Showing posts with label ultrasonic. Show all posts
Showing posts with label ultrasonic. Show all posts

Tuesday, February 28, 2017

Non-invasive, Ultrasonic Flowmeters Are Clear Winners in Wastewater Pumping Stations

non-invasive flowmeters on wastewater pumping stations
Non-invasive flowmeters installed on
wastewater pumping line.
Pumping stations are an integral part of each wastewater network. Flow measurement at such stations is critical as the quantities which are fed to the treatment plant have to be monitored.

Conventionally, magnetic inductive flowmeters are used for such measurement tasks. However, due the medium, which is heavily charged with solid matter, these instruments are subject to wear, leading to incorrect readings and subsequent failure.

Non-invasive ultrasonic flow meters prove to be the better measuring solution. Since these meters measure from outside the pipe wall, there is no wear and tear on the meter making them virtually maintenance-free. Furthermore, there is no need to open the pipe for installation, which would result in at least a partial interruption of operation. There isn't a need for multiple workers or heavy equipment for installation. The entire measuring system, consisting of ultrasonic transducers and a measuring transmitter, is easily carried to the measuring location and installed by a single person. There is no disconnection of pipes or flanged joints, unlike when installing a magmeter. Finally, there is no need for block valves to hold back flow during installation, repair, or replacement.

  • Reliable and accurate non-invasive wastewater flow measurement without any wear and tear or measurement drift
  • Extremely easy to set up a measuring point without any impairment of the plant’s normal operation
  • ATEX-certified transducers with protection degree IP68 for use in hazardous areas as well as in flooded chambers
For more information on non-invasive ultrasonic flow measurement, contact Flow-Tech in Maryland at 410-666-3200, in Virginia at 804-752-3450, or online at

Thursday, October 13, 2016

Accurate Measurement of Low Flow In Compressed Air Systems

Plant operators are well aware of the cost associated with continuous delivery of compressed air, a useful medium utilized as an energy source. Large or multiple compressors consume considerable amounts of electric power maintaining system pressure and flow requirements. With extensive piping and countless fittings, there are many potential points of leakage. Scheduling of various production operations can vary the demand for compressed air significantly. Getting control of your compressed air system and reducing operating cost is a noble goal. One of the primary tools needed to manage energy costs will be accurate and reliable flow measurement equipment. Here are some characteristics of flow measurement instrumentation that should prove advantageous:
Portable ultrasonic flow meter with clamp on transducer
Portable Ultrasonic Flow Measurement Instrument

  • Non-invasive measurement from the outer pipe wall that does not add potential leak sources or pressure drop.
  • Availability in fixed or portable configuration.
  • Highly accurate, with paired temperature compensated traceable calibrated transducers
  • Installed without disturbance to piping.
  • Bidirectional measurement
  • Rugged instrument design suitable for any kind of industrial environment
Ultrasonic flow measurement technology can provide all of these characteristics, providing information that enables the operator to make fact based decisions about system design, management, and maintenance. Learn more about how ultrasonic flow meters specifically configured for compressed air system application can help you start reducing your operating cost and developing a higher level of control over your compressed air system. Share your process challenges with a product specialist and work together to build the best solution.

Friday, July 22, 2016

The Transit-Time Difference Method to Measure Flow

Transit-time flowmeter
Transit-time flowmeter
(courtesy of FLEXIM)
The transit-time difference method for measuring flow exploits the fact that the transmission speed of an ultrasonic signal depends on the flow velocity of the carrier medium.

Similar to a swimmer swimming against the current, an ultrasonic signal moves slower against the flow direction of the medium than when in the flow direction.

For the measurement, two ultrasonic pulses are sent through the medium, on in the flow direction, and a second on against it. The transducers are alternatively working as an emitter and receiver.

The transit-time of the ultrasonic signal propagating in the flow direction is shorter than the transit-time of the signal propagating against the flow direction.

A transit-time difference, Δt, can thus be measured and allows the determination of the average flow velocity based on the propagation path of the ultrasonic signals.

An additional profile correction is performed by the proprietary FLEXIM algorithms, to obtain an exceptional accuracy on the average flow velocity on the cross-section of the pipe - which is proportional to the volume flow.

Since ultrasounds propagate in solids, the transducers can be mounted onto the pipe. The measurement is therefore non-intrusive, and thus no cutting or welding of pipes is required for the installation of the transducers.