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 the 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 100 installations in their mobile laboratories around the world.

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 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.

New: 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.

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 SamplingTM 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 1000 kPa is possible. In combination with a 12 V DC adapter it can be even 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.

Crude Oil Vapor Pressure Testing

Vapor pressure of crude oil is a key parameter when planning the transportation of crudes through different climate zones. When performing crude oil vapor pressure measurements one has to bear the actual ambient conditions during transportation in mind. Is the crude transported in rail cars the headspace is approximately 5% where as a floating roof-top tank has nearly no headspace at all. This is important since the vapor to liquid ratio (V/L) and the storage temperature are highly influencing the vapor pressure of crude. This is especially true for live crude oil which still contains high amounts of volatile light ends.

V/L and Temperature Influences

The graph on the side shows the influence of the V/L ratio and the temperature on crude oil vapor pressure testing.

Measuring at the standard conditions of V/L = 4 and T = 37.8°C the vapor pressure of the sample crude was approximately 40 kPa. At a V/L ratio of 0.02 found in rail cars, trucks or ships already gives a vapor pressure of around 100 kPa. Assuming that this storage tank stands in bright sunlight heating its content to a temperature of 60°C the vapor pressure rises even further to 120 kPa.

The more light ends the transported crude contains the higher these effects will get. This highlights the importance to measure the crude’s vapor pressure under realistic conditions.

Crude Oil Configuration

Measuring live crudes containing high amounts of volatiles requires the use of a pressurized sampling system, such as floating piston cylinders (FPC) or manual piston cylinders (MPC). If such crudes are measured from an open bottle the resulting vapor pressure of this crude will be biased to the real vapor pressure since all volatiles will be lost. eralytics newly developed manual piston cylinder ERAVAP MPC (ASTM D8009) offers an even more comfortable and reliable application for this task. For an easy connection to the instrument, ERAVAP is equipped with a pressure-tight connection inlet for quick fit connectors including an integrated inlet filter. With its built-in high performance shaker motor ERAVAP measures in full compliance with ASTM D6377.

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 Crude directly draws up the sample into the measurement chamber by a piston. Sample take-up of more viscous samples naturally takes longer time until a viscosity where it becomes impractical. Heating up the sample prior to the introduction reduces the viscosity and the filling procedure speeds up. However, during the measurement, the sample sitting in the inlet and outlet tubing will cool down which possibly leads to a blockage of one of the tubes. With the high viscosity module, the inlet, outlet, and all connecting tubes, as well as the inlet assembly, can be heated up to 70°C. This temperature is programmed from the measurement menu of the instrument and actively controls the temperature. This optional module makes ERAVAP the perfect analyzer for challenging samples such as fuel oil or heavy crudes without risking clogging of the equipment.

ASTM D6377 and CCQTA Recommendations

ASTM D6377 allows to use a wide range of different parameters for crude oil vapor pressure testing. Thus it can be tailored to fit the parameters for most conditions. Studies by the Canadian Crude Quality Technical Association (CCQTA), however, showed that the thermal expansion of the samples makes measurements at very low V/L ratios difficult. CCQTA prefers to analyze the V/L ratio curves at a specific temperature to judge the crude oil.

Eralytics' found a solution for the thermal expansion issue in ERAVAP crude and therefore can measure accurate crude oil vapor pressures at V/L = 0.02. Additionally, curve measurement programs at various V/L ratios are available, including the TVP method (True vapor pressure) which calculates the theoretical VPCR at V/L = 0. This makes ERAVAP crude the ideal choice for crude oil measurement applications.

Measurement Procedure

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

• Enter sample ID and operator name
• Select the measurement standard and add additional parameters when necessary
• Place the sample beside the analyzer and put the tubing inside the sample
• 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.