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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Trending Asttm Risks and side effects The underestimated dang Sep 19 Read Active aatm current version of standard Translated Standard: Safe and reliable pressure calibration and pressure Liquid color should be limited to No. Spectro Scientific acquired by Ametek Dec 14 Read D — 02 Reapproved An American National Standard Standard Test Method for Refractive Index and Refractive Dispersion of Hydrocarbon Liquids1 This standard is issued under the xed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
Link to Active This link will always route to the current Active version of the standard. If the observed refractive index for the chosen reference material at a specied test temperature differs by more than 0. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The optical system in a refractometer is subject to microscopic movement as materials expand and contract with uctuating ambient thermal conditions.
Lower the sample presser if tted. The instrument shall incorporate a solventresistant prism seal. Make your daily measuring routine a piece of cake: High accuracy Abbe refractometers require a pure spectral light source such as a sodium arc lamp see 6. However, this instrument is no longer manufactured.
A light reection mechanism has the advantage that effects of absorption highly colored samples are minimized. Last previous edition approved in as D — Any calibration uid could be used. There is a variety of refractometers that have been found to be suitable for this measurement.
Refractive Index Measurements According to ASTM D Petro Online
X1218 can be used to eliminate unwanted lines borderlines. No other units of measurement are included in this standard. A number in parentheses indicates the year of last reapproval. Automatic digital refractometers may require a single zerotwo-point, or multi-point calibration.
Discover the gold at the bottom of the barrel. Analytical Instrumentation Anton Paar has launched Dianaastmm ideal solution for automatically performing high-precision distillation range analysis at atmospheric pressure. This effect leads to calibration drift, which must be periodically corrected to ensure measurement reliability. In circumstances where the instrument is used continuously and in a constant thermal condition, the need for recalibration should be minimal.
Their vapor can be harmful. Turn on the light source and allow the refractometer to equilibrate for 30 min.
Refractive Index Measurements According to ASTM D1218
Open the prism assembly. It is the responsibility of the user of this standard to establish asm safety and health practices and determine d1281 applicability of regulatory limitations prior to use. For each calibration a suitable calibration standard should be used. Link to Active This link will always route to the current Active version of the standard. Most measurements traditionally have been made at the sodium D line No other units of measurement are included in this standard.
Refractive index should, therefore, be measured using light of a single wavelength monochromatic light.
Verification of the accuracy of such x1218 will depend upon the availability of reliable, certified reference standards that demonstrate the performance of the instrument used under the particular measuring conditions.
Similarly, if the circulating liquid temperature is changed, a new calibration sequence will be required. This can be manually recorded or, if the refractometer is equipped with a computer interface, readings can be sent to a printer wstm to a computer. This is particularly noticeable when samples are much hotter or cooler than the prism. Close the prism assembly and lock if necessary. This will entail regular checks on measurement accuracy verication using reliable standards.
D — 02 X2. The relative change in refractive index with temperature temperature coefficient is different for each liquid under test. The temperature control unit external or internal shall have the following control specication: 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.
Mercury, or its vapor, may be hazardous to health and corrosive to materials. Thoroughly clean the prism faces with toluene, 2 6.