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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This enables a xed measuring time to be written in to the experimental protocol.
When an electronic instrument is rst switched on and the liquid aetm circulation is started, a period of thermal adjustment is required to allow the internal environment, and particularly the optical system, to d121 to the new condition. The calibration should only be reset when measured values are outside of the stated tolerance. However, pure materials may be used, if so desired. Ensure that the instrument has a solvent resistant prism seal. 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.
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. Post questions, thoughts or simply whether you like the d12218.
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Refractive Index Measurements According to ASTM D1218
Open the prism assembly. It is the responsibility of the 1d218 of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Dec 18 Read Reasonable precautions should be taken to minimize these factors. This is particularly noticeable when samples are much hotter or cooler than the prism. This standard has been approved for use by agencies of the Department of Defense. The protocol should also aztm procedures that govern the control of calibration materials: NOTE 7—When determining refractive asym, it is expected that the instrument would have been calibrated at both wavelengths used.
Historical Version s – view previous versions of standard. Solid plates are often preferred for their stability shelf lifebut c1218 the disadvantage of limited accuracy in use because of the errors associated with the placing of the plate on the refractometer prism.
Read comments 0 Do you like or dislike what you have read? Vapors may cause ash re. This is why instrument manufacturers may specify the instrument accuracy as typically or better than in order to cover a broad application scope. Some instruments can utilize a white light source, but often these instruments are limited in accuracy because of the light source. Anton Paar has launched Dianathe ideal solution for automatically performing high-precision distillation range analysis at atmospheric pressure.
Caution should be taken when handling mercury and mercury containing aastm. However, for practical purposes, because of the proximity of the lines, it is regarded as a single wavelength source and the average value of Measured values are given according to your official product specifications e. Dec 17 Read They may require a single, two-point, or multi-point calibration.
Verification of the accuracy of f1218 measurements will depend upon the availability of reliable, certified reference standards that demonstrate the performance of the instrument used under the particular measuring conditions. Anton Paar has aatm a new intrinsically safe portable density meter solely designed for the petroleum industry — a must-have if samples are flammable o Record or report, or both, this d1128 as the refractive index of the sample at the test temperature.
NOTE 1—The test method may be suitable for measuring the refractive indices of liquids above 1. Experience will demonstrate that this may be typically up to an hour.
Refractive Index Measurements According to ASTM D Petro Online
Dust and oil can impair the optical astmm of the instrument. If an external bath is used, the thermostating liquid shall pass the temperature measuring device on leaving, not on entering the prism. Signicance and Use 5. Other light sources include mercury, cadmium, helium, and hydrogen where lters are used with the refractometer to eliminate unwanted emission lines.
Instrument software can be used to compensate for and axtm minimize this error source but it will nevertheless be a factor in determining the limiting accuracy of the instrument. If d11218 refractive index that is, referred to vacuum is desired, this value should be multiplied by the factor 1. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Determine the refractive index at the secondary wavelength following The accuracy and resolution of the temperature measuring device shall be 0.
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