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 possibility of changing the composition of the sample by action of the drying agent, by selective adsorption on the lter, or by fractional evaporation, shall be considered. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability c1218 regulatory limitations prior to use.

Individual reprints single or multiple copies of this standard may be astmm by contacting ASTM at the above address or at phonefaxor service astm. Originally published as Asym, D. Turn on the light source and allow the refractometer to equilibrate for 30 min. A superscript epsilon e indicates an editorial change since the last revision or reapproval. 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.

NOTE 9—When successive readings are drifting, the direction of drift will indicate what is happening to the sample.

Refractive Index Measurements According to ASTM D1218

The accuracy and resolution of the temperature measuring device shall be 0. Dec 17 Read This can be manually recorded or, if the refractometer is equipped with a computer interface, readings can be sent to a printer or to a computer. However, when it is demonstrated that the test method is under statistical control, the QC testing frequency may be reduced. This is particularly noticeable when f1218 are much hotter or cooler than the prism.


This enables a xed measuring time to be written in to the experimental protocol. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

They may require a single, two-point, or multi-point calibration. Measured values are given according to your official product specifications e.

Leaving comments on product information and articles can assist with future editorial and article content. Benefit from extensive experience in petroleum testing technology. The awtm contains all required components ac The instrument shall incorporate a solventresistant prism seal. Ensure that the instrument has a solvent resistant prism seal. The results of such investigation may, but not necessarily, result in instrument recalibration.

The degree of impurity band width will cause a dispersion of the detected e1218 from the sample. Analytical Instrumentation Anton Paar has launched Dianathe ideal solution for automatically performing high-precision distillation range analysis at atmospheric pressure.

Some instruments can utilize a white light source, but often these instruments are limited in accuracy because of the light source. 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. This combination of instruments is the first step to a modular measuring system called the Modulyser Unlimited Class. The precision of the test method see When an electronic instrument is rst switched on and the liquid bath circulation is started, a period of thermal adjustment is required to allow the internal environment, and particularly the optical system, to adjust to the new condition.

If an external bath is used, the thermostating liquid shall pass the temperature measuring device on leaving, not on entering the prism. Based on this, it may be possible on some models to set an automatic delay time for readings. Dec 27 Read Thoroughly clean the prism faces with toluene, 2 6.


Refractive Index Measurements According to ASTM D Petro Online

The temperature control unit external or internal d128 have the following control specication: Current edition approved Nov.

Turn on the light source. Discover the gold at the bottom of the barrel. Summary of Test Method 4. However, for practical purposes, because of the proximity of the lines, it is regarded asgm a single wavelength source and the average value of This is the relative index of refraction.

This is because the micro-roughness of sapphire is greater than that of softer optically atter glasses used in optical Abbe refractometers. Stability Uniformity Display Resolution 6 0. 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.

Active view current version of standard. Signicance and Use 5. The sample shall be free of suspended solids, water, or other materials that may settle onto the prism surface and affect the measured reading.

Note 1 — The test method may be suitable for measuring the asgm indices of liquids above 1. If absolute refractive index that is, referred to vacuum is desired, this value should be multiplied by s1218 factor 1.

Historical Version s – view previous versions of standard Translated Version s: Safe and reliable pressure calibration and pressure An ample supply of QC sample material should be available for the intended period of use, and should be homogeneous and stable under the anticipated storage conditions.