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FlowCERT - the most accurate open channel flow system available anywhere
FlowCERT consists of a dedicated control unit, which makes calculations to BS3680 across every regularly used flume and weir type, and offers datalogging and RS485 digital communications. This is coupled with a choice of sensor, either Pulsar’s high-frequency dBMACH3 transducer or their patented DUET.
DUET is a new concept in ultrasonic measurement featuring two transducers mounted on a common frame, one higher than the other. Both transducers fire together, but the echoes returning from the flow surface are only processed at the lower unit. By constantly monitoring the phase difference between the two transducers, DUET dynamically compensates for any changes in the speed of sound between the transducers and liquid surface. The speed of sound varies with temperature, and conventional temperature compensation equipment does not react quickly enough to be really effective. Temperature variations provide the major source of process inaccuracy when using ultrasonic equipment, so by completely removing temperature effects, DUET is a significant breakthrough. In tests, against a temperature variation of more than 30ºC, DUET plus FlowCERT achieved linear measurement accuracies of ±0.5mm.
FlowCERT also offers 32-point linearisation and velocity x area flow calculations where no primary measurement device exists, with the addition of Pulsar’s Speedy velocity sensor. Speedy is available either as a “wedge” sensor to be fitted to the bottom of a channel or pipe, or as a pipe sensor. In both cases the Doppler effect is used to calculate the liquid flow velocity.
Pulsar Process Measurement Limited | Cardinal Building | Enigma Commercial Centre | Sandy's Road | Malvern | Worcestershire WR14 1JJ
Tel: +44 (0) 1684 891371 | Fax: +44 (0) 1684 575985 | e-mail us©2007 Pulsar Process Measurement
