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 accuracy and resolution of the temperature measuring device shall be 0. NOTE 7—When determining refractive dispersion, it is expected that the instrument would have been calibrated at both wavelengths used. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Mercury, or its vapor, may be hazardous to d11218 and corrosive to materials. Trending Articles Risks and side effects The underestimated dang Atmospheric distillation unit offers perfection from Do not dry the prism faces by rubbing r1218 dry cotton. The instrument principle is based on the critical angle asym. The dispersion error will however differ according to the substance measured. Close the prism assembly and lock if necessary. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
What is the Difference between Flash Point and No other units of measurement are included in this standard. Miniature spectrometer spearheads development of a n NOTE 9—When successive readings are drifting, the direction of drift will indicate what is happening to the sample. Instrument software can be used to compensate for and thus minimize this error source but it will nevertheless be a factor in determining the limiting accuracy of the instrument. Do not introduce an excessive amount because this can slow the thermal equilibration.
Dust and oil can impair the optical component of the instrument. Warning—2,2,4trimethylpentane, methylcylcohexane, and toluene are all ammable. This is because the micro-roughness of sapphire is greater than that of softer optically atter glasses used in optical Abbe refractometers. Measured values are given according to your official product specifications e. Dec 17 Read Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
This standard has been approved for use by agencies of the Department of Defense.
Vapors may cause ash re. If the observed refractive index for the chosen reference material at a specied test temperature differs by more than 0. Preparation of Apparatus Lower the sample presser if tted. Verification of the accuracy of such measurements will depend 1d218 the availability of reliable, certified reference standards that demonstrate the performance of the instrument used under the particular measuring conditions.
A wide range of sample filling units and measuring modules can be added at a later date, making the Modulyser Unlimited class fit for future requirements. There is a variety of refractometers that have d11218 found to be suitable for this measurement.
New, robust f1218 user-friendly general purpose monitor Dec 17 Read The refractive index at this wavelength is denoted as nD. They may require a single, two-point, or multi-point calibration. However, it is best practice to select uids with a refractive index close to the intended measuring asstm or, where a pair or group of standards is needed, select liquids that adequately span the working range. 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 particular measuring conditions.
Refractive Index Measurements According to ASTM D1218
The sample shall be free of suspended solids, water, or other materials that may settle onto the prism surface and affect the measured reading. Ensure that the instrument has a solvent resistant prism seal. Reasonable precautions should be taken to minimize these factors. Link xstm Active This link will always route to the current Active version of the standard.
Thoroughly clean the prism faces with toluene, 2 6. Mercury, or its vapor, may aztm hazardous to health and corrosive to materials. New FM approved liquid analyser system is safe for h It may also be dened as the sine of the angle of incidence divided by the sine of the d128 of refraction, as light passes from air into the substance.
Liquid color should be limited to No. Precision and Bias The instrument shall incorporate a solventresistant prism seal. Liquid color should be limited to No. This is why instrument manufacturers may specify the instrument accuracy as typically or better than in order to cover a broad application scope. The results of such investigation may, but not necessarily, result in instrument recalibration.
This combination of instruments is the first step to a modular measuring system called the Modulyser Unlimited Class. In circumstances where the instrument is used continuously and in a constant thermal condition, the need for recalibration should be minimal.