Pulsar Process Measurement Ltd.
Pulsar Process Measurement Ltd.

Flow Pulse – A major advance in non-invasive flow measurement.


Source: Pulsar Process Measurement Ltd.

Unique, non-invasive clamp-on flow monitor

Easy to install and simple to set-up, Flow Pulse uses an acoustic technique never before seen in flow measurement to deliver reliable results across an amazing range of pipe materials and sizes. At a fraction of the installation cost of an equivalent magflow meter, Flow Pulse delivers repeatable, accurate flow measurement.

Pulsar Process Measurement's Flow Pulse is a compact and cost-effective pipe flow monitor that promises exceptional repeatability, accuracy and simple installation with no down time. Flow Pulse is perfect for monitoring flow rate in fluid distribution systems, for pump efficiency checks, in process plant or sewage pumping stations.

Flow Pulse is a leap forward in flow measurement and in ease of installation - no need to break into a pipe, or to get any engineering involved, just clamp a small sensor to the outside of a pipe and immediately get a reliable, repeatable flow measurement (tools required = one screwdriver). Virtually no installation costs, no interruption to service, clean and simple.

Flow Pulse uses a novel spread spectrum analysis technique never before used in flow monitoring. It introduces a radical new Digital Signal Processing approach for exceptional repeatability:

Ultrasound is fired through the pipe wall at 90 degrees to the flow via a tangentially mounted high-output ceramic, then refracted at angles across the axis of the flow and subsequently reflected from bubbles, particles and vortices in all directions and at a wide range of frequencies. The wide, refracted, ultrasonic beam maximises the ultrasound energy that could be captured from flowing particles. These multiple reflections are received back into the unit via a second crystal.

The mass of data generated is analysed using Flow Pulse’s Refracted Spread Spectrum Analysis (RSSA) digital signal processing platform to derive flow information. RSSA analyses and integrates the received signals over a wide frequency range, then slices them for real-time analysis and flow rate calculation.

Flow Pulse operates in a flow range from as little as 0.3m/s through to 4m/s, with a minimum particle size of 100µ and concentration of 200ppm or above (the equivalent of hard water).


Pipe material can be rigid plastic, stainless steel, mild steel or cast iron. Corrugated pipe is not an issue and even light corrosion will give a good result. Flow Pulse provides repeatability and accuracy of around ±5%. Flow Pulse comes in two versions, one working with pipes up to 350mm diameter, the other operating from 350mm to 1000mm.

RSSA - Highly developed signal analysis

Pulsar Process Measurement have introduced two major innovations with the launch of Flow Pulse - firstly, of course, that the system is non-invasive, and secondly the new way that the mass of flow data is analysed. PPM call it Refracted Spread Spectrum Analysis (RSSA).

RSSA builds on PPM’s track record of excellence in acoustic digital signal processing. PPM’s non-contacting ultrasonic level and open channel flow measurement equipment has revolutionised the way that process and utility engineers view that technology, in large part down to the DATEM echo processing software on board. Similarly, Sludge Finder brought PPM’s technical expertise to bear on the challenge of accurately and reliably measuring sludge blanket interface levels.

Software to suit - Flow Pulse PC

Flow Pulse is accompanied by Flow Pulse PC, software to control, set up and monitor Flow Pulse units. Flow Pulse PC has a clear, simple interface, from which users can see at a glance the flow rate in units of their choice together with the flow velocity. RS232 Modbus connection allows the Flow Pulse to be set up through a straightforward and intuitive set of parameters while real-time flow information can be read and recorded.

Options and Outputs

Flow Pulse will operate as a stand-alone device, requiring 18-24Vdc. It provides a single volt-free programmable relay and a scalable 4-20mA output. Programming is either via RS232 Modbus connection to a PC, or the Flow Pulse can be connected to the optional Flow Monitor, which acts as a power supply, local display and programming unit all in one.

Contact Pulsar Process Measurement to talk through your application and discover more about the amazing Flow Pulse.


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