3 Other Publication:
ISO/TAG 4/WG 3 Guide to the Evaluation of Uncertainty in Measurement
3. Terminology
3.1 Definitions—The definitions given in Terminology E344 shall be considered as applying to the terms used in this guide.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 annealing, v—a heat treating process intended to stabilize resistance thermometers prior to calibration and use.
1
This guide is under the jurisdiction of ASTM Committee E20 on Temperature Measurement and is the direct responsibility of Subcommittee E20.03 on Resistance
Thermometers.
Current edition approved May 1, 2011Nov. 1, 2012. Published June 2011December 2012. Originally approved in 2007. Last previous edition approved in 20072011 as
D5456–07E01.–11E01. DOI: 10.1520/E2593-11E01.10.1520/E2593-12.
2
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E2593 − 12
3.2.2 check standard, n—a thermometer similar in design to the unit under test, but of superior stability, which is included in
the calibration process for the purpose of quantifying the process variability.
3.2.3 coverage factor, n—numerical factor used as a multiplier of the combined standard uncertainty in order to obtain an
expanded uncertainty.
3.2.4 dielectric absorption, n—an effect in an insulator caused by the polarization of positive and negative charges within the
insulator which manifests itself as an in-phase current when the voltage is removed and the charges recombine.
3.2.5 expanded uncertainty, U, n—quantity defining an interval about the result of a measurement that may be expec
...
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