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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
METHOD C - HEADSPACE SAMPLING27. Method C - Headspace sampling27.1 Method C consists of bringing an oil sample in contact with a gas phase (headspace) in a closed vessel purged with argon. As a result, a portion of a gas (H2, O2, N2, CH4, CO, CO2, C2H2, C2H4, C2H6, or C3H8) of concentration C (O/L) dissolved ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
26. Precision and Bias26.1 The precision, bias and lower limit of detection of Method B have been evaluated by a statistical examination of the results of an inter-laboratory test of mineral oil test specimens. A lower limit of repetition is defined here as an aid in the testing of transformers in factories.26.2 ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
23. Procedure for Direct Injection23.1 Prepare the gas chromatograph as outlined by the manufacturer.23.2 Prepare the sample for injection by first dissolving any gas bubble present into the volume of oil by compressing the plunger into the barrel of the syringe and agitating the gas by tipping the syringe ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
21. Calibration (Gases)21.1 Prepare the gas chromatograph for use as directed by the manufacturer, and establish a set of operating conditions capable of separating the indicated component gases.21.2 Inject a pre-established volume of the reference standard (low concentration) gas mixture into the chromatograph ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
20. Reagent and Materials20.1 Suitable Chromatography Columns - Several combinations have been found to be suitable including molecular sieve, Porapak Q, Porapak N, diisodecyl phthalateA, Silica Gel J, Chromosorb 102, Carbosieve B, and Sperocarb. Molecular sieve is used to separate H2, O2, N2, CH4, and ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
METHOD B - STRIPPER COLUMN EXTRACTION18. Method B - Stripper Column Extraction18.1 Dissolved gases are extracted from a sample of oil by sparging the oil with the carrier gas on a stripper column containing a high surface area bead. The gases are then flushed from the stripper column into a gas chromatograph ...
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ASTM D3612 for insulating oil dissolved gas analysis by gas chromatography
17. Precision and Bias17.1 The precision, bias and lower limit of detection of Method A have been evaluated by a statistical examination of the results of an inter-laboratory test of mineral oil test specimens.12 A lower limit of repetition is defined here as an aid in the testing of transformers in ...
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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 ...
