Vortex flowmeters, also know as vortex shedding flowmeters or oscillatory flowmeters are based on the “ Karmen Vortex street” principle, measure the vibrations of the downstream vortexes caused by the barrier placed in a moving stream. The vibrating frequency of vortex shedding can then be related to the velocity of flow.
Advantages as follows：
1. Simple body construction for easy installation and free maintenance, no need of pressure pipe and 3-valve manifold, reduced possibility of process fluid leakage, blockage and freeze.
2. Vortex flowmeters are the ideal flowmeter in the measurement of gas, liquid, steam and mix/corrosive fluid.
3. High measurement accuracy（ ±1%～±2%）.
4. Suitable for total quantity
measurement, no zero adjustment.
5. In a specific range of Reynolds numbers, the output pluses are unaffected by the fluid, checking in one typical medium suitable to all kinds of others.
limitations and drawbacks：
1. Limited to low Reynolds numbers measurement（Re≥2×104）, means limited to high viscosity, low flow velocity and small size.
2. Requirement for straight run（more than 20D）or set a rectifier.
3.
Sensitive to mechanical vibration, not good at high power vibration place.
4. Low resolution, the bigger size the lower resolution, just can measure below DN300.
Cone shape flow sensor is a differential pressure type flow measurement device based on
Bernoulli principle. Compared to Vortex flowmeter, advantages as follows：
1.Low requirement for straight run, cone body is a rectifier, can be installed in the place without straight run.
2. Wide range of pipe diameter can be more than 15mm~3000mm.
3. Pipe Vibration just influence little on measuring accuracy
4. Meet lower flow velocity by adjusting ß ratio range.
5. Meet high pressure grade placement（ANSI2500/PN42MPa）.
Of course, cone shape flow sensor is just a primary measurement element, should match differential pressure transmitter signal and combine with pressure and temperature transmitters to collect signal, so it costs a little higher than Vortex flowmeter.
