Vane flow meter
The term vane flow meter is understood to be a hermetically sealed flow sensor, which has an embedded vane as its core and is set in a rotary motion by the respective flow medium.
function
The rotary movement of the impeller is transmitted without contact and without any reaction to a magnetic field -controlled pulse generator attached to the housing . This converts the rotary movement into a frequency signal proportional to the flow. The downstream evaluation electronics generate the signal either as a display, analogize it (0 or (4) -20 mA, 0-10 V), count the measured values or can also be used to switch limit contacts.
Impeller technology has proven itself millions of times around the world for measuring and monitoring the flow of various media through pipelines. The modular design of the impeller flow meters makes them universally usable, inexpensive and space-saving in use.
However, the evaluation electronics must be adjusted and matched to the transducer. Retrofitting for other measuring ranges is possible at any time on site with simultaneous readjustment with a comparison device.
Applications
Vane flow meters are used to measure and monitor liquids. Due to its compact design, the measuring device can also be used on machines with limited space. The large number of options for evaluating the impulses gives the system a wide field of application.
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Simple impeller meters, on the other hand, are used as house water meters and apartment water meters, but also serve as a volume measuring unit for smaller heat meters in the hot water version .
Types
Versions in plastic , brass or stainless steel are offered depending on the manufacturer. Local display with and without alarm contacts, trend display, pulse, switch or analog output are available as options.
Flow indicator, flow monitor
A simplified form is not used for measuring, but only for monitoring flow in systems or in the laboratory - for example through a cooling water line of a distillation cooler - with a simple look. Versions can contain a signal red impeller in the shape of a Kaplan turbine or mill wheel, or they can have a colored bead with a density similar to that of the (transparent) liquid, which circulates in an annular channel when the tangent channel is flowed through.
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- Measuring equipment practice; Functions and use of modern measuring devices; Martin Bantel, published September 2004, 387 pages, Hanser Fachbuchverlag
- Karl Walter Bonfig: Technical flow measurement with special consideration of novel flow measurement methods , 3rd edition, Vulkan-Verlag GmbH, Essen, 2002