KOBOLD Instrumentation, represented in South Africa by Instrotech – a Comtest Group company, has on offer the compact, cost-effective 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 series 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. The result is a very high linearity over the whole measuring range (0.5-4.5…10-100l/min) with an accuracy of +2.5% of full scale.
Unlike calorimetric flow measurement, its measuring principle works irrespective of the temperature and without time delay and can thus also 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
100l/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 analogue output (4-20mA) are also available. In addition, a programmable compact electronics system is available that includes a digital display, a switch output and an analogue output. Dosing and metering electronics are currently being developed.
The Kobold DVZ vortex flowmeter typically finds application in the areas of coolant monitoring of lasers, welding robots or induction heating systems for:
Monitoring the flow of low viscosity liquids
Measuring of aggressive, high-purity or salty solutions
Unsuitable for abrasive media or media containing a large proportion of fibers
For more information on Kobold’s DVZ vortex flowmeter contact Instrotech on 010 595 1831 or email: sales@instrotech.co.za
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