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Pulsar Process Measurement Ltd design, manufacture and market level, volume, open channel flow, pipe flow and pump control instrumentation. Our company specialises in non-intrusive measurement, and our technology is used in a wide variety of industries and applications worldwide. By concentrating on the development of ultrasonic level measurement, we believe that Pulsar can be fairly described as the world technology leader in this field. The product range has been designed to provide a full range of alternatives, from single point of measurement installations right through to complex multi-point applications with digital communications. The ultrasonic range has been augmented with other products, so for the water industry, interface monitors for tricky sludge level measurement application have been added together with units that can be used to warn of pump failure. In more general level applications, single point measurement devices are available where continuous level measurement is inappropriate.


Mr Alistair MacKinnon
Cardinal Building, Enigma Commercial Centre
Sandy's Road
WR14 1JJ

Pulsar DUET - bringing harmony to open channel flow measurement

Pulsar Process Measurement Ltd celebrate their tenth anniversary with a completely new take on non-contacting ultrasonic open channel flow (OCM) measurement. Pulsar's DUET takes the technology to a new level of accuracy for this critical measurement with the use of two transducers working in harmony.

Limitations to Accuracy
There has always been a limitation to OCM accuracy, which is that the ultrasonic measurement depends upon the speed of sound, which in turn depends upon the air temperature. This is such a fundamental effect that some manufacturers avoid the issue altogether by quoting accuracy figures that can only be achieved in the lab. In the field, various methods are used to compensate for changes in temperature, though all have limitations and none are perfect.

DUET - a new measurement concept
Pulsar's DUET (Double Ultrasonic Echo Tracking) is a completely new concept, employing two separate transducers mounted at different heights above the flow level within the normal flume or weir Primary Measurement Device (PMD). The transducers emit sound pulses synchronously with the returning signals analysed together. The Pulsar control unit analyses the signal, and because the distance between the two transducer faces is known, the speed of sound at that moment can be calculated extremely accurately. All other effects, including temperature, are irrelevant. The Pulsar control unit then uses this knowledge to dynamically calculate the distance to the liquid surface. The end result - accuracy better than anything the industry has ever been able to offer and finally we have "millimetre accuracy" achievable in the field, transforming the accuracy of open channel flow measurement.

No civil work, extra wiring or complex installation is required to install DUET, Pulsar's standard transducer range is used and best of all, existing Pulsar installations can be retrofitted with the new technology.

For more information please contact:
Keith Flint, Sales & Marketing Director,
Pulsar Process Measurement Ltd
Cardinal Building,
Enigma Business Centre,
Sandy's Rd,
WR14 1JJ
Tel: 0870 6039 112,
Fax: 0870 6039 114,
email keithf@pulsar-pm.com, www.pulsar-pm.com

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