Mass Flow ONLINE - FAQ

What happens during measurement with a vortex meter when the tube vibrates ?

In general, vortex meters are sensible for vibrations and impact shocks. Therefore vibrations and impact shocks should be prevented in the neighbourhood of the meter.

What kind of output pulse is generated from LIQUI-VIEW?

The output pulse of a LIQUI-VIEW is of the "open collector" type.
Instead of outputting a signal of a specific voltage or current, the output signal is applied to the base of an internal NPN transistor whose collector is externalized (open) and available on the wire. The emitter of the transistor is connected internally to the ground pin.

If we supply for instance 24Vdc to the pulse line and we keep the maximum current to 20mA, then we need a "pull-up" resistor of 24(VDC) / 20 (mA) = 1.2 (k Ohm)

Note: if the readout unit is a NPN Open collector receiver, there is no need for a pull-up resistor.

Which liquids can be measured with LIQUI-VIEW ?

All liquids which are not flammable, corrosive or toxic and with a viscosity below 10 cp.

Vortex technology, how does it work ?

A Kármán vortex street is a term for a repeating pattern of swirling vortices caused by the unsteady separation of flow of a fluid over bluff bodies. It is named after the engineer and fluid dynamicist, Theodore von Kármán.

Vortex street animation Vortices creation depending of the fluid velocity

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