MINIVOL LVR Vapor Pressure Tester The Ultimate Volatility Tester for Gasoline
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
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.
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