vortex peak digital oxygan flowmeter for high viscosity

A vortex meter is a type of volumetric Flow Meter that makes use of a natural phenomenon that occurs when a liquid flows around a bluff object. 

Vortex flow meters operate under the principle of vortex shedding , where vortices (or eddies) are shed alternately downstream of the object. The frequency of vortex shedding is directly proportional to the velocity of the liquid flowing through the meter.

Vortex flow meters are best suited for flow measurements where the introduction of moving parts presents problems. They are available in industrial grade, brass, or all plastic construction. Sensitivity to variations in process conditions is low and, with no moving parts, wear is relatively low compared to other types of flow meters.

A Vortex Flow Meter is typically made of 316 stainless steel or Hastelloy and includes a bluff body, a vortex sensor assembly, and the transmitter electronics – although the latter can also be mounted remotely (Figure 2). They are typically available in flange sizes from ½ in. to 12 in. The installed cost of vortex meters is competitive with that of orifice meters in sizes under six inches. Wafer body meters (flangeless) have the lowest cost, while flanged meters are preferred if the process fluid is hazardous or at a high temperature.

The main advantages of vortex meters are their low sensitivity to changes in process conditions and low wear relative to orifices or turbine meters. Initial and maintenance costs are also low. For these reasons, they have been gaining wider acceptance among users.

Vortex meters are not generally recommended for batching or other intermittent flow applications. This is because the dribble flow rate setting of the batching station can fall below the meter's minimum Reynolds number limit. The smaller the total batch, the more significant the resulting error is likely to be.

Low pressure (low density) gases do not produce a sufficiently strong pressure pulse, especially if fluid velocities are low. Therefore, it is likely that in such services the rangeability of the meter will be poor and low flows will not be measurable. On the other hand, if reduced rangeability is acceptable and the mete