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Vapor pressure testing

Vapor pressure testing at its best

ERAVAP is the ultimate vapor pressure tester for all types of liquids, from gasoline to LPG, as well as crude oil, solvents, fragrances and polymers. In combination with eralytics’ temperature-controlled U-tube density meter module DENS4052, ERAVAP is the only vapor pressure tester on the market also offering density measurements in full compliance with ASTM D4052 & ISO 12185 (r = 0.00001 g/cm3) in a single, portable analyzer.

Piston Based Measurement

The measurement principle used for the ERAVAP vapor pressure tester series does not need an external vacuum pump. Instead the so-called mini method uses the built-in piston to introduce the sample. The sample is then heated to the measurement temperature and the piston expands the headspace of the measurement cell to the desired vapor-liquid (V/L) ratio.
The most commonly used mini method, ASTM D5191, measures a cooled and manually air-saturated sample with a single expansion step. In contrast ASTM D6378 uses a triple expansion on a sample to expand it in three steps to the final V/L-ratio. The recorded pressures at these three steps are used to calculate the contribution of dissolved gases to the vapor pressure of the liquid. ASTM D6378 therefore gives the absolute vapor pressure of the liquid as the result where as ASTM D5191 outputs sum of the absolute vapor pressure and dissolved gases called total vapor pressure.
This removes any operator bias caused by errors during the air saturation step.

Illustration of the piston-based measurement principle

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

A further ground-breaking innovation for ERAVAP is the optional combination with eralytics temperature-controlled U-tube density meter module DENS4052. This integrated ultra-light density meter module (patented) offers density measurements in full compliance with ASTM D4052 & ISO 12185 (r = 0.00001 g/cm3).

This makes ERAVAP 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”.

  • DENS4052 module inside
  • ERAVAP with Density inside

Quality Control Mode

To make eralytics’ vapor pressure testers even better a quality control (QC) mode is right on the instrument. It allows to monitor various QC samples in parallel.  Quality assurance measurements are performed in full compliance with ASTM D6299. This improvement makes it even easier to continuously verify the ERAVAP’s high performance. To perform efficient quality control, the user can set individual warning levels to each QC sample. If a sample is measured and the results falls outside these limits a warning is automatically displayed. Additionally, QC charts are available to easily identify long term drifts and perform statistical evaluations of results.

The quality control mode of ERAVAP shows the results of the measured sample n-Petane in a predefined range.

Unmatched Temperature Range Meets High Precision

The Peltier elements used in the ERAVAP vapor pressure tester series allow an unmatched temperature range from -20 °C to 120 °C (4 °F to 248 °F) and a pressure range from 0 kPa to 1000 kPa or 2000 kPa, respectively. In addition the V/L-ratio can be adjusted within a range of 0.02/1 to 100/1 to adapt the ERAVAP to all kinds of measurement needs. The use of a self lubricating piston and other state of the art equipment combines excellent performance with simple use and minimum maintenance. Additionally the ERAVAP vapor pressure tester outperforms the standard methods (ASTM D5191 and D6378) in terms of repeatability and reproducibility (r = 0.15 kPa, R = 0.5 kPa) for the entire operating range.

ASTM D6378 curve pentane gasoline

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