Technical Update

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-the accurate answer for open channel flow Pulsar’s new dBMACH3 transducer works in conjunction with the Pulsar Flow Oracle 160 orthe latest Pulsar Ultra 3 andUltra 5 control units ,in their flow measurement configuration, to deliver non-contacting ultrasonic open channel flowmeasurement to BS3680 when used with a suitable primary measurement device such as a V-notch weir or flume.The dBMACH3 operates at 125kHz. The higher the frequency of the transducer, the better is its resolution and the higherthe accuracy of the resulting measurement. Under the terms of the Urban Waste Water Treatment Directive, certified under the MCERTS arrangments, a system must achieve an overall accuracy of at least ±8%. One important factor in improving accuracy is the siting of the transducer. Flow measurement accuracyis fundamentally related to the distance over which the measurement is made, so it is vitally important that the transducer face is positioned as close to the flow as possible. The unique design of thedBMACH3allows it to be positioned only a few mm above the maximum liquid level .ThedBMACH3 is the first ultrasonic transducer with no blanking distance beyond its length. Add tothis the solar shield that reduces the effect of solar radiated heat, and the dBMACH3is themost advanced, most effective and most accurate ultrasonic transducer for open channel flow measurement.dBMACH3 may bepositioned up to 1000m from its control unit, minimising installation costs through the use of a simple shielded pair interconnection cable. Pulsar’s control units are configured to calculate the flow to BS3680 when used with a suitable primary measurement device. More information on Pulsar’s range of transducers and ultrasonic controllers can be obtained from our web site:www.pulsar-pm.com. bracket (by customer) M20 thread 1” to M20 adaptor sunshield 165mm Specifications: Operating frequency: 125kHzBeam angle: 12º @ -3dBRange: 0.07 - 2.5mAccuracy: Better than ±1mm, resolution: ±0.5mm Blanking distance: 70mm from transducer face (zero from mouth of cone) Operating temperature range: -40ºC to +90ºC; Hazardous area approval: Standard EEx m IIC T6, optional EEx ia IIC T6: OnNPTthreaded versions, FM Approved Class I, Div 1, Group A,B,C & D. Class II, Div 1, Group E,F & G. Class III. Mounting connection 1”BSPor NPT Pulsar Process Measurement Ltd., Oak House, Bromyard Road, Worcester WR2 5HP, United Kingdom. Tel: +44 (0) 870 6039 112, Fax: +44 (0) 870 6039 114, info@pulsar-pm.com, www.pulsar-pm.comPulsar Inc. PO Box 800, Shalimar, Florida 32579, USATel: +1 850 609 1777, Fax: +1 850 651 4777, info@pulsar-us.com, www.pulsar-us.com® Pulsar is a registered trade mark of Pulsar Process Measurement Limited Certificate No: 950136Literature: TU004