ASTM E879-12
(Specification)Standard Specification for Thermistor Sensors for General Purpose and Laboratory Temperature Measurements
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 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 to +150°C.
1.4 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:E879 −12
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 3.2.1 dissipation constant, δ,n—the ratio of the change in
energy dissipated per unit time (power) in a thermistor,
1.1 This specification covers the general requirements for
∆P=P − P , to the resultant temperature change of the
2 1
Negative Temperature Coefficient (NTC) thermistor-type sen-
thermistor, ∆T=T −T .
2 1
sors intended to be used for laboratory temperature measure-
ments or control, or both, within the range from−10 to 105°C. ∆P
δ 5 (1)
∆T
1.2 This specification also covers the detailed requirements
for ASTM designated sensors.
The dimensions of the dissipation constant are W/K.
For this specification, T is in the range from 20 to 38°C and
1.3 This specification also covers the requirements for
1
∆T=10°C.
general purpose, Negative Temperature Coefficient (NTC)
thermistor-type sensors intended for use with Digital Contact
3.2.2 dumet,n—round,copper-coated42%nickel-ironwire
Thermometers (also known as Digital Thermometers) within
intended primarily for sealing to soft glass. Also known as
the range from –50 to +150°C.
CuNiFe in some communities.
1.4 This standard does not purport to address all of the
3.2.3 insulation resistance, dc, n—the resistance at a speci-
safety concerns, if any, associated with its use. It is the
fied direct-current voltage between the insulated leads of a
responsibility of the user of this standard to establish appro-
thermistor sensor and the metallic enclosure of the sensor, if
priate safety and health practices and determine the applica-
such an enclosure is present, or else between the sensor leads
bility of regulatory limitations prior to use.
and a conductive medium in which the sensor is immersed.
2. Referenced Documents 3.2.4 qualificationtest,n—aseriesoftestsconductedbythe
2
procuring agency or an agent thereof to determine confor-
2.1 ASTM Standards:
mance of thermistor sensors to the requirements of a
E344Terminology Relating to Thermometry and Hydrom-
specification, normally for the development of a qualified
etry
products list under the specification.
E563Practice for Preparation and Use of an Ice-Point Bath
as a Reference Temperature
3.2.5 response time, n—the time required for a sensor to
F29Specification for Dumet Wire for Glass-to-Metal Seal
change a specified percentage of the total difference between
Applications
its initial and final temperatures as determined from zero-
power resistances when the sensor is subjected to a step
3. Terminology
function change in temperature.
3.1 Definitions—The definitions given in Terminology
3.2.6 timeconstant,n—the63.2%responsetimeofasensor
E344 shall apply to this specification.
that exhibits a single-exponential response.
3.2 Definitions of Terms Specific to This Standard:
3.2.7 zero-power resistance, n—the dc resistance of a
device, at a specified temperature, calculated for zero-power.
1
This specification is under the jurisdiction of ASTM Committee E20 on 3.2.7.1 Discussion—Accurate zero-power resistance is ob-
Temperature Measurement and is the direct responsibility of Subcommittee E20.03
tained by extrapolating to zero-power the resistance values
on Resistance Thermometers.
obtained from measurements at three or more levels of power
Current edition approved May 1, 2012. Published June 2012. Originally
with the sensor immersed in a constant temperature medium.
approved in 1982. Last previous edition approved in 2007 as E879–01 (2007).
DOI: 10.1520/E0879-01R07.
For the purpose of this specification, this is obtained from
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
measurements at a single power level adjusted such that the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
power is not greater than one-fifth the product of the dissipa-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tion constant specified in Table 1 (see 3.2.1 and 7.3) and the
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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E879−12
TABLE 1 Specification for ASTM Clinical Laboratory Thermistor Sensors
ASTM No. E879 S B1N E879 E B1N E879 S B2N E879 E B2N
Description Silicone Rubber Coated Glass Epoxy Coated Glass Probe Silicone Rubber Coated Glass Epoxy Coated Glass Probe
Probe Probe
Major Applicati
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:E879–01 (Reapproved 2007) Designation: E879 – 12
Standard Specification for
Thermistor Sensors for Clinical Laboratory Temperature
MeasurementsThermistor Sensors for General Purpose and
1
Laboratory 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
1.1 ThisspecificationcoversthegeneralrequirementsfornNegativetTemperaturecCoefficient(NTC)thermistor-typesensors
intended to be used for clinical laboratory temperature measurements or control, or both, within the range from−10 to 105°C.
1.2 This specification also covers the detailed requirements for ASTM designated sensors.
1.3
1.3 This specification also covers the requirements for general purpose, Negative Temperature Coefficient (NTC) thermistor-
typesensorsintendedforusewithDigitalContactThermometers(alsoknownasDigitalThermometers)withintherangefrom–50
to +150°C.
1.4 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
F29 Specification for Dumet Wire for Glass-to-Metal Seal Applications
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, d, n—the ratio of the change in energy dissipated per unit time (power) in a thermistor, DP=P −
2
P , to the resultant temperature change of the thermistor, DT=T −T .
1 2 1
DP
d5 (1)
DT
E0879-12_1
The dimensions of the dissipation constant are W/K.
For this specification, T is in the range from 20 to 38°C and DT=10°C.
1
3.2.2 dumet,n—round,copper-coated42%nickel-ironwireintendedprimarilyforsealingtosoftglass.AlsoknownasCuNiFe
in some communities.
3.2.3 insulationresistance,dc,n—theresistanceataspecifieddirect-currentvoltagebetweentheinsulatedleadsofathermistor
sensor and the metallic enclosure of the sensor, if such an enclosure is present, or else between the sensor leads and a conductive
medium in which the sensor is immersed.
3.2.4 qualification test, n—a series of tests conducted by the procuring agency or an agent thereof to determine conformance
of thermistor sensors to the requirements of a specification, normally for the development of a qualified products list under the
specification.
3.2.5 response time, n—thetimerequiredforasensortochangeaspecifiedpercentageofthetotaldifferencebetweenitsinitial
1
ThisspecificationisunderthejurisdictionofASTMCommitteeE20onTemperatureMeasurementandisthedirectresponsibilityofSubcommitteeE20.03onResistance
Thermometers.
Current edition approved May 1, 2007.2012. Published June 2007.2012. Originally approved in 1982. Last previous edition approved in 20012007 as E879–01 (2007).
DOI: 10.1520/E0879-01R07.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.ForAnnualBookofASTMStandards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
E879 – 12
and final temperatures as determined from zero-power resistances when the sensor is subjected to a step function change in
temperature.
3.2.6 time constant, n—the 63.2% response time of a sensor that exhibits a single-exponential response.
3.2.7 zero-power resistance, n—the dc resistance of a device, at a specified temperature, calculated for zero-power.
3.2.7.1 Discussion—Accurate zero-power resistance is obtained by extrapolating to zero-power the resistance values obtained
frommeasurementsatthreeormorelevelsofpowerwiththesensorimmersedinaconstanttemperaturemedium.Forthepurpose
of this specification, this is obtained from measurements at a single power level adjusted such that the power is not greater than
one-fifth the product of the dissipation constant specified in Table 1 (see
...
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 − 12
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 −10 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
to +150°C.
1.4 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
F29 Specification for Dumet Wire for Glass-to-Metal Seal Applications
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.
For this specification, T is in the range from 20 to 38°C and ΔT = 10°C.
1
3.2.2 dumet, n—round, copper-coated 42 % nickel-iron wire intended primarily for sealing to soft glass. Also known as CuNiFe
in some communities.
3.2.3 insulation resistance, dc, n—the resistance at a specified direct-current voltage between the insulated leads of a thermistor
sensor and the metallic enclosure of the sensor, if such an enclosure is present, or else between the sensor leads and a conductive
medium in which the sensor is immersed.
3.2.4 qualification test, n—a series of tests conducted by the procuring agency or an agent thereof to determine conformance
of thermistor sensors to the requirements of a specification, normally for the development of a qualified products list under the
specification.
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, 2012. Published June 2012. Originally approved in 1982. Last previous edition approved in 2007 as E879 – 01 (2007). DOI:
10.1520/E0879-01R07.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E879 − 12
3.2.5 response time, n—the time required for a sensor to change a specified percentage of the total difference between its initial
and final temperatures as determined from zero-power resistances when the sensor is subjected to a step function change in
temperature.
3.2.6 time constant, n—the 63.2 % response time of a sensor that exhibits a single-exponential response.
3.2.7 zero-power resistance, n—the dc resistance of a device, at a specified temperature, calculated for zero-power.
3.2.7.1 Discussion—
Accurate zero-power resistance is obtained by extrapolating to zero-power the resistance values obtained from measurements at
three or more levels of power with the sensor immersed in a constant temperature medium. For the purpose of this specification,
this is obtained from measurements at a single power level adjusted such that the power is not greater than one-fifth the product
of the dissipation constant sp
...
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