ASTM D1218 PDF

D – 99 Standard Test Method for Refractive Index and Refractive Dispersion of Hydrocarbon Liquids, hydrocarbons, refractive dispersion, refractive index. ASTM D(R07) – Designation: D – 02 (Reapproved ) An American National Standard. As well as adding a sample changer or special density cell for high pressures and temperatures, a DMA Generation M density meter from Anton Paar (Austria) .

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The degree of impurity band width will cause a dispersion of the detected light from the sample. New FM approved liquid analyser system is safe for h Stability Uniformity D12188 Resolution 6 0.

Link to Active This link will always route to the current Active version of the standard. Note 1 — The test method may be suitable for measuring the refractive indices of liquids above 1. Dec 17 Read Precision and Bias Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Analytical Instrumentation Anton Paar has launched Dianathe ideal solution for automatically performing high-precision distillation range analysis at atmospheric pressure.

Based on this, it may be possible on some models to set an automatic delay time for readings. Leaving comments on product information and articles can assist with future editorial and article content. Ensure the prism temperature is correct and the instrument has been properly calibrated. In circumstances where the instrument is used continuously and in a constant thermal condition, the need for recalibration should be minimal. Verification of the accuracy of asttm measurements will depend upon the availability of reliable, certified reference standards that demonstrate the performance of the instrument used under the particular measuring conditions.

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No other units of measurement are included in this standard.

Refractive Index Measurements According to ASTM D Petro Online

Sep 19 Read Originally published as Lawrey, D. Apply a drop of 1-bromonaphthalene contact liquid, about 1. Report the calculated value and the test temperature, for example: Adtm each calibration a suitable calibration standard should be used. Link to Active This link will always route to the current Active version of the standard.

ASTM D(R07)_百度文库

A disadvantage of reectance is the difficulty of observing the borderline in optical-mechanical Abbe instruments because of the low light intensity and poor contrast. Jul 17 Read The QC testing frequency should be increased if a large number of samples are routinely analyzed. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you qstm attend.

Safe and reliable pressure calibration and pressure Vapors may cause ash re.

Refractive Index Measurements According to ASTM D1218

If absolute refractive index that is, referred to vacuum is desired, this value should be multiplied by the factor 1. Liquid color should be limited to No.

This will entail regular checks on measurement accuracy verication using reliable standards. This is particularly noticeable when samples are much hotter or cooler than the prism. The precision of the test method see Water can be removed from hydrocarbons by treatment with calcium chloride followed by ltering or centrifuging to remove the desiccant.

NOTE 9—When successive readings are drifting, the direction of drift will indicate what is happening to the sample. Test plates are particularly difficult to apply to sapphire prisms of the type typically used in digital electronic refractometers. Reasonable precautions should be taken to minimize these factors. The dispersion error will however differ according to the substance measured. Calculation and Report The relative change in refractive index with temperature temperature coefficient is different for each liquid under test.

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NOTE 6—The constancy of the prism temperature can be seriously affected by variations in ambient conditions such as air drafts or changes in room temperature. Active view current version of standard. Benefit from extensive experience in petroleum testing technology. Current edition approved Nov. Allow 3 min temperature equilibration time. Analytical Instrumentation Anton Paar has launched a new intrinsically safe portable density meter solely designed for the petroleum industry — a must-have if samples are flammable o Turn on the light source.

This standard has been approved for use by agencies of the Department of Defense. Last previous edition approved in as D — Liquid color should be limited to No. Do you like or dislike what you have read?

Caution should be taken when handling mercury and mercury containing products. NOTE 8—From experience using the instrument, the user will be able to judge with a safe margin the amount of time needed for a sample to thermally equilibrate on the prism. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of sstm limitations prior to r1218.

Active view current version of standard Translated Standard: