ASTM E879-20

Standard Specification for Thermistor Sensors for General Purpose and Laboratory Temperature Measurements

ABSTRACT
This specification covers the classification, testing, and corresponding requirements for negative-temperature-coefficient thermistor-type sensors intended to be used for clinical laboratory temperature measurements or control, or both, within a specified range. This specification also covers the detailed requirements for ASTM designated sensors.
SCOPE
1.1 This specification covers the general requirements for Negative Temperature Coefficient (NTC) thermistor-type sensors intended to be used for laboratory temperature measurements or control, or both, within the range from −10 °C to 105 °C.  
1.2 This specification also covers the detailed requirements for ASTM designated sensors.  
1.3 This specification also covers the requirements for general purpose, Negative Temperature Coefficient (NTC) thermistor-type sensors intended for use with Digital Contact Thermometers (also known as Digital Thermometers) within the range from –50 °C to +150 °C.  
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Apr-2020
• ICS: 17.200.20 - Temperature-measuring instruments
• Technical Committee: E20 - Temperature Measurement
• Drafting Committee: E20.03 - Resistance Thermometers

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:E879 −20
Standard Specification for
Thermistor Sensors for General Purpose and Laboratory
1
Temperature Measurements
This standard is issued under the fixed designation E879; 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 specification covers the general requirements for
E1502Guide for Use of Fixed-Point Cells for Reference
Negative Temperature Coefficient (NTC) thermistor-type sen-
Temperatures
sors intended to be used for laboratory temperature measure-
E1750Guide for Use of Water Triple Point Cells
ments or control, or both, within the range from−10 °C to
E2488Guide for the Preparation and Evaluation of Liquid
105 °C.
Baths Used for Temperature Calibration by Comparison
1.2 This specification also covers the detailed requirements
F29Specification for Dumet Wire for Glass-to-Metal Seal
for ASTM designated sensors.
Applications
3
1.3 This specification also covers the requirements for 2.2 NIST Documents:
general purpose, Negative Temperature Coefficient (NTC)
NIST Monograph 126Platinum Resistance Thermometry
thermistor-type sensors intended for use with Digital Contact NIST Special Publication 250-22Platinum Resistance Ther-
Thermometers (also known as Digital Thermometers) within
mometer Calibration
the range from –50 °C to +150 °C. NIST Technical Note 1265Guidelines for Realizing the
International Temperature Scale of 1990
1.4 The values stated in SI units are to be regarded as the
2.3 Other Documents:
standard. The values given in parentheses are for information
JCGM100:2008Evaluationofmeasurementdata–Guideto
only.
4
the expression of uncertainty in measurement
1.5 This standard does not purport to address all of the
ANSI/NCSL Z540.3-2006 (R2013)Requirements for the
safety concerns, if any, associated with its use. It is the
5
Calibration of Measuring and Test Equipment
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
3. Terminology
mine the applicability of regulatory limitations prior to use.
3.1 Definitions—The definitions given in Terminology
1.6 This international standard was developed in accor-
E344 shall apply to this specification.
dance with internationally recognized principles on standard-
3.2 Definitions of Terms Specific to This Standard:
ization established in the Decision on Principles for the
3.2.1 dissipation constant, δ,n—the ratio of the change in
Development of International Standards, Guides and Recom-
energy dissipated per unit time (power) in a thermistor,
mendations issued by the World Trade Organization Technical
∆P= P − P , to the resultant temperature change of the
2 1
Barriers to Trade (TBT) Committee.
thermistor, ∆T= T − T .
2 1
2. Referenced Documents
∆P
2 δ 5 (1)
2.1 ASTM Standards: ∆T
E344Terminology Relating to Thermometry and Hydrom-
The dimensions of the dissipation constant are watts per
etry
kelvin (W/K). Note that many NTC thermistors are very
small devices, and as such, the dissipation constant dimen-
1
This specification is under the jurisdiction of ASTM Committee E20 on
sions are frequently expressed in terms of milliwatts per kel-
Temperature Measurement and is the direct responsibility of Subcommittee E20.03
vin (mW/K).
on Resistance Thermometers.
CurrenteditionapprovedMay1,2020.PublishedJuly2020.Originallyapproved
in 1982. Last previous edition approved in 2012 as E879–12. DOI: 10.1520/
3
E0879-20. Available from National Institute of Standards and Technology (NIST), 100
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
4
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Available from the BIPM, Sevres, France, http:// www.bipm.org.
5
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, PA19428-2959. United States
1

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E879−20
For this specification, T is in the range from 20 °C to 38 °C 4.2.1 Type Designation—Thetypedesignationcodeshallbe
1
and ∆T=10 °C. a letter symbol to indicate the design a
...

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: E879 − 12 E879 − 20
Standard Specification for
Thermistor Sensors for General Purpose and Laboratory
1
Temperature Measurements
This standard is issued under the fixed designation E879; 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 specification covers the general requirements for Negative Temperature Coefficient (NTC) thermistor-type sensors
intended to be used for laboratory temperature measurements or control, or both, within the range from −10from −10 °C to
105°C.105 °C.
1.2 This specification also covers the detailed requirements for ASTM designated sensors.
1.3 This specification also covers the requirements for general purpose, Negative Temperature Coefficient (NTC) thermistor-
type sensors intended for use with Digital Contact Thermometers (also known as Digital Thermometers) within the range from
–50–50 °C to +150°C.+150 °C.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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
E1502 Guide for Use of Fixed-Point Cells for Reference Temperatures
E1750 Guide for Use of Water Triple Point Cells
E2488 Guide for the Preparation and Evaluation of Liquid Baths Used for Temperature Calibration by Comparison
F29 Specification for Dumet Wire for Glass-to-Metal Seal Applications
3
2.2 NIST Documents:
NIST Monograph 126 Platinum Resistance Thermometry
NIST Special Publication 250-22 Platinum Resistance Thermometer Calibration
NIST Technical Note 1265 Guidelines for Realizing the International Temperature Scale of 1990
2.3 Other Documents:
4
JCGM 100:2008 Evaluation of measurement data – Guide to the expression of uncertainty in measurement
5
ANSI/NCSL Z540.3-2006 (R2013) Requirements for the Calibration of Measuring and Test Equipment
1
This specification 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, 2012May 1, 2020. Published June 2012July 2020. Originally approved in 1982. Last previous edition approved in 20072012 as E879 – 01
(2007).E879 – 12. DOI: 10.1520/E0879-01R07.10.1520/E0879-20.
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’s Document Summary page on the ASTM website.
3
Available from National Institute of Standards and Technology (NIST), 100 Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
4
Available from the BIPM, Sevres, France, http:// www.bipm.org.
5
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 ----------------------
E879 − 20
3. Terminology
3.1 Definitions—The definitions given in Terminology E344 shall apply to this specification.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 dissipation constant, δ, n—the ratio of the change in energy dissipated per unit time (power) in a thermistor, ΔP = P −
2
P , to the resultant temperature change of the thermistor, ΔT = T − T .
1 2 1
ΔP
δ5 (1)
ΔT
The dimensions of the dissipation constant are W/K.watts per kelvin (W/K). Note that many NTC thermistors are very
small devices, and as such, the dissipation co
...