The Icon scientific Vapour Pressure Analyzer measures the pressure exerted by vapour in equilibrium above a liquid at a specified temperature and vapour-liquid ratio.
- Easy to use: with an armored glass wipe-clean touch-screen and intuitive multi-lingual graphic user interface.
- Certified to global standards: ATEX, IECEx, TIIS, EAC, and ETL approved to give absolute confidence and peace of mind in hazardous areas and manufactured under an ISO9001:2015 certified Quality Management System.
- Robust and fully explosion proof: no air or inert gas purging required for safe operation in explosion hazard areas. Safety assured: with an alarm for internal sample leakage.
- Highly efficient: with low sample consumption and a sample flow monitor.
- Flexible: with auto validation or calibration options and standard Modbus, 4-20mA, and digital contact outputs.
What does the Vapour Pressure Analyzer do?
The icon scientific Vapour Pressure Analyzer measures the pressure exerted by vapour in equilibrium above a liquid at a specified temperature and vapour-liquid ratio. Vapour pressure is a measurement of volatility, and finds use in gasoline, LNG condensate, crude oil, and liquefied petroleum gas production.
The Vapour Pressure Analyzer uses the piston expansion principle to measure vapour pressure in line with the latest vapour pressure test methods. It can perform single or multiple expansions, and while it normally operates at 37.8°C (100°F) and a 4:1 liquid vapour ratio, its measuring temperature and liquid-vapour ratios can be varied up to 60°C and 4:1. The liquid and vapour volumes are tracked by laser for unparalleled accuracy
How does the Vapour Pressure Analyzer work?
Within the Vapour Pressure Analyzer, the sample flows into a piston-based measuring cell via low dead-volume solenoid valves, and is flushed then isolated for measurement. Within the measuring cell, a resistance thermometer enables the cell temperature to be accurately controlled at the required measurement temperature. A small defined volume of the sample is held in place by the piston, which is moved to achieve the desired vapour-liquid ratio. Once equilibrium is established, the absolute pressure inside the cell is converted into actual vapour pressure as required by the test method being used.
Applications test methods
- ASTM D5191: Vapour Pressure of Petroleum Products (Mini Method).
- ASTM D6378: Vapour Pressure (VPX) of Petroleum products, Hydrocarbons, and Hydrocarbon-Oxygenate Mixtures (Triple Expansion Method).
- ASTM D6897: Vapour Pressure of Liquefied Petroleum Gases (LPG) (Expansion Method).
- ASTM D6377: Vapour Pressure of Crude Oil (VPCRx) (Expansion Method). Now approved by the EPA for environmental considerations and being adopted for all crude oil applications, ultimately replacing ASTM D323 (RVP).
- The Vapour Pressure Analyzer can also perform “True Vapour Pressure” (TVP) analysis by extrapolation of a multiple expansion curve to a user defined Vapour liquid ratio as described in ASTM D6377. The analyzer can also estimate the Gas Oil Ratio (GOR).
- ASTM D323: Vapour Pressure of Petroleum Products (Reid Method).
- ASTM D4953: Vapour Pressure of Gasoline and Gasoline-Oxygenate Blends (Dry Method).
- ASTM D5190: Vapour Pressure of Petroleum products (Automatic method).
- ASTM D5188: Vapour-Liquid Ratio Temperature Determination of Fuels (Evacuated Chamber Method).
- ASTM D5482: Vapour Pressure of Petroleum Products (Mini Method – Atmospheric).
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