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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
13. Calibration13.1 Prepare the gas chromatograph for use as directed by the manufacturer, and establish a set of operating conditions capable of separation of the indicated component gases.13.2 Inject a pre-established volume of the reference standard gas mixture into the chromatograph and establish ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
12. Reagent and Materials12.1 Purity of Reagents - Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where such specifications are ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
GAS ANALYSIS11. Apparatus11.1 Gas Chromatograph, consisting essentially of a carrier gas source, a pressure regulator, a sample injection port and chromatography column(s), flow meter(s), detector(s), and recorder(s) or recording integrator(s).11.2 Provide means for measuring and controlling temperatures ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
10. Procedure10.1 Lower the mercury level from the collection flask.10.2 Evacuate the system of collection flask and degassing flask to an absolute pressure of 13 10/-3 torr (130 mPa) or less. (In Fig.1, the space above the mercury in the reservoir must also be evacuated.)10.3 Connect the oil sample ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
METHOD A - VACUUM EXTRACTION8. Method A - Vacuum Extraction8.1 Method A employs vacuum extraction to separate the gases from the oil. The evolved gases are compressed to atmospheric pressure and the total volume measured. The gases are then analyzed by gas chromatography.9. Preparation of Apparatus9.1 ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
7. Sampling7.1 Obtain samples in accordance with the procedure described in Test Methods D 3613 for sampling with syringetype devices or rigid metal cylinders. The use of rigid metal cylinders is not recommended for use with Method B.7.2 The procurement of representative samples without loss of dissolved ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
6. Apparatus6.1 Apparatus of the type shown in Fig.1 or Fig.2 is suitable for use with up to 50-mL samples of oil and consists of the following components:NOTE 2 - This sample size has been found to be sufficient for most oils. However, oil that has had only limited exposure to air may contain much smaller ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
4. Summary of Test Method4.1 Method A - Dissolved gases are extracted from a sample of oil by introduction of the oil sample into a pre-evacuated known volume. The evolved gases are compressed to atmospheric pressure and the total volume measured.4.2 Method B - Dissolved gases are extracted from a sample ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 gas content of oil by volume - in Method A, the total volume of gases, corrected to 760 torr (101.325 kPa) and 0°C, contained in a given volume of oil, expressed as a percentage.In Methods B and C, the sum of the individual gas concentrations ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
1. Scope1.1 This test method covers three procedures for extraction and measurement of gases dissolved in electrical insulating oil having a viscosity of 20 cSt (100 SUS) or less at 40°C (104°F), and the identification and determination of the individual component gases extracted. Other methods have ...
