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Vapour Pressure Testing at its Best

With unmatched precision, speed and versatility ERAVAP is the instrument of choice for vapor pressure testing of e.g. gasoline, crude oil, LPG, solvents, fragrances or aqueous solutions in full compliance with the latest international standards. With eralytics latest invention, the ultra-light temperature-controlled U-tube density meter module DENS4052 (patent pending), ERAVAP offers even more: simultaneous measurement of vapor pressure and density in a single, portable analyzer.


ASTM D5188
ASTM D5191
ASTM D4052
ISO 12185
ASTM D6377
ASTM D6378
ASTM D6897
EN 13016-1
EN 13016-2
EN 13016-3
JIS K2258-2
SHT 0769
SHT 0794
SNT 2932
GOST 52340

Correlation to

ASTM D1267
ASTM D2533
ASTM D2879
ASTM D4953
ASTM D5190
ASTM D5482

Unmatched Performance

ERAVAP is a compact, highly precise, yet easy to use vapor pressure tester. It is known for vapor pressure testing with unmatched precision, speed and versatility over the widest available temperature range from -20 °C to 120 °C (4 °F to 248 °F) on the market. A small footprint and true portability even with an attached 10-position autosampler make it the ideal choice for stationary and mobile laboratories.

The California Air Resource Board (CARB) relies on the unrivaled precision of ERAVAP as well as the U.S. EPA who uses ERAVAP as their reference instrument for vapor pressure testing. Additionally, ERAVAP is field proven by the US Army with close to one hundred installations in their mobile laboratories around the world.

ERAVAP 2-in-1: Simultaneous Measurement of VAPOR PRESSURE + DENSITY with a Single, Portable Analyzer

The latest ground-breaking innovation for ERAVAP is the optional combination with eralytics’ new temperature-controlled U-tube density meter module DENS4052. This integrated ultra-light (< 1 kg!) density meter module (patent pending) offers density measurements in full compliance with ASTM D4052 & ISO 12185 (r = 0.0001 g/cm³).

ERAVAP is now the only vapor pressure tester on the market which allows for simultaneous measurements of two parameters listed in international fuel specifications like ASTM D4814 and EN 228 in a single analyzer, namely the vapor pressure of gasoline according to ASTM D5191 and the density of gasoline, diesel or jet fuel according to ASTM D4052. Its portable and rugged design makes ERAVAP the perfect solution for mobile laboratories, terminals, and field use.

For deeper insights into the simultaneous measurement of vapor pressure and density please download the latest application note “Combining Vapor Pressure & Density”.

Unique X-oscillating metal U-tube design

The optional density meter module DENS4052 made from the special metal Hastelloy is based on an innovative X-oscillating U-tube where only the straight tubes of the U-tube are vibrating towards each other. In contrast to rEalytics x-oscillating U-tube, traditional glass U-tube density meters oscillate in the Y-mode, requiring a heavy counterweight which makes them sensitive against external shocks and vibrations. Eralytics’ innovative X-oscillating metal U-tube design is highly resistant against shocks and vibrations and makes it perfectly suitable for the measurement of all kinds of sample types also in the harshest conditions like directly in the field.

ERAVAP – Unique Measuring Options

The Vapor Pressure Tester ERAVAP is available in two models. ERAVAP (EV10) for vapor pressure testing of all kinds of liquids up to a max. vapor pressure of 1000 kPa (145 psi) and ERAVAP LPG (EV20) for vapor pressure testing of LPG’s featuring an extended pressure range of up to 2000 kPa (290 psi). To complete your range of applications, Eralytics offers a variety of unique measuring options for both ERAVAP models. Get an overview of the unique measuring options of ERAVAP here >>

TVS™ – Temperature Verification Sensor for ASTM D5191 Testing

One more great feature for ERAVAP is the TVS™ – ASTM D5191 Temperature Verification Sensor (patent pending) for high precision vapor pressure testing of gasoline. This all-new temperature sensor allows easiest monitoring of the temperature directly in the sample container, featuring an immediate check of the sample preparation even before the actual measurement starts. TVS™ enables the specification of upper (and lower) temperature limits triggering an automatic warning, if the sample temperature does not match the requirements. Thus TVS™ is a very efficient tool helping you to save time and money while improving the quality control in your testing lab. Watch our latest video to get an overview of how the Temperature Verification Sensor TVS™ for ERAVAP works.

Superior Repeatability

Recent improvements in the design of ERAVAP led to an improved repeatability and reproducibility for vapor pressure testing. With a repeatability of only r ≤ 0.15 kPa and a reproducibility of R ≤ 0.50 kPa for ASTM D5191 and D6378 reference materials at 37.8 °C (100 °F) it clearly outperforms the precision statements of its own ASTM standards. Using ASTM D6378 instead of D5191 for vapor pressure testing additionally eliminates any operator bias caused by incorrect sample preparation needed only for ASTM D5191.

Please reference the graph for latest repeatability measurements of the latest ERAVAP generation using cyclopentane and pentane at 37.8°C (100 °F).

Outstanding Design

With its quality-centric design ERAVAP was not only designed for highest precision but also for highest durability. The self-lubricating piston and the powerful Peltier elements are the instrument’s centerpiece. It is built for highest sample throughput rates at minimum maintenance. Furthermore, recalibration of the instrument can be performed without any special tools or disassembling the unit.

Eralytics patent pending Pure Sampling™ technology minimizes the possiblity of cross contamination between measurements.

Range of Applications

The area of applications ranges from freely programmable test methods for R&D labs to push-button simplicity. With its extended temperature range from -20 °C to 120 °C (4 °F to 248 °F) and V/L ratios ranging from 0.02/1 to 100/1 it can cope with the most difficult measurement scenarios as well as with routine analysis. Vapor pressure testing of up to 1,000 kPa is possible. In combination with a 12 V DC adapter, it can even be run by a vehicle battery, allowing vapor pressure testing in the field.

With its innovative design ERAVAP is capable of measuring gasoline, oxygenated gasoline as well as any other solvent or even polymers. It is used worldwide by refineries, terminals, oil and pipeline companies as well as authorities and independent laboratories.

High Viscosity Module

ERAVAP already covers a wide range of applications with its standard configuration. However, if the viscosity of the samples increases it gets more difficult to draw them into the measurement cell. In such cases heating up the sample prior to introduction helps. During the measurement, the sample sitting in the tubes will cool down potentially blocking them after the measurement.

ERAVAP’s high viscosity extension heats the inlet and outlet as well as all transfer tubes up to 70 °C. The temperature is regulated to a defined value set in the measurement menu of the instrument. Using this module further extends the applicability of ERAVAP to a larger range of samples.

Measurement Procedure

Apart from sample preparation according to the relevant standards, just four simple steps are needed for high quality vapor pressure testing:

  1. Enter sample ID and operator name
  2. Select the measurement standard and add additional parameters when necessary
  3. Place the sample beside the analyzer and put the tubing inside the sample
  4. Press the RUN button

The instrument now visualizes the measurement procedure on the screen showing the sample and piston position, as well as the temperature and pressure within the measurement cell. The resulting vapor pressure is calculated according to the relevant standards and displayed.

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