Vortex flowmeters

Proline Prowirl 72/73 flowmeters can be used for the accurate and reliable measurement of steam.

The low-flow cut-off inherent to all vortex flowmeters prevents them from accurately measuring flows below a certain level. The common solution for low flow rates in bigger pipes to date has been to use vortex flowmeters in conjunction with reduction piping - a combination of reducers, straight piping and expanders. Such an installation improves the meter's performance in the low-flow region because it increases velocity locally within the reduced piping section, but adds complexity, pressure drop and cost.

Endress+Hauser has overcome this disadvantage with the launch of its Prowirl R style and S style vortex flowmeters that include a reduction by one or even two line sizes inside a single device - with the same flange-to-flange length as a standard meter. With an integrated reduction of line size in a single, simple device, Proline Prowirl 72F and 73F completely eliminate the need for reducers and expanders. Their increased measuring capabilities in the low-flow range are accompanied by significant time and cost saving.

Endress+Hauser's vortex flowmeters offer a large dynamic measurement range (minimum-maximum) and are offered in a broad variety. Prowirl 72FR and 73FR reduce the line size by one size, ie, DN50 to DN40 and Prowirl 72FS and 73FS reduce the line size by two sizes, DN50 to DN25, for example.

Endress+Hauser's ruggedly-designed flowmeters can withstand high levels of vibration - up to 1G in all axes. Prowirl 73's robust construction ensures it can withstand temperature shocks up to 150 K/s. It also has a high resistance to clogging fluids and has full resilience to the water hammer problems associated with steam applications. Prowirl 73 can accurately measure the volume or mass flow of saturated steam, compressed air, gas and liquids. It directly measures volumetric flow and temperature without the need for an additional thermometer and flow computer. In situations where the pressure fluctuates, Prowirl 73 is able to digitally read in a pressure value using HART, Profibus or Foundation Fieldbus - without a loss in accuracy that is usually associated with analog wiring. Being a two-wire instrument without the need for any additional power supply or wiring, Prowirl 73 can be easily installed. Additionally, when used with non-abrasive fluids, Endress+Hauser assure the lifetime calibration of the device.