Variable area flowmeters can be replaced by the Bürkert analog flowmeter with reduced cost of ownership of up to 60%, says Bürkert.
Variable area flowmeters rely on the process fluid being passed through a (normally) transparent tube containing a float. This tube is tapered and as the flow increases the float in the tube rises so that the variable orifice can allow the flow to pass. This method of flowmetering has been available for many years; however, there are numerous disadvantages. Because the level at which the float stabilises is relative to the flow rate, it is necessary to be able to see the float. If the liquid is dirty or the tube becomes opaque due to dirt, scratches or chemical staining, it is impossible to read. Although stainless steel tubes are available with magnetic couplings to the float, these are expensive. It is also necessary to install these meters in a vertical position and this is not always convenient.
Bürkert Contromatic produce a simple alternative to the variable area flowmeter. This meter is based on the proven Paddlewheel technology and it has a simple analog scale for reading the flow rate in engineering units. The power for the unit is provided by internal batteries having a two-year lifespan.
This flow indicator is simple and cost-effective to install in pipe sizes from 15 to 400 mm in diameter. The pipes can be in any plane provided they remain full whilst the fluid is flowing. There are many variations of this meter for most applications. The display can be remotely mounted and the sensor can be supplied in different materials to suit the application. Externally powered units have digital displays, alarm contacts, flow rate transmission signals and batch control contact outputs.
These meters are supplied complete with batteries and pipe fittings and are factory calibrated and ready to use.
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