MINIVAP VPXpert, the third-generation vapor pressure tester, can be used to automatically measure the vapor pressure of gasoline oxygenate blends, gasoline, and crude oil in compliance with all vapor pressure standards.
The instrument has been incorporated with the Grabner triple expansion method and the US EPA reference technique for determining vapor pressure. It has been designed to ensure considerable improvement in reliability, accuracy, and performance.
The analyzer is ergonomically designed by experts for expert testing and ensures unrivaled versatility: The instrument combines features for determining V/L ratio (ASTM D5188) of crude oil (ASTM D6377) and for volatility studies and R&D applications across an unparalleled temperature range of 0–120 °C. The novel Sampling Pro™ technology reduces the chances of cross-contamination between samples of different types.
The 12-position autosampler is the ideal solution to realize a rapid sample throughput. It eliminates the need to monitor while performing tests. It is feasible to carry out tap water cooling to help with the testing of air-saturated and cooled samples.
SAMPLING PRO™ Valve Design
There are higher chances of cross-contamination between tests of different samples when increasing amounts of ethanol are added into fuels. Vapor pressure measurement results of regular base fuels can be affected if E85 is tested before the base fuels. The Sampling Pro™ technology integrated into the MINIVAP VPXpert is a high-quality valve design that reduces the risk of cross-contamination between samples of different types.
Vapor Pressure of Gasoline — The Latest Mini-Method
ASTM D6378 denotes the “Triple Expansion Method” for determining the dissolved air in a sample. Designed by Grabner Instruments, it is the substitute for ASTM D5191. It eliminates the need for air saturation and cooling.
Vapor Pressure of Crude Oil — The Official method
ASTM D6377 denotes the new “Single-Expansion Method” developed by Grabner Instruments to determine the vapor pressure of crude oil. Once the pressurized sample is transferred into the measuring chamber, the integrated piston expands it to the final volume. This method has a better precision when compared to the classical ASTM method of D323 (which includes ASTM correlation formula). The need for sample preparation before the measurement is eliminated by the superior measuring principle of MINIVAP.
The improved precision of the instrument saves valuable labor time. It also eliminates potential operator bias.
V/L-RATIO (ASTM D5188) — The Fastest Method
The MINIVAP VPXpert has the ability to determine ASTM D5188 V/L ratio of non-viscous liquids, including hydrocarbons such as solvents, gasoline, and other highly volatile compounds, over a broad range of temperatures. The instrument functions in a completely automatic manner and generates results within a few minutes. It avoids the need for using additional equipment.
Vapor Pressure of LPG up to 1000 kPa (ASTM D6897)
ASTM D6897 is the preferred method for rapid, easy, and precise measurement of liquefied petroleum gas and is a substitute for the ASTM D1267 manual bomb method. The results generated by ASTM D6897 are in excellent correlation with ASTM D1267 and have a considerably enhanced precision. The new method avoids the need for manual operation and cleaning, enables complete automation for LPG measurements, and reduces the wastage of samples. MINIVAP VPXpert has the potential to measure LPG at pressures of up to 1000 kPa.
The exclusive measuring principle in combination with the built-in piston for automatic introduction and expansion of sample not just ensures simple operation and high accuracy but also avoids the need for using a vacuum pump.
DVPE of Gasoline
ASTM D5191 denotes the established “Mini-Method” and necessitates only 1 mL of the sample, measured against vacuum and a correlation formula for determining the DVP. Sample preparation is necessary and involves cooling the sample to 0 °C, or 32 °F, and performing triple air saturation before the measurement.