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Working group 1.51 |
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| Liquid Meters | ||||||||||
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 Tasks |
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Pattern Approvals |
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| Volume and mass meters When liquids are delivered or received in commercial transactions (e. g. fuel dispersers at filling stations, water meters in apartments, meters in production lines of the chemical industry), the volume or mass of the liquid transferred has to be determined in order that the sales price can be precisely fixed. Just as manifold as the number of the liquids traded, e. g. · hot and cold water · oil and petroleum products · cryogenic gases · liquid food · liquid chemicals are the types of the volume and mass meters used which are tested and approved for verification in the working group 1.51: · electromagnetic flow meters · reciprocating piston meters · oscillating piston meters · oval gear meters · screw-type flow meters · rotating paddle meters · sliding vane meters · turbine meters · Coriolis mass flow meters · ultrasonic flow meters Supplementary devices Supplementary devices are parts of measuring facilities which are used to determine, display, transfer or process measured values and which are connected to the measuring instrument. In the working group for Liquid Meters, tests and/or pattern approvals on the following supplementary devices are carried out: · pulse generators · remote transmission devices (remote indicators, remote registers) · programmable devices for data processing · measured data memories · pressure and temperature conversion device Measuring Vessels for liquids at rest In addition to testing and approving measuring systems and volume meters, working group 1.51 is responsible for the calibration and approval of measuring vessels and level gauges. Measuring vessels are used in a wide field in form of: · stationary storage tanks · transportable measuring vessels (motor tank cars, rail tank cars) · barrels. A great variety of measuring instruments is used to determine the filling level in measuring vessels. The pattern approval of such instruments approved for verification by working group 1.51 contains, for example: · level gauges based on float method · level gauges with probe · level gauges based on radar measuring method · level gauges based on ultrasonic method · level gauges with capacitive probes Water meters Most of the measuring devices used in commercial transactions of liquids are water meters. In detail this field of task contains pattern approval of · water meters intended for the metering of cold and hot potable water · electronic water meters · electromagnetic flow meters · ultrasonic flow meters |
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Test Facilities |
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Oil meter test facility Within the scope of commercial transactions, about 150 billion liters of oil are measured every year in Germany. Parallel to this, about 120000 liquid fuel dispensing assemblies are verified or certified every year. Sales of such large liquid quantities require liquid meters of the highest accuracy. The PTB`s test facility for oil meters allows metrological tests to be carried out with a measurement uncertainty of less than 0.05 % in a flow range between 8 l/min and 4000 l/min or 0.1 kg/s and 15 kg/s. Moreover, a test facility for small meters with a flow range between 0.06 l/h and 120 l/h is avaiable for different oils. The measurement uncertainties attainable with the test facility lie between 0.1 % and 0.2 % depending on the flowrate and the product used for the tests. |
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| © Physikalisch-Technische
Bundesanstalt Erstellt am: 27.02.2004, letzte Änderung: 27.03.2008, Rainer Engel |
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