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MINIVAP VPXpert / L Vapor Pressure Tester


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MINIVAP VPXpert is the 3rd generation vapor pressure tester for the automatic determination of the vapor pressure of gasoline, gasoline oxygenate blends and crude oil for all vapor pressure standards.

Incorporating the Grabner triple expansion method and the US EPA reference method for the determination of vapor pressure, the instrument is designed for significantly improved precision, reliability and performance.

Made by experts for expert testing, the ergonomically designed analyzer offers unmatched versatility: The instrument incorporates features for V/L ratio determination (ASTM D5188), for crude oil (ASTM D6377) and R&D applications and volatility studies over an unprecedented temperature range (0-120°C). The innovative Sampling Pro™ technology minimizes the risk of cross contamination between different sample types.

NEW! Low Volatility Model VPXERT-L
The model MINIVAP VPXpert-L was developed to automate the manual ASTM D2879 Standard Test Method for Vapor Pressure by Isoteniscope used by the chemical industry. The MINIVAP VPXpert-L analyser measures gasoline, jet fuels, solvents and chemicals as well as food, flavor and fragrance products with vastly improved precision. The analyzer is optimized for a pressure range from 0.1 to 100 kPa and shows a measuring repeatability better than 0.1 kPa. The instrument incorporates a direct and an extrapolated method for absolute vapor pressure measurement of single- and multi-component samples. 

NEW! RUN12 Autosampler
The 12-position autosampler is the best solution to achieve a fast sample throughput. No need to attend during testing. Tap water cooling is possible to assist with testing of cooled and air saturated samples. Click on the Autosampler Tab for a short video.

SAMPLING PRO™ Valve Design
While more and more Ethanol is added into fuels, the risk of cross contamination between tests of various samples increases. Testing E85 prior to regular base fuels can affect vapor pressure measurement results of the base fuels. The MINIVAP VPXpert incorporates Sampling Pro™ technology, a high quality valve design, which minimizes the risk of cross contamination between different sample types.

Vapor Pressure of Gasoline - The Latest Mini-Method
ASTM D6378 is the "Triple Expansion Method" with determination of the dissolved air in the sample. It was developed by GRABNER INSTRUMENTS and replaces ASTM D5191. Cooling and air saturation is NOT required!

Vapor Pressure of Crude Oil - The Official method
ASTM D6377 is the new "Single-Expansion Method" for vapor pressure of Crude Oil developed by GRABNER INSTRUMENTS. The pressurized sample is transferred into the measuring chamber and expanded to the final volume by the built-in piston. The precision of this method is better than the classical ASTM method of D323 (ASTM correlation formula is available). Due to the outstanding measuring principle of MINIVAP, the sample preparation prior to the measurement is not necessary.
You save expensive labor time with better precision and possible operator bias is eliminated.

V/L-RATIO (ASTM D5188) - The Fastest Method
The MINIVAP VPXpert determines ASTM D5188 V/L ratio of non-viscous liquids including hydrocarbons like gasoline, solvents and other highly volatile compounds over a wide temperature range. The instrument performs fully automatically, providing results in minutes. No additional equipment is required.

Vapor Pressure of LPG up to 1000 kPa (ASTM D6897, VPXpert only)
ASTM D6897 is the method of choice for easy, quick and accurate measurement of liquefied petroleum gas and replaces the manual bomb method ASTM D1267. ASTM D6897 yields results in excellent correlation with ASTM D1267, but with a highly improved precision. The new method offers full automation for LPG measurements, eliminates manual operation and cleaning and minimizes sample waste. MINIVAP VPXpert is able to measure LPG up to 1000 kPa. Please contact your distributor for a free LPG method upgrade. The LPG method is not available for the low volatility model VPXpert-L.
Direct / Indirect Determination of the Absolute Vapor Pressure ("VOC-Methods")
The direct "VOC"-method is a static method for determining the absolute vapor pressure required for safety data sheets. The indirect method additionally allows to extrapolate to extremely low pressures or to temperatures that exceed the instruments temperature range (-99°C to +300°C). Both methods yield results comparable to the static ASTM D2879 Isoteniscope method, but do not require sample evacuation prior to testing. Based on the GRABNER Triple Expansion Method, air/gases are removed automatically from the measurement result and the sample composition is maintained during measurements. The "VOC"-methods are available only for the low volatilty model MINIVAP VPXpert-L.

Piston Based Technique
The unique measuring principle with the integrated piston for automatic sample introduction and expansion offers high accuracy, easy operation and eliminates the use of a vacuum pump.

DVPE of Gasoline
ASTM D5191 is the standard "Mini-Method" and required only 1 mL of sample, measured against vacuum and a correlation formula for the calculation of the DVP. Sample preparation, including cooling of the sample to 0°C (32°F) and triple air saturation prior to the measurement is required.

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