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ASTM E2744-10

(Test Method)

Standard Test Method for Pressure Calibration of Thermal Analyzers

Standard Test Method for Pressure Calibration of Thermal Analyzers

SIGNIFICANCE AND USE
Most thermal analysis experiments are conducted under ambient pressure conditions using isothermal or temperature time rate of change conditions where time or temperature is the independent parameter. Some experiments, however, are conducted under reduced or elevated pressure conditions where pressure is an independent experimental parameter (Test Method E537). Oxidation Induction Times (Test Methods D5483, D5885, D6186, and E1858), Oxidation Onset Temperature (Test Method E2009), and the Vapor Pressure (Test Method E1782) are other examples of experiments conducted under elevated or reduced pressure (vacuum) conditions. Since in these cases pressure is an independent variable, the measurement system for this parameter shall be calibrated to ensure interlaboratory reproducibility.
The dependence of experimental results on pressure is usually logarithmic rather than linear.
SCOPE
1.1 This test method describes the calibration or performance confirmation of the electronic pressure signals from thermal analysis apparatus.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 There is no ISO standard equivalent to this test method.
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.

General Information

Status
Historical
Publication Date
14-Mar-2010
ICS
17.200.20 - Temperature-measuring instruments
Technical Committee
E37 - Thermal Measurements
Drafting Committee
E37.10 - Fundamental, Statistical and Mechanical Properties
Current Stage
Ref Project

Relations

Replaced By
ASTM E2744-10(2015) - Standard Test Method for Pressure Calibration of Thermal Analyzers
Effective Date
01-Mar-2015
Referred By
ASTM E1142-23a - Standard Terminology Relating to Thermophysical Properties
Effective Date
15-Mar-2010

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ASTM E2744-10 - Standard Test Method for Pressure Calibration of Thermal AnalyzersASTM E2744-10 - Standard Test Method for Pressure Calibration of Thermal Analyzers
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ASTM E2744-10 - Standard Test Method for Pressure Calibration of Thermal Analyzers
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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: E2744 − 10
StandardTest Method for
Pressure Calibration of Thermal Analyzers
This standard is issued under the fixed designation E2744; 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 E1782 Test Method for Determining Vapor Pressure by
Thermal Analysis
1.1 This test method describes the calibration or perfor-
E1858 Test Method for Determining Oxidation Induction
mance confirmation of the electronic pressure signals from
Time of Hydrocarbons by Differential Scanning Calorim-
thermal analysis apparatus.
etry
1.2 The values stated in SI units are to be regarded as
E2009 Test Methods for Oxidation Onset Temperature of
standard. No other units of measurement are included in this
Hydrocarbons by Differential Scanning Calorimetry
standard.
E2161 Terminology Relating to Performance Validation in
1.3 There is no ISO standard equivalent to this test method. Thermal Analysis
1.4 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1 Definitions:
priate safety and health practices and determine the applica-
3.1.1 The technical terms used in this test method are
bility of regulatory limitations prior to use. defined in Terminologies E473, E1142, and E2161, including
calibration, Celsius, differential scanning calorimetry, high
2. Referenced Documents pressure, linearity, oxidative induction time, thermal analysis,
2 and vapor pressure.
2.1 ASTM Standards:
D5483 Test Method for Oxidation Induction Time of Lubri- 3.2 Definitions of Terms Specific to This Standard:
catingGreasesbyPressureDifferentialScanningCalorim- 3.2.1 absolute pressure, n—pressure measured relative to
etry zero pressure corresponding to empty space.
D6186 Test Method for Oxidation Induction Time of Lubri- 3.2.1.1 Discussion—Absolute pressure is atmospheric pres-
cating Oils by Pressure Differential Scanning Calorimetry sure plus gage pressure.
(PDSC)
3.2.2 atmospheric pressure, n—the pressure due to the
D5720 Practice for Static Calibration of Electronic
weight of the atmosphere.
Transducer-Based Pressure Measurement Systems for
3.2.2.1 Discussion—Atmospheric pressure varies with el-
Geotechnical Purposes
evation above sea level, acceleration due to gravity and
D5885 Test Method for Oxidative Induction Time of Poly-
weather conditions. Standard atmospheric pressure is
olefin Geosynthetics by High-Pressure Differential Scan-
101.325 kPa.
ning Calorimetry
3.2.3 barometer, n—an instrument for measuring atmo-
E473 Terminology Relating to Thermal Analysis and Rhe-
spheric pressure.
ology
3.2.4 gage pressure, n—pressure measured relative to atmo-
E537 Test Method for The Thermal Stability of Chemicals
spheric pressure.
by Differential Scanning Calorimetry
3.2.4.1 Discussion—Zero gage pressure is equal to atmo-
E1142 Terminology Relating to Thermophysical Properties
spheric pressure. Gage pressure is the difference between
absolute pressure and atmospheric pressure.
3.2.5 pressure, n—the force exerted to a surface per unit
ThistestmethodisunderthejurisdictionofASTMCommitteeE37onThermal
area.
Measurements and is the direct responsibility of Subcommittee E37.10 on
Fundamental, Statistical and Mechanical Properties.
3.2.6 vacuum, n—pressure less than atmospheric pressure.
Current edition approved March 15, 2010. Published August 2010. DOI:101520/
E2744-10.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 4. Summary of Test Method
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.1 The pressure (vacuum) signal generated by a thermal
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. analyzer is compared to a gage whose performance is known
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E2744 − 10
and traceable to a national metrology institute. The thermal pressure. Pressure relief shall be provided at pressures no
analyzer may be said to be in conformance if the performance greater than 1.2 times the maximum allowable working pres-
is within established limits. Alternately, the pressure signal sure.
may be calibrated using a two-point calibration method.
8. Preparation of Apparatus
5. Significance and Use 8.1 Assemble the apparatus so that the calibration pressure
gageisconnectedinparallelwiththepressuretransducerofthe
5.1 Most thermal analysis experiments are conducted under
apparatus.Thatis,theinstrumenttransducerandthecalibration
ambient pressure conditions using isothermal or temperature
gage shall see the same static pressure (see Fig. 1). Equilibrate
timerateofchangeconditionswheretimeortemperatureisthe
the thermal analysis apparatus pressure container, reference
independent parameter. Some experiments, however, are con-
pressure gage and instrument transducer at ambient tempera-
ducted under reduced or elevated pressure conditions where
ture.
pressure is an independent experimental parameter (Test
Method E537). Oxidation Induction Times (Test Methods
9. Calibration
D5483, D5885, D6186, and E1858), Oxidation Onset Tem-
9.1 Perform any pressure signal calibration procedures rec-
perature (Test Method E2009), and the Vapor Pressure (Test
ommended by the manufacturer of the thermal analyzer as
Method E1782) are other examples of experiments conducted
described in the Operator’s Manual.
under elevated or reduced pressure (vacuum) conditions. Since
in these cases pressure is an independent variable, the mea-
10. Procedure
surementsystemforthisparametershallbecalibratedtoensure
10.1 Electronic pressure signals associated with thermal
interlaboratory reproducibility.
analysis apparatus measure gage pressure relative to atmo-
5.2 The dependence of experimental results on pressure is
spheric pressure. However, absolute pressure is most often
usually logarithmic rather than linear.
required for thermal analysis experiments.Absolute pressure is
the sum of gage pressure and atmospheric pressure. So
6. Apparatus
knowledge of atmospheric pressure is required to obtain
absolute pressure.
6.1 Reference pressure gage with a range 1.2 times the
maximumvaluetobecalibratedreadabletowithin0.1 %ofthe
10.2 Using a laboratory barometer, measure and record the
full range and performance of which has been verified using
atmospheric pressure (Patm) within one hour of the pressure
standards and procedures traceable to a national metrology
calibration in steps 10.4 – 10.6.
institute (such as the National Institute of Standards and
NOTE 5—Should a laboratory barometer be unavailable, local pressure
Technology (NIST)).
may often be obtained by contacting the local weather service. This
approach is not suitable for laboratories operating under negative gage
NOTE 1—To ensure an accurate pressure measurement, the reference
pressure.
pressure gage shall be placed as close as practical to the thermal analysis
10.3 Assemble the instrument to be calibrated, the reference
apparatus to be calibrated and connected to the thermal analysis apparatus
with large diameter tubing such as 6.3 mm or larger especially for vacuum
pressu
...

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