MINIVOL LVR is a tester for the automatic determination of the vapor-liquid ratio temperature. Nonviscous liquids like gasoline, solvents and other highly volatile compounds can be tested with high precision in a range of 20 to 80°C (68 to 176°F). The normal pressure for the test can be adjusted between 50 kPa and 200 kPa.

Features ASTM D 5188 Fully Automatic Wide Range 5 mL Sample Results within 5 Minutes NEW DESIGN MINIVOL LVR vapor pressure tester is a tester for the automatic determination of the Vapor/Liquid-Ratio temperature. Nonviscous liquids like gasoline, solvents and other highly volatile compounds can be tested with high precision in a range of 20 to 80°C (68 to 176°F). The nominal pressure for the test can be adjusted between 50 kPa and 200 kPa (7.25 and 29.01 psi). FULLY AUTOMATIC The instrument performs fully automatically with a sample volume of only 5 mL. The syringe is filled with the sample and inserted into the Luer-lock on the right hand side of the instrument. SIGNIFICANCE AND USE (ASTMD 5188) The tendency of fuel to vaporize in automotive engine fuel systems is indicated by the Vapor/Liquid-Ratio of the fuel. Automotive fuel specifications generally include T(V/L=20) limits to ensure products of suitable volatility performance. Studies of vapor lock behavior are best performed by measuring multiple point measurements at different nominal pressures. TEST METHOD The measuring chamber with a volume of 15 mL is evacuated and heated above the expected temperature. After flushing the chamber with sample and further evacuation, the exact amount of liquid for the first point is injected and the temperature is decreased until the nominal pressure (e.g. 101.3 kPa or 14.69 psi) is observed. The results are calculated according to V/L=(V - v)/v V... Volume of the test chamber v... injected sample volume MULTIPLE POINT MEASUREMENT For multiple point evaluation, the test is started with V/L=100 and the next steps of V/L=80 down to V/L=4 are measured consecutively by adding the respective amount of sample. MAGNETIC STIRRER A magnetic stirrer inside the measuring chamber serves for fast equilibrium and short measuring time. Technical Data Volume of measuring cell: V/L: V/L: Temperature range: Pressure range: Power requirements: Field application: W x H x D: Weight:   15 mL Single point 20 Multiple point 4 to 100 20 to 80°C 68 to 176°F 500 to 2,000 hPa 50 to 200 kPa 7.25 to 29.01 psi 0.5 to 2 atm 100/120/230/240 V AC 50/60 Hz, 65 W 12 V/4A DC (vehicle battery) 196 x 315 x 205 mm 7.7" x 12.4" x 8" 8 kg (18 lb)   Accessories: Vacuum pump required, Printer recommended Principle The test chamber (1) has a volume of 15 mL. A motor driven ball valve (2) for injection and evacuation is located below the temperature controlled chamber. With a precision syringe with Luer-lock (3) the cooled and air saturated sample is drawn in and the syringe is placed into the automatic injection drive. The pressure in the chamber is monitored with a piezoresistive pressure transducer (4). A magnetic stirrer (5) is installed inside the chamber to achieve fast equilibrium. Cooling and heating is performed with a thermoelectric module (6). The temperature of the test chamber is measured with a highly stable Platinum RTD.