ASTM E879-01(2007)

Standard Specification for Thermistor Sensors for Clinical 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 thermistor-type sensors 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.
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.

General Information

• Status: Historical
• Publication Date: 30-Apr-2007
• ICS: 17.200.20 - Temperature-measuring instruments
• Technical Committee: E20 - Temperature Measurement
• Drafting Committee: E20.03 - Resistance Thermometers

Relations

• Replaces: ASTM E879-01 - Standard Specification for Thermistor Sensors for Clinical Laboratory Temperature Measurements
• Effective Date: 01-May-2007
• Replaced By: ASTM E879-12 - Standard Specification for Thermistor Sensors for General Purpose and Laboratory Temperature Measurements
• Effective Date: 01-May-2012
• Referred By: ASTM D1525-17e1 - Standard Test Method for Vicat Softening Temperature of Plastics
• Effective Date: 01-May-2007
• Referred By: ASTM E344-20 - Terminology Relating to Thermometry and Hydrometry
• Effective Date: 01-May-2007
• Referred By: ASTM D2170/D2170M-22 - Standard Test Method for Kinematic Viscosity of Asphalts
• Effective Date: 01-May-2007
• Referred By: ASTM D2171/D2171M-22 - Standard Test Method for Viscosity of Asphalts by Vacuum Capillary Viscometer
• Effective Date: 01-May-2007
• Referred By: ASTM E2877-12(2019) - Standard Guide for Digital Contact Thermometers
• Effective Date: 01-May-2007
• Referred By: ASTM D70/D70M-21 - Standard Test Method for Specific Gravity and Density of Semi-Solid Asphalt Binder (Pycnometer Method)
• Effective Date: 01-May-2007

Standards Content (Sample)

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: E879 – 01 (Reapproved 2007)
Standard Specification for
Thermistor Sensors for Clinical 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 3.2.1 dissipation constant, d, 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
DP=P −P , to the resultant temperature change of the
2 1
negative temperature coefficient thermistor-type sensors in-
thermistor, DT=T −T .
tended to be used for clinical laboratory temperature measure- 2 1
mentsorcontrol,orboth,withintherangefrom−10to105°C. DP
d5 (1)
1.2 This specification also covers the detailed requirements DT
for ASTM designated sensors.
The dimensions of the dissipation constant are W/K.
1.3 This standard does not purport to address all of the
For this specification, T is in the range from 20 to 38 °C and
safety concerns, if any, associated with its use. It is the
DT=10 °C.
responsibility of the user of this standard to establish appro-
3.2.2 dumet, n—round, copper-coated 42% nickel-iron
priate safety and health practices and determine the applica-
wireintendedprimarilyforsealingtosoftglass.Alsoknownas
bility of regulatory limitations prior to use.
CuNiFe in some communities.
3.2.3 insulation resistance, dc, n—the resistance at a speci-
2. Referenced Documents
fied direct-current voltage between the insulated leads of a
2.1 ASTM Standards:
thermistor sensor and the metallic enclosure of the sensor, if
E344 Terminology Relating to Thermometry and Hydrom-
such an enclosure is present, or else between the sensor leads
etry
and a conductive medium in which the sensor is immersed.
E563 Practice for Preparation and Use of an Ice-Point Bath
3.2.4 qualificationtest,n—aseriesoftestsconductedbythe
as a Reference Temperature
procuring agency or an agent thereof to determine confor-
F29 Specification for Dumet Wire for Glass-to-Metal Seal
mance of thermistor sensors to the requirements of a specifi-
Applications
cation, normally for the development of a qualified products
list under the specification.
3. Terminology
3.2.5 response time, n—the time required for a sensor to
3.1 Definitions—The definitions given in Terminology
change a specified percentage of the total difference between
E344 shall apply to this specification.
its initial and final temperatures as determined from zero-
3.2 Definitions of Terms Specific to This Standard:
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
This specification is under the jurisdiction of ASTM Committee E20 on sensor that exhibits a single-exponential response.
Temperature Measurement and is the direct responsibility of Subcommittee E20.03
3.2.7 zero-power resistance, n—the dc resistance of a de-
on Resistance Thermometers.
vice, at a specified temperature, calculated for zero-power.
Current edition approved May 1, 2007. Published June 2007. Originally
3.2.7.1 Discussion—Accurate zero-power resistance is ob-
approved in 1982. Last previous edition approved in 2001 as E879–01. DOI:
10.1520/E0879-01R07.
tained by extrapolating to zero-power the resistance values
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
obtained from measurements at three or more levels of power
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
with the sensor immersed in a constant temperature medium.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. For the purpose of this specification, this is obtained from
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E879 – 01 (2007)
measurements at a single power level adjusted such that the tion constant specified in Table 1 (see 3.2.1 and 7.3) and the
power is not greater than one-fifth the product of the dissipa-
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 Application General Purpose Clinical General Purpose Clinical General Purpose Clinical General Purpose Clinical
Laboratory Temperature Laboratory Temperature Laboratory Temperature Laboratory Temperature
Measurement Measurement Measurement Measurement
Operating Temperature Range −10 to 60 °C −10 to 60 °C −10 to 60 °C −10 to 60 °C
Accuracy Class 1 (60.01 °C) 1 (60.01 °C) 2 (60.02 °C) 2 (60.02 °C)
Temperatures for Accuracy Class −10 to 60 °C −10 to 60 °C −10 to 60 °C −10 to 60 °C
Accuracies for other Temperatures
Within Specified Temperature
Range
Calibration Type Non-interchangeable Non-interchangeable Non-interchangeable Non-interchangeable
Nominal R-T Characteristic
R = exp[A + A /T + A /T +
0 1 2
A /T ] (T in kelvins)
T( °C) = [a +a LnR+a (LnR) +
0 1 2
3 −1
a (LnR) ] − 273.15
A −4.4495078 −4.4495078 −4.4495078 −4.4495078
A 3614.7764 3614.7764 3614.7764 3614.7764
A 88190.906 88190.906 88190.906 88190.906
A −22328247 −22328247 −22328247 −22328247
−2 −2 −2 −2
a 0.11766716 3 10 0.11766716 3 10 0.11766716 3 10 0.11766716 3 10
−3 −3 −3 −3
a 0.28173082 3 10 0.28173082 3 10 0.28173082 3 10 0.28173082 3 10
−5 −5 −5 −5
a −0.23285292 3 10 −0.23285292 3 10 −0.23285292 3 10 −0.23285292 3 10
−6 −6 −6 −6
a 0.24131652 3 10 0.24131652 3 10 0.24131652 3 10 0.24131652 3 10
Type of Immersion Fluid water, air water, oil, air water, air water, oil, air
Nominal R at 25 °C 2.5 kV 2.5 kV 2.5kV 2.5 kV
Dissipation Constant 3.5 6 0.9 mW/K 5.0 6 1.2 mW/K 3.56 0.9 mW/K 5.0 6 1.2 mW/K
63.2 % Response Time 0.55 6 0.16 s 0.45 6 0.11 s 0.55 6 0.16 s 0.45 6 0.11 s
Ratio of 95 % to 63.2 % Response 2.5 6 0.6 2.1 6 0.5 2.5 6 0.6 2.1 6 0.5
Times
Design and Construction Fig. 2 Fig. 3 Fig. 2 Fig. 3
ASTM No. E879 S A2N E879 E A2N E879 G B1N E879 H B1N
Description Silicone Rubber Coated Glass 5kV -4-Wire 5kV -2-Wire
Probe Non-interchangeable Sensor Non-interchangeable
Epoxy Coated Glass Probe
in S.S. Housing Sensor
in S.S. Housing
Major Application General Purpose Clinical General Purpose Clinical General Purpose Clinical General Purpose Clinical
Laboratory Temperature Laboratory Temperature Laboratory Temperature Laboratory Temperature
Measurement Measurement Measurement Measurement
Operating Temperature Range −10 to 105 °C −10 to 105 °C −10 to 60 °C −10 to 60 °C
Accuracy Class 2 (60.02 °C) 2 (60.02 °C) 1 (60.01 °C) 1 (60.01 °C)
Temperatures for Accuracy Class −10 to 105 °C −10 to 105 °C −10 to 60 °C −10 to 60 °C
Accuracies for other Temperatures
Within Specified Temperature
Range
Calibration Type Non-interchangeable Non-interchangeable Non-interchangeable Non-interchangeable
Nominal R-T Characteristic
R = exp[A + A /T + A /T +
0 1 2
A /T ]
T( °C) = [a +a LnR+a (LnR) +
0 1 2
3 −1
a (LnR) ] − 273.15
A −4.3332974 −4.3332947 −3.7563605 −3.7563605
A 4440.1603 4440.1603 3614.7764 3614.7764
A −104525.78 −104525.78 88190.906 88190.906
−4581329.78 −4581329.78 −22328247 −22328247
A
−3 −3 −3 −3
a 0.98667965 3 10 0.98667965 3 10 0.98019160 3 10 0.98019160 3 10
−3 −3 −3 −3
a 0.24329879 3 10 0.24329879 3 10 0.28530667 3 10 0.28530667 3 10
−6 −6 −5 −5
a −0.59584872 3 10 −0.59584872 3 10 −0.28303328 3 10 −0.28303328 3 10
−7 −7 −6 −6
a 0.97166167 3 10 0.97166167 3 10 0.24131652 3 10 0.24131652 3 10
Type of Immersion Fluid water, air water, air all fluids compatible with Type all fluids compatible with
304 S.S. Type 304 S.S.
R at 25 °C 10kV 10 kV 5 kV 5 kV
Dissipation Constant 3.5 6 0.9 mW/K 5.0 6 1.2 mW/K 4.86 1.2 mW/K 4.8 6 1.2 mW/K
63.2 % Response Time 0.55 6 0.16 s 0.45 6 0.11 s 4.5 6 1.1 s 4.5 6 1.1 s
Ratio of 95 % to 63.2 % Response 2.5 6 0.6 2.1 6 0.5 2.6 6 0.3 2.6 6 0.3
Times
Design and Construction Fig. 2 Fig. 3 Fig. 4 Fig. 5
E879 – 01 (2007)
TABLE 1 (continued)
ASTM No. E879 G B1N E879 H B1N E879 G A2N E879 H A2N
Description 10 kV 4-Wire Non- 10 kV 2-Wire Non- 10 kV 4-Wire Non- 10 kV 2-Wire Non-
interchangeable Sensor in interchangeable Sensor in interchangeable Sensor in interchangeable Sensor in
S.S. Housing S.S. Housing S.S. Housing S.S. Housing
Major Application General Purpose Clinical General Purpose Clinical General Purpose Clinical General Purpose Clinical
Laboratory Temperature Laboratory Temperature Laboratory Temperature Laboratory Temperature
Measurement Measurement Measurement Measurement
Operating Temperature Range −10 to 60 °C −10 to 60 °C −10 to 105 °C −10 to 105 °C
Accuracy Class 1 (60.01 °C) 1 (60.01 °C) 2 (60.02 °C) 2 (60.02 °C)
Temperatures for Accuracy −10 to 60 °C −10 to 60 °C −10 to 105 °C −10 to 105 °C
Class
Accuracies for other
Temperatures
Within Specified Temperature
Range
Calibration Type Non-interchangeable Non-interchangeable Non-interchangeable Non-interchangeable
Nominal R-T Characteristic
R = exp[A + A /T + A /T +
0 1 2
A /T ]
T(
°C) = [a +a LnR+a (LnR) +
0 1 2
3 −1
a (LnR) ] − 273.15
A −3.5684919 −3.5684919 −3.7191520 −3.7191520
A 3907.7065 3907.7065 4045.1666 4045.1666
A 33480.382 33480.382 −8181.7100 -8181.7100
A −18666997 −18666997 −14472122 −14472122
−3 −3 −3 −3
a 0.86972495 3 10 0.86972495 3 10 0.89898144 3 10 0.89898144 3 10
−3 −3 −3 −3
a 0.27135335 3 10 0.27135335 3 10 0.26152805 3 10 0.26152805 3 10
−5 −5 −6 −6
a −0.20689100 3 10 −0.20689100 3 10 −0.97537969 3 10 −0.97537969 3 10
−6 −6 −6 −6
a 0.20547429 3 10 0.20547429 3 10 0.16613292 3 10 0.16613292 3 10
Type of Immersion Fluid all fluids compatible with Type all fluids compatible with Type all fluids compatible with Type all fluids compatible with Type
304 S.S. 304 S.S. 304 S.S. 304 S.S.
Nominal R at 25 °C 10 kV 10kV 10 kV 10 kV
Dissipation Constant 4.8 6 1.2 mW/K 4.8 6 1.2 mW/K 4.86 1.2 mW/K 4.8 6 1.2 mW/K
63.2 % Response Time 4.5 6 1.1 s 4.5 6 1.1 s 4.56 1.1 s 4.5 6 1.1 s
Ratio of 95 % to 63.2 % 2.6 6 0.3 2.6 6 0.3 2.6 6 0.3 2.6 6 0.3
Response
Times
Design and Construction Fig. 4 Fig. 5 Fig. 4 Fig. 5
ASTM No. E879 V B3I E879 W B3N
Description Interchangeable Sensor Non-interchangeable Sensor
Enclosed in 1.17 mm Plastic Enclosed in 0.92 mm Plastic
Tube Tube
Major Application Cuvette Thermometry Cuvette Thermometry
Operating Temperature Range −10 to 60 °C −10 to 60 °C
Accuracy Class 3 (60.05 °C) 3 (60.05 °C)
Temperatures for Accuracy 24 to 45 °C −10 to 60 °C
Class
Accuracies for other −10 to 24 °C: 60.1 °C
Temperatures 45 to 60 °C: 60.1 °C
Within Specified Temperature
Range
Calibration Type Interchangeable Non-interchangeable
Nominal R-T Characteristic
R = exp[A + A /T + A /T +
0 1 2
A /T ]
T(
°C) = [a +a LnR+a (LnR) +
0 1 2
3 −1
a (LnR) ] − 273.15
A −3.1645305 −3.0612396
A 3763.4399 3613.0051
A 47816.278 88718.122
A −18332303 −22380305
−3 −3
a 0.78686094 3 10 0.78069589 3 10
−3 −3
a 0.28128740 3 10 0.28967541 3 10
−5 −5
a −0.25226292 3 10 −0.38427027 3 10
−6 −6
a 0.20852922 3 10 0.24169639 3 10
Type of Immersion Fluid water water
Nominal R at 25 °C 11 kV 10 kV
Dissipation Constant 1.1 6 0.3 mW/K 0.8 6 0.2 mW/K
63.2 % Response Time 0.5 6 0.12 s 0.26 6 0.06 s
Ratio of 95 % to 63.2 % 3.0 6 0.3 3 6 0.3
Response
Times
Design and Construction Fig. 6 Fig. 7
E879 – 01 (2007)
appropriate tolerance requirement of Table 2. When making can be obtained from that relationship and have an uncertainty
stability measurements, the power shall be kept constant. no greater than one-tenth the specified tolerance in Table 2.
When tested in accordance with 7.2, the zero-power resistance
4. Classification
versus temperature relationship for interchangeable parts shall
4.1 Thermistorsensorscoveredbythisspecificationshallbe comply to within the tolerance specified in Table 2. The
classifiedwithatypedesignationcodethatincludestheASTM
manufacturerofthesensorshall,fornon-interchangeableparts,
detailed specification number followed by a descriptive code. supply this relationship with each part shipped.
See Fig. 1.
5.2.1 Accuracy—The resistance-temperature relationship,
4.2 ASTM Specification Number—The ASTM specification
provided inTable 1, or with the sensor, or both, shall not differ
number specifies uniquely the design and construction of the
from that obtained from measurements made in accordance
sensor including the type designation if more than one type
with7.2bymorethanthetolerancesspecifiedinTable2forthe
appears in the same specification.
applicable intervals specified in Table 1.
4.2.1 Type Designation—The type designation shall be a
5.3 Thermal Requirements:
letter symbol to indicate the design and construction of the
5.3.1 Dissipation Constant—When tested in accordance
thermistor sensor.
with 7.3, the dissipation constant shall be as specified in the
4.2.1.1 Type S—Silicone rubber-coated glass probe with
detailed specification.
tinned Dumet extension leads (see Fig. 2).
5.3.2 Response Time—When tested in accordance with 7.4,
4.2.1.2 Type E—Epoxy-coated glass probe with silver-
theresponsetimeortimeconstant,orboth,shallbeasspecified
plated copper extension leads (see Fig. 3).
in the detailed specification.
4.2.1.3 Type G—General purpose four wire sensor in stain-
5.4 Environmental Requirements:
less steel housing (see Fig. 4).
5.4.1 Operating Temperature Range—The operating tem-
4.2.1.4 Type H—General purpose two-wire sensor in stain-
peraturerangeshallbeasspecifiedinthetypedesignationcode
less steel housing (see Fig. 5).
(see 4.1 and 4.3).
4.2.1.5 TypeV—Interchangeablesensorenclosedin1.2-mm
5.4.2 Storage Temperature Range—Sensors shall be ca-
vinyl tube (see Fig. 6).
pable of meeting all requirements specified herein as well as
4.2.1.6 Type W—Non-interchangeable sensor enclosed in
thoselistedintheapplicabledetailedspecificationafterstorage
0.9-mm vinyl tube (see Fig. 7).
at any temperature (or combination thereof) in the range
4.3 OperatingTemperatureRange—Theoperatingtempera-
from−40 to 60 °C for a period of 1 year.
ture range shall be designated by a letter symbol (seeTable 3).
5.4.3 Humidity Requirement—Sensors shall be capable of
4.4 AccuracyClass—Theaccuracyclassshallbedesignated
being operated or stored at relative humidity from 0 to 95%
by a single-digit number (see Table 2).
without condensation.
4.5 Calibration Type—The type of calibration required for
each unit shall be designated by a letter symbol. The letter I
5.5
...