Kobold Instrumentation has introduced the compact vortex flowmeter Model DVZ, used for measuring and monitoring smaller and medium-sized flow of low viscosity, water-like liquids in pipes. This device has impressed in numerous applications due to its reliability and response time. It functions without any mechanical moving parts, using the vortex principle, where a sharp-edged object, the Karman vortex-generator, is installed within the flow duct, making it virtually maintenance-free. This is a considerable advantage over devices based on the variable area or impeller principle. Vortices are created behind the object whose frequency is proportional to the velocity of flow of the liquid. The flow volume can be determined with a high degree of accuracy by measuring the vortex frequency.
Unlike calorimetric flow measurement, its measuring principle works irrespective of the temperature and without time delay and can thus be used in time-critical applications. The measurement process is suitable for practically all liquids with a viscosity similar to water – irrespective of the pressure, temperature, density and electrical conductivity of the medium. Due to its specific operating principle, Kobold’s DVZ flowmeter is especially suitable for measuring aggressive, corrosive or saline solutions. It can also be used for ultrapure media.
The DVZ series covers measuring ranges up to 100 l/min with its different versions. The devices can optionally be equipped with a fixed or rotatable connection. Depending on the version, a switch output (1 A/30 VDC), a frequency output (open collector, PNP) or an analog output (4-20 mA) are also available. In addition, a programmable compact electronics system is available that includes a digital display, a switch output and an analog output. Dosing and metering electronics are currently being developed.
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