The kobold ovz plastic oval wheel meter is the first volumetric flowmeter on offer in the marketplace, which almost matches the specifications of its bigger brothers - but is less expensive. It allows volumetric flow to be measured dynamically in applications where, for price reasons, flow indicators have been used until recently. Dosing charges can now be measured volumetrically where, for cost reasons, dosing was performed on a time basis up til now. This has been made possible by the use of aluminium / plastic - produced using moulding and forming techniques.
The kobold ovz plastic oval wheel meter is a positive-displacement flowmeter. The measuring element comprises two toothed precision oval wheels, which are driven by the fluid and thus roll together. This rolling motion causes a fixed quantity of liquid to be transported through the meter for every turn of the oval wheel pair.
Permanent magnets / contact makers embedded in the oval wheels allow the rotary motion of the oval-wheel pair to be externally sensed by means of electrical sensors. Sensing with pulse generators produces a fixed impulse / volume ratio, which can be evaluated by series-connected electronics.
The oval-wheel pair is manufactured from plastic materials, and a sophisticated forming technique is used to ensure sustained dimensional stability. Two different plastics and aluminium, which may be combined, are available as housing materials. This means that the flow-housing cover can be produced with transparent plastic to allow the oval-wheel pair operation to be visually observed.
A hall sensor or a pnp or namur inductive proximity switch may be used to sense the rotary motion. A large selection of electrical compatible connections are available, namely cable connections via aluminium and plastic socket outlets, and din standard plugs and connectors.
The new generation of oval wheel meters is very suited for volumetric flow measurements in low-pressure and hydraulic applications, and for all non-aggressive, lubricating liquids. The device is suited for use in four measuring ranges between 0.1 and 40 l/min, with operational viscosities between 10 and 1000 cst, and a pressure drop < 1 bar, even with high viscosities. The flowmeter is suited for wide-ranging application in automation systems.
