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MiniVap VPXpert


Product Video

Training Video

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.

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)
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.

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.

  • Specifications +


    • ASTM D5191 (Dry Vapor Pressure Equivalent)
    • ASTM D6378 - Vapor Pressure of Gasoline (VP4)
    • ASTM D6377 - Vapor Pressure of Crude Oil
    • ASTM D6897 - Vapor Pressure of LPG up to 1000 kPa
    • ASTM D5188 - (V/L-Ratio)
    • EN 13016 - 1 (Air Saturated Vapor Pressure)
    • EN 13016 - 2 (Absolute Vapor Pressure)
    • IP 394 & 409 & 481
    • JIS K2258-2, SHT 0769, GOST 52340
    • US EPA approved Grabner test method for highest accuracy


    • ASTM specified correlation to D323 (Wet Reid)
    • ASTM specified correlation to D4953 (Dry Reid)
    • ASTM D5482 (Mini-Method, atmospheric)
    • ASTM D1267 (LPG)


    • Sampling Pro™ Valve Design
    • No vacuum pump or sample preparation necessary!
    • Integrated shaker for crude oil samples and rapid equilibrium
    • Automatic piston lubrication
    • Maintenance free, heavy duty measuring cell
    • Smallest sample size: 1 ml w/o rinsing
    • Fast measurements: Results in 5 minutes
    • One button usability
    • Enhanced report generation
    • Ergonomic, portable and rugged design
    • Large, durable display - fit for field use
    • MINIWIN for seamless LIMS-integration
    • User access control
    • Audit trailing

    Printer and PC recommended

    Technical Data

    Temperature Range
    Measured: 0 to 120°C (user programmable)
    Temperature Stability
    ± 0.01°C
    Temperature Profiles
    Single temperature, stepped or ramped
    Pressure Range
    0 to 1000 kPa (0 to 145 psi)
    Pressure Resolution
    0.1 kPa
    Pressure Tolerance
    0.1 kPa
    Vapor-Liquid Ratio
    0.02/1 to 100/1, adjustable per selected method
    Power Requirements
    90-264 V AC, 45-63Hz, 200W (Switching Power Supply)
    Field Application
    DC/AC Power Converter 12V / 200W
    W x H x D
    253 x 368 x 277 mm (10 x 14.5 x 10.9 in)
    9 kg (20 lb)

    Precision Data
    MINIVAP (37.8°C @ 70 kPa)
    ASTM D323 (Wet Reid Bomb)

    ±0.3 kPa (0.04 psi)
    ±3.2 kPa (0.46 psi)

    ±0.7 kPa (0.10 psi)
    ±5.2 kPa (0.75 psi)

    The sample is contained in a 10 mL syringe (3) or in a sample container for direct sampling. The automatic sample introduction and the volume adjustments are made by a piston with an integrated pressure transducer (1). The measuring chamber (2) with a total volume of 5 mL is automatically rinsed and filled with 1 mL for the measuring process. After closing the valve (4) driven by the valve motor (5), the volume expansion to 5 mL (with the sample under vacuum condition) is obtained by a further stroke of the piston. The temperature of the measuring cell is controlled with a high-power thermoelectric module (6) and measured with a precision Platinum RTD sensor (7). After the sample introduction and the volume expansion, the test temperature is adjusted. After the equilibrium time, the measurement of the dissolved air is completed. Test results of DVPE, ASVP, Pgas and Pabs are displayed and printed.

    Automatic piston lubrication is processed with every piston stroke.

    Continuous product development may make it necessary to change product specifications without notice.

  • Downloads +

  • Standards +

    ASTM D1267
    Standard Test Method for Gage Vapor Pressure of Liquefied Petroleum (LP) Gases (LP-Gas Method)

    ASTM D2879
    Standard Test Method for Vapor Pressure-Temperature Relationship and Initial Decomposition Temperature of Liquids by Isoteniscope

    ASTM D323
    Standard Test Method for Vapor Pressure of Petroleum Products (Reid Method)

    ASTM D3700
    Standard Practice for Obtaining LPG Samples Using a Floating Piston Cylinder

    ASTM D4953
    Standard Test Method for Vapor Pressure of Gasoline and Gasoline-Oxygenate Blends (Dry Method)

    ASTM D5188
    Standard Test Method for Vapor-Liquid Ratio Temperature Determination of Fuels (Evacuated Chamber Method)

    ASTM D5190
    Standard Test Method for Vapor Pressure of Petroleum Products (Automatic Method)

    ASTM D5191
    Standard Test Method for Vapor Pressure of Petroleum Products (Mini Method)

    ASTM D5482
    Standard Test Method for Vapor Pressure of Petroleum Products (Mini Method—Atmospheric)

    ASTM D6377
    Standard Test Method for Determination of Vapor Pressure of Crude Oil: VPCRx (Expansion Method)

    ASTM D6378
    Standard Test Method for Determination of Vapor Pressure (VPX) of Petroleum Products, Hydrocarbons, and Hydrocarbon-Oxygenate Mixtures (Triple Expansion Method)

    ASTM D6897

    Standard Test Method for Vapor Pressure of Liquefied Petroleum Gases (LPG) (Expansion Method)