ASTM E2488-09(2014)

Standard Guide for the Preparation and Evaluation of Liquid Baths Used for Temperature Calibration by Comparison

SIGNIFICANCE AND USE
5.1 The design of a controlled temperature bath will determine what thermometers can be calibrated and to what extent an isothermal condition is achieved. The lack of thermal stability and uniformity of the bath are sources of error that contribute to the overall calibration uncertainty.  
5.2 This guide describes a procedure for determining the effective working space for a controlled temperature fluid bath.  
5.3 This guide describes a procedure for determining the thermal stability within a controlled temperature fluid bath. Overall thermal stability is composed of the bath performance as specified by the manufacturer of the bath equipment and as a component of calibration uncertainty.  
5.4 This guide describes a procedure for determining the temperature uniformity of the working space of the controlled temperature fluid bath.
SCOPE
1.1 This guide is intended for use with controlled temperature comparison baths that contain test fluids and operate within the temperature range of –100°C to 550°C.  
1.2 This guide describes the essential features of controlled temperature fluid baths used for the purpose of thermometer calibration by the comparison method.  
1.3 This guide does not address the details on the design and construction of controlled-temperature fluid baths.  
1.4 This guide describes a method to define the working space of a bath and evaluate the temperature variations within this space. Ideally, the working space will be as close as possible to isothermal.  
1.5 This guide does not address fixed point baths, ice point baths or vapor baths.  
1.6 This guide does not address fluidized powder baths.  
1.7 This guide does not address baths that are programmed to change temperature.  
1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.9 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-Nov-2014
• ICS: 17.200.20 - Temperature-measuring instruments
• Technical Committee: E20 - Temperature Measurement
• Drafting Committee: E20.07 - Fundamentals in Thermometry

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: E2488 − 09 (Reapproved 2014)
Standard Guide for
the Preparation and Evaluation of Liquid Baths Used for
1
Temperature Calibration by Comparison
This standard is issued under the fixed designation E2488; 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.
INTRODUCTION
Many of the Standards and Test Methods under the jurisdiction of ASTM committee E20 on
Temperature Measurement make reference to the use of controlled temperature fluid baths for the
calibration of thermometers by the comparison method. In this method the thermometer under test is
measured while immersed in an isothermal medium whose temperature is simultaneously determined
by a calibrated reference thermometer. The uncertainty of all such comparison calibrations depends
upon how well the isothermal conditions can be maintained.The bath temperature must be stable over
time and uniform within the working space at the operating temperatures. This guide provides basic
information, options and instructions that will enable the user to prepare and evaluate controlled
temperature baths for calibrations.
1. Scope 1.9 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This guide is intended for use with controlled tempera-
responsibility of the user of this standard to establish appro-
ture comparison baths that contain test fluids and operate
priate safety and health practices and determine the applica-
within the temperature range of –100°C to 550°C.
bility of regulatory limitations prior to use.
1.2 This guide describes the essential features of controlled
temperature fluid baths used for the purpose of thermometer
2. Referenced Documents
calibration by the comparison method.
2
2.1 ASTM Standards:
1.3 Thisguidedoesnotaddressthedetailsonthedesignand
E1 Specification for ASTM Liquid-in-Glass Thermometers
construction of controlled-temperature fluid baths.
E344 Terminology Relating to Thermometry and Hydrom-
etry
1.4 This guide describes a method to define the working
E644 Test Methods for Testing Industrial Resistance Ther-
space of a bath and evaluate the temperature variations within
mometers
this space. Ideally, the working space will be as close as
E839 Test Methods for Sheathed Thermocouples and
possible to isothermal.
Sheathed Thermocouple Cable
1.5 This guide does not address fixed point baths, ice point
2.2 Other Documents:
baths or vapor baths.
3
ITS-90 The International Temperature Scale of 1990
1.6 This guide does not address fluidized powder baths.
4
NIST Monograph 126 Platinum Resistance Thermometry
4
1.7 This guide does not address baths that are programmed
NIST Monograph 150 Liquid-in-Glass Thermometry
to change temperature.
NIST SP250-22 Platinum Resistance Thermometer Calibra-
4
tions
1.8 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
standard.
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
1
This guide is under the jurisdiction of ASTM Committee E20 on Temperature the ASTM website.
3
Measurement and is the direct responsibility of Subcommittee E20.07 on Funda- Preston-Thomas, H., METROLOGIA, Vol. 27, 1990, pp 3-10 and 107 (errata).
mentals in Thermometry. Mangum, B. W., JOURNAL OF RESEARCH, National Institute of Standards and
Current edition approved Dec. 1, 2014. Published December 2014. Originally Technology, Vol 95, 1990 , p. 69.
4
approved in 2009. Last previous edition approved in 2009 as E2488 – 09. DOI: Available from National Institute of Standards and Technology (NIST), 100
10.1520/E2488-09R14. Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E2488 − 09 (2014)
NIST SP 250-23 Liquid-in-Glass Thermometer Calibration 5.4 This guide describes a procedure for determining the
4
Service temperature uniformity of the working space of the controlled
temperature fluid bath.
2.3 Military Standards:
MIL-STD-202G Test Methods for Electronic and Electrical
5
Component Parts 6. Procedure
6.1 Bath System—A controlled temperature fluid bath sys-
3. Terminology
tem will incorporate most, if not all, of the following compo-
3.1 Standard terms used in this guide are defined in Termi-
nents: a fluid medium; a mechanical design that prov
...

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: E2488 − 09 E2488 − 09 (Reapproved 2014)
Standard Guide for
the Preparation and Evaluation of Liquid Baths Used for
1
Temperature Calibration by Comparison
This standard is issued under the fixed designation E2488; 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.
INTRODUCTION
Many of the Standards and Test Methods under the jurisdiction of ASTM committee E20E20 on
Temperature Measurement make reference to the use of controlled temperature fluid baths for the
calibration of thermometers by the comparison method. In this method the thermometer under test is
measured while immersed in an isothermal medium whose temperature is simultaneously determined
by a calibrated reference thermometer. The uncertainty of all such comparison calibrations depends
upon how well the isothermal conditions can be maintained. The bath temperature must be stable over
time and uniform within the working space at the operating temperatures. This guide provides basic
information, options and instructions that will enable the user to prepare and evaluate controlled
temperature baths for calibrations.
1. Scope
1.1 This guide is intended for use with controlled temperature comparison baths that contain test fluids and operate within the
temperature range of –100°C to 550°C.
1.2 This guide describes the essential features of controlled temperature fluid baths used for the purpose of thermometer
calibration by the comparison method.
1.3 This guide does not address the details on the design and construction of controlled-temperature fluid baths.
1.4 This guide describes a method to define the working space of a bath and evaluate the temperature variations within this
space. Ideally, the working space will be as close as possible to isothermal.
1.5 This guide does not address fixed point baths, ice point baths or vapor baths.
1.6 This guide does not address fluidized powder baths.
1.7 This guide does not address baths that are programmed to change temperature.
1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.9 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:
E1 Specification for ASTM Liquid-in-Glass Thermometers
E344 Terminology Relating to Thermometry and Hydrometry
E644 Test Methods for Testing Industrial Resistance Thermometers
E839 Test Methods for Sheathed Thermocouples and Sheathed Thermocouple Cable
1
This practiceguide is under the jurisdiction of ASTM Committee E20 on Temperature Measurement and is the direct responsibility of Subcommittee E20.07 on
Fundamentals in Thermometry.
Current edition approved Nov. 1, 2009Dec. 1, 2014. Published February 2010December 2014. Originally approved in 2009. Last previous edition approved in 2009 as
E2488 – 09. DOI: 10.1520/E2488-09.10.1520/E2488-09R14.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E2488 − 09 (2014)
2.2 Other Documents:
3
ITS-90 The International Temperature Scale of 1990
4
NIST Monograph 126 Platinum Resistance Thermometry
4
NIST Monograph 150 Liquid-in-Glass Thermometry
4
NIST SP 250-22 Platinum Resistance Thermometer Calibrations
4
NIST SP 250-23 Liquid-in-Glass Thermometer Calibration Service
2.3 Military Standards:
5
MIL-STD-202G Test Methods for Electronic and Electrical Component Parts
3. Terminology
3.1 Standard terms used in this guide are defined in Terminology E344.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 bath gradient error, n—the error caused by temperature differences within the working space of the bath.
3.2.2 immersion error, n—an error caused by heat conduction, radiation or both between the temperature sensing portion of the
sensor used in t
...