Area-velocity flowmeters make it possible to reliably measure flow in any part-filled pipes or in open channels without weirs/flumes.
Industry is often faced with the problem of measuring flow in an open channel. The conventional solution is a weir or flume, but these are often expensive, time-consuming to build, and disrupt plant operations. An ultrasonic area-velocity flowmeter is a suitable solution. This consists of a streamlined sensor mounted near the bottom of the channel which measures flow velocity and liquid level. These measurements, combined with the description of the geometry of the channel, give volumetric flow rate. The same procedure applies equally in part-filled pipes.
Flow velocity is measured by a probe which transmits ultrasound into the liquid to create a 'zone' of inspection. Bubbles and solids carried through this zone by the liquid flow reflect ultrasound back to the probe. Sophisticated electronics analyse the signals and determine the flow velocity. Typically, velocities from 0,5 to 5 m/s can be measured with a resolution of 1 mm/s.
The liquid level is measured using a miniature pressure transmitter connected to the sensor (or any other level measurement available). The flowmeter contains predefined profiles, eg circular, elliptical or rectangular. In addition, the user can capture the channel cross-section through data entered or diagrammatically. The electronics calculates the cross-sectional area of the liquid from the liquid level measurement and the section profile stored. Volumetric flow rate is calculated using the instantaneous velocity and cross-sectional area.
The system displays flow velocity, flow rate and totalised flow. Analog outputs transmit flow information and opto-isolated switches can be used as alarms or to transmit flow information. The integral datalogger stores all measured and calculated information for downloading onto a PC for graphing or analysis. Reliable and quick to install, these ultrasonic area-velocity flowmeters have found wide application internationally, typically for effluent, wastewater, irrigation channels and flow-balance applications.
Radiometric density measurements Mecosa
Flow Measurement & Control
Radiometric density measurements are used wherever conventional measurement techniques fail. Successful applications can be found in a wide variety of industries, especially where harsh process environments and difficult measuring conditions prevail.
Read more...Battery-powered magmeter
Flow Measurement & Control
The RWEM/D battery-powered electromagnetic flow meter from Royce Water Systems is ideal for water and wastewater systems located at remote sites.
Read more...Precise process and maximum savings with VEGABAR VEGA Controls SA
Flow Measurement & Control
Accurate measurementsof differential pressure is crucial for safety, efficiency and optimising operational processes. For over 40 years, VEGA has supplied industry-leading pressure measurement solutions, establishing itself as a trusted expert with a proven track record in sensor technology.
Read more...Innovative solutions for low flow dosing with high precision Mecosa
Flow Measurement & Control
n the food, pharma, and chemical manufacturing industries, precision and efficiency are of utmost importance. Bronkhorst High-Tech has developed a flexible solution that meets today’s requirements for highly accurate dosing, whether continuous, in ratio, or in batches.
Read more...Battery-powered magmeter
Flow Measurement & Control
The RWEM/D battery-powered electromagnetic flow meter from Royce Water Systems is ideal for water and wastewater systems located at remote sites.
Read more...Smart technology for municipal services VEGA Controls SA
Flow Measurement & Control
A new wave of smart technologies has emerged from VEGA Instruments, promising a revolutionary impact on the efficiency and dependability of municipal services.
Read more...Sustainable journey with hydrogen Mecosa
Flow Measurement & Control
Bronkhorst High-Tech, the Dutch leader in flow measurement and control, has been focusing on hydrogen applications in the renewable energy market for some time, and for good reason.
Read more...Optimise sludge treatment and reduce operational costs Endress+Hauser South Africa
Flow Measurement & Control
The Endress+Hauser inline measuring devices, the Proline Teqwave MW 300 and the Proline Teqwave MW 500, determine the total solids content of wastewater directly through microwave transmission.
Read more...Plant signal conditioning Omniflex Remote Monitoring Specialists
Flow Measurement & Control
Often, plant managers have a deep understanding of all the key operational challenges facing their facility, and have a broad knowledge of the instrumentation that can help solve them. However, they might not always be aware of the latest innovations that can make their lives even easier.