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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Thoroughly clean the prism faces with toluene, 2 6. Safe and reliable pressure calibration and pressure The test method may be suitable for measuring the refractive indices of liquids above 1. The degree of impurity band width will cause a dispersion of the detected light from the sample. Mercury, or its vapor, may be hazardous to health and corrosive to materials. To leave comments please complete the form below. Close the prism assembly and lock if necessary.
Discover the gold at the bottom of the barrel. Hydrocarbon liquids have a higher temperature coefficient than water and aqueous solutions. Invariably, liquid reference standards will be preferred and will be recommended by instrument manufacturers for this reason.
There is a variety c1218 refractometers that have been found to be suitable for this measurement.
This combination of instruments is the first step to a modular measuring system called the Modulyser Unlimited Class. Other light sources include mercury, cadmium, helium, and hydrogen where lters are used with the refractometer to eliminate unwanted emission lines.
Different substances have varying degrees of refractive dispersion sometimes called dispersive power. Based on this, it may be possible on some models to set an automatic delay time for readings.
Ensure the prism temperature is correct and the instrument has been properly calibrated. Dec 21 Read 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 Signicance and Use 5. This enables a xed measuring time to be written in to the experimental protocol.
Report the calculated value and the test temperature, for example: 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.
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. Instrument software can be used asym compensate for and thus minimize this error source but it will nevertheless be a factor in determining the limiting accuracy of the instrument.
Refractive Index Measurements According to ASTM D Petro Online
Ensure that the instrument has a solvent resistant prism seal. NOTE 3—Measurement of refractive dispersion requires more than one type of light source.
Filters can be used to eliminate unwanted lines borderlines. Allow 3 min temperature equilibration time. Calibration should not take place until the instrument is in a steady-state. No other units of measurement are included in this standard. Lower the sample axtm if tted.
The temperature control unit external or internal shall have the following control specication: Mercury, or its vapor, may be hazardous to health and corrosive to materials. NOTE 9—When successive readings are drifting, the direction of drift will indicate what is happening to the sample.
Dust and oil can impair the optical component of the instrument. This is why instrument manufacturers may specify the instrument accuracy as typically or better than in order to wstm a broad application scope. 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.
Similarly, if the circulating liquid temperature is changed, a new calibration sequence will be required. Calculation and Report Dec 22 Read Caution should be taken when handling mercury and mercury containing products.
Refractive Index Measurements According to ASTM D1218
High accuracy Abbe refractometers require a pure spectral light source such as a sodium arc lamp see 6. Historical Version s – view previous versions of standard Translated Version s: An upward drift means the sample is cooling on the prism; a downward drift means the sample is warming up. If asmt external bath is used, the thermostating liquid shall pass the temperature measuring device on leaving, not on entering the prism.