ASTM D7962-15a
(Practice)Standard Practice for Determination of Minimum Immersion Depth and Assessment of Temperature Sensor Measurement Drift
Standard Practice for Determination of Minimum Immersion Depth and Assessment of Temperature Sensor Measurement Drift
SIGNIFICANCE AND USE
5.1 This practice provides a means for the users of ASTM Committee D02 standards to monitor the drift in sensed temperature of liquid-in-glass thermometer (LiG), and digital contact thermometers (DCT). Digital contact thermometers are sometimes referred to as portable electronic thermometers (PET) or simply digital thermometers.
5.2 This practice is not suitable for determining the accuracy or calibration of a temperature measuring device as the error in the ice bath temperature can be greater than 0.02 °C. For greater accuracy, the user should use Practice E563 to prepare the ice bath.
5.3 The ice point is a common practical industrial reference point of thermometry. The ice point is relatively simple to realize and provides a readily available natural fixed-point reference temperature.
5.4 This practice only checks the measurement drift at a single temperature. It will not detect a change in measurement response with change in temperature. Temperature measuring devices should be recalibrated at set intervals. See device supplier for recommendations.
5.5 This practice provides a technique to determine minimum immersion depth of the sensing probe of the thermometer using an ice bath. The minimum immersion depth determined by this practice may change when the differential temperature differs significantly from the conditions described. A greater differential will likely increase the minimum immersion depth.
SCOPE
1.1 This practice describes a two procedures for use with temperature measurement devices. Methodology is described for determining minimum immersion depth for thermal sensors, in particular RTDs or similar temperature sensors. Included is a procedure for consistently preparing a reference bath for the purpose of monitoring measurement drift of thermal sensors such as liquid-in-glass or digital contact thermometers.
1.2 This practice focuses on temperature measurement drift in a laboratory. If the user requires greater measurement accuracy, then they should follow the instructions in Practice E563.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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: D7962 − 15a
Standard Practice for
Determination of Minimum Immersion Depth and
1
Assessment of Temperature Sensor Measurement Drift
This standard is issued under the fixed designation D7962; 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* 3.1.1.1 Discussion—This device consists of a temperature
sensor connected to a measuring instrument; this instrument
1.1 This practice describes a two procedures for use with
measures the temperature-dependent quantity of the sensor,
temperature measurement devices. Methodology is described
computes the temperature from the measured quantity, and
for determining minimum immersion depth for thermal
provides a digital output. This digital output goes to a digital
sensors, in particular RTDs or similar temperature sensors.
displayand/orrecordingdevicethatmaybeinternalorexternal
Included is a procedure for consistently preparing a reference
to the device. These devices are sometimes referred to as a
bath for the purpose of monitoring measurement drift of
“digital thermometer”.
thermal sensors such as liquid-in-glass or digital contact
3.1.1.2 Discussion—Portable electronic thermometers
thermometers.
(PET) is an acronym sometimes used to refer to a subset of the
1.2 This practice focuses on temperature measurement drift
devices covered by this definition.
in a laboratory. If the user requires greater measurement
3.1.2 ice-point bath, n—physical system containing ice and
accuracy, then they should follow the instructions in Practice
water assembled to realize the ice point as a reference
E563.
temperature, or to establish a constant temperature near 0 °C.
1.3 The values stated in SI units are to be regarded as
3.1.3 minimum immersion length, n—depth that a thermom-
standard. No other units of measurement are included in this
eter should be immersed, in a uniform temperature
standard.
environment, such that further immersion does not produce a
change in indicated temperature greater than the specified
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the tolerance.
responsibility of the user of this standard to establish appro-
4. Summary of Practice
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4.1 This practice describes a procedure for consistently
preparing an ice bath that is an intimate mixture of crushed ice
2. Referenced Documents
or ice particles and water in a thermally insulating vessel open
2
2.1 ASTM Standards: to the atmosphere.
E563 Practice for Preparation and Use of an Ice-Point Bath
4.1.1 Caution—when the ice bath is not made from distilled
as a Reference Temperature water, its temperature will differ from the natural fixed-point
temperature by a consistent amount, typically less than
3. Terminology
0.02 °C. If the user needs a more accurate ice point, then they
3.1 Definitions: should use Practice E563 to prepare the ice bath.
3.1.1 digital contact thermometer (DCT), n—an electronic
4.2 This practice includes a procedure for determining the
device consisting of a digital display and associated tempera-
minimum immersion depth of the temperature sensor using an
ture sensing probe.
ice bath.
4.2.1 This procedure determines minimum immersion depth
1
with a 25 °C differential between sensed temperature and
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum
Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcom-
ambient temperature. If the probe is subjected to a greater
mittee D02.91 on Coordinating Subcommittee on Thermometry.
differential temperature, a larger immersion depth may be
Current edition approved Dec. 1, 2015. Published February 2016. Originally
required to correctly measure the temperature.
approved in 2015. Last previous edition approved in 2015 as D7962 – 15. DOI:
10.1520/D7962-15A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 5. Significance and Use
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1 This practice provides a means for the users of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Committee D02 standards to monitor the drift in sensed
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7962 − 15a
temperature of liquid-in-glass thermometer
...
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: D7962 − 15 D7962 − 15a
Standard Practice for
Determination of Minimum Immersion Depth and
1
Assessment of Temperature Sensor Measurement Drift
This standard is issued under the fixed designation D7962; 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 Scope*
1.1 This practice describes a two procedures for use with temperature measurement devices. Methodology is described for
determining minimum immersion depth for thermal sensors, in particular RTDs or similar temperature sensors. Included is a
procedure for consistently preparing a reference bath for the purpose of monitoring measurement drift of thermal sensors such as
liquid-in-glass or digital contact thermometers.
1.2 This practice focuses on temperature measurement drift in a laboratory. If the user requires greater measurement accuracy,
then they should follow the instructions in Practice E563.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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:
E563 Practice for Preparation and Use of an Ice-Point Bath as a Reference Temperature
3. Terminology
3.1 Definitions:
3.1.1 digital contact thermometer (DCT), n—an electronic device consisting of a digital display and associated temperature
sensing probe.
1
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.91 on Coordinating Subcommittee on Thermometry.
Current edition approved April 1, 2015Dec. 1, 2015. Published April 2015February 2016. Originally approved in 2015. Last previous edition approved in 2015 as
D7962 – 15. DOI: 10.1520/D7962-15.10.1520/D7962-15A.
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.
3.1.1.1 Discussion—
This device consists of a temperature sensor connected to a measuring instrument; this instrument measures the temperature-
dependent quantity of the sensor, computes the temperature from the measured quantity, and provides a digital output. This digital
output goes to a digital display and/or recording device that may be internal or external to the device. These devices are sometimes
referred to as a “digital thermometer”.
3.1.1.2 Discussion—
Portable electronic thermometers (PET) is an acronym sometimes used to refer to a subset of the devices covered by this definition.
3.1.2 ice-point bath, n—physical system containing ice and water assembled to realize the ice point as a reference temperature,
or to establish a constant temperature near 0 °C.
3.1.3 minimum immersion length, n—depth that a thermometer should be immersed, in a uniform temperature environment,
such that further immersion does not produce a change in indicated temperature greater than the specified tolerance.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7962 − 15a
4. Summary of Practice
4.1 This practice describes a procedure for consistently preparing an ice bath that is an intimate mixture of crushed ice or ice
particles and water in a thermally insulating vessel open to the atmosphere.
4.1.1 Caution—when the ice bath is not made from distilled water, its temperature will differ from the natural fixed-point
temperature by a consistent amount, typically less than 0.02 °C. If the user needs a more accurate ice point, then they should use
Practice E563 to prepare the ice bath.
4.2 This practice includes a procedure for determining the minimum immersion depth of the temperature sensor using an ice
bath.
4.2.1 This procedure determines minimum immersion depth with a 25 °C differential between sensed temperature and ambie
...
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