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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Lower the sample presser if tted. This will entail regular checks on measurement accuracy verication using reliable standards.
They may require a single, two-point, or multi-point calibration. Report the calculated value and the test temperature, for example: Automatic digital refractometers may require a single zerotwo-point, or multi-point calibration. Some instruments can utilize a white light source, but often these instruments are limited in accuracy because of the light source.
Warning—2,2,4trimethylpentane, methylcylcohexane, and toluene are all ammable. Other light sources include mercury, cadmium, helium, and hydrogen where lters are used with the refractometer to eliminate unwanted emission lines. Measured values are given according to your official product specifications e.
Refractive Index Measurements According to ASTM D Petro Online
D — 02 Rautomatic 5 0. Allow 3 min temperature equilibration time. Active view current version of standard Translated Standard: Dec 17 Read Liquid color should be limited to No. Verication of the accuracy of such measurements will depend upon the availability of reliable, certied reference standards that demonstrate the performance of the instrument used under the particular measuring conditions.
Apply a drop of 1-bromonaphthalene contact liquid, about 1. Some instruments offer a wider measuring range but it is important to verify the uniformity of accuracy across the entire measuring range and to ensure suitable calibration materials are available for this verication.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Refractive Index Measurements According to ASTM D1218
Press the reference standard against the surface of the prism face with the polished end towards the light source. Based on this, it may be possible on some models to set an automatic delay time for readings.
Density and refractive index are then determined at the same time from the same sample which saves time and provides reliable results when analysing aviation fuels or similar finished products.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Verification of the accuracy of such measurements will depend upon the availability of reliable, certified reference standards that demonstrate the performance of the instrument used under the 1d218 measuring conditions. This is why instrument manufacturers may specify the instrument accuracy as typically or better than in order to cover a broad application scope.
The temperature control unit external or internal shall have the following control specication: Dec 22 Read Warning—Volatile asrm samples are ammable. Trending Articles Risks and side effects The underestimated dang Most measurements traditionally have been made at the sodium D line Your comments will receive careful consideration ast, a meeting of the responsible technical committee, which you may attend.
However, for practical purposes, because of the proximity of the lines, it is regarded as a single wavelength source and the average value of The possibility of changing the x1218 of the sample by action of the drying agent, by selective adsorption on the lter, or by fractional evaporation, shall be considered. Typically, a plate may not allow an accuracy better than High accuracy Abbe refractometers require a pure spectral light source such as a sodium arc lamp see 6.
New FM approved liquid analyser system is safe for h Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
NOTE 9—When successive readings are drifting, the direction of drift will indicate what is happening to the sample. Last previous edition approved in as D — The numerical value of refractive index of liquids varies inversely with both wavelength and temperature. 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.