ASTM E879-01(2007)
(Specification)Standard Specification for Thermistor Sensors for Clinical Laboratory Temperature Measurements
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.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: E879 – 01 (Reapproved 2007)
Standard Specification for
Thermistor Sensors for Clinical Laboratory Temperature
1
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
1
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
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
1
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
2
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 service@astm.org. 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.
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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
O
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