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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.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D5483 Test Method for Oxidation Induction Time of Lubricating Greases by Pressure Differential Scanning Calorimetry
D5720 Practice for Static Calibration of Electronic Transducer-Based Pressure Measurement Systems for Geotechnical Purposes
D5885 Test Method for Oxidative Induction Time of Polyolefin Geosynthetics by High-Pressure Differential Scanning Calorimetry
D6186 Test Method for Oxidation Induction Time of Lubricating Oils by Pressure Differential Scanning Calorimetry (PDSC)
E473 Terminology Relating to Thermal Analysis and Rheology
E537 Test Method for The Thermal Stability of Chemicals by Differential Scanning Calorimetry
E1142 Terminology Relating to Thermophysical Properties
E1782 Test Method for Determining Vapor Pressure by Thermal Analysis
E1858 Test Method for Determining Oxidation Induction Time of Hydrocarbons by Differential Scanning Calorimetry
E2009 Test Method for Oxidation Onset Temperature of Hydrocarbons by Differential Scanning Calorimetry
E2161 Terminology Relating to Performance Validation in Thermal Analysis
ICS Number Code 17.200.20 (Temperature-measuring instruments)
UNSPSC Code 41113009(Thermal differential analyzers)