NivuFlow 650
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NivuFlow 650 Multi-Path Ultrasonic Transit Time Flow Measurement

NIVUS - Innovation and high accuracy The NivuFlow 650 is compliant with both ISO 6416 & IEC 60041 and has been developed for accurate flow measurement in open channels, part filled and full pipes and surface water bodies. To meet the highest possible accuracy requirements it is currently possible to utilise the NivuFlow 650 using up to 4 velocity paths, with extension modules up to 32 velocity paths. The NivuFlow 650 operates over the full bi-directional flow range without causing obstruction or head loss where the large array of NIVUS transducer models permits flow measurement across the...

Flow measurement systems at the highest technical level The compact transmitter design can be easily integrated into instrument cabinets using a DIN rail mounting system and is also available with a field enclosure that provides full protection under harsh environmental operating conditions. The transmitter‘s large graphic display allows quick and easy commissioning of the flow metering system. The NivuFlow 650 provides extensive diagnostic options and allows in-depth analysis of operational function on site. The system has been developed using future-proof protocols complete with versatile...

Nivu Flow 650 transmitter The intuitive single handed operation and the bright colour display allow quick, easy and cost-efficient commissioning on site. Additional communication devices or software are not required. Factors influencing the measurement results such as channel shape, varying water levels, skew flow and discharge behaviour are taken into account during flow calculation. The NivuFlow 650 flow calculations are based on the very latest fluidal dynamic models with enhanced diagnostic options to provide detailed analysis of the flow meter operation both on site and via a remote...

Technical Information NivuFlow 750 Protection: IP65, material: Aluminium die-cast Operating temperature -20 °C to +50 °C, max. humidity: 80%, non-condensing Bus cabel for connection between extension box and transmitter type: LiYC11Y 2 x 1.5 mm2 +1 x 2 x 0.34 mm2, outer cable diameter: 8.4 mm ±0.25 mm

How the NivuFlow 650 measures Transit time indirectly calculates flow by measuring velocity and the cross sectional area related to the water level. The general measurement equation is: NivuFlow 650 field enclosure A(h) = cross-sectional area (based on centre values) vA = average flow velocity in cross-sectional area The NivuFlow 650 measurement principle is based on detecting the transit time of ultrasonic signals between two sensors (A and B). The transit time in flow direction t1 is faster than it is against the flow direction t2. The time difference between both transit times is...

Measurements in pipes For full pipe measurement applications with a fully developed velocity profile it is normally sufficient to use a single velocity path measurement (1E1P). However, normally there are distorted flow profiles which have negative effects on the measurement accuracy. Such influences can be compensated by using the NivuFlow 650 in combination with up to 32 measurement paths. The NivuFlow 650 utilises various transducer models depending on the application. For measurement in part full and full pipes special screw-in sensors ensure simple a installation solution. Pipe...

Measurement in open channels Transit time is a well understood and established method for flow measurement in demanding applications without requirement for the construction of a measurement structure such as weir or flume. The NivuFlow 650 has been specifically developed to overcome the inherent problems associated with complex channel shapes, varying water levels and skew flow through our highly flexible velocity path configuration options. Example application using 2 velocity paths (4 transducers) installed underneath a road bridge using rod style sensors.

To meet the highest possible accuracy requirements for both open channel and pipe measurement applications it is currently possible to utilise the NivuFlow 650 using up to 4 velocity paths. With extension modules up to 32 velocity paths are possible. Sensors NIVUS have developed a range of highly accurate acoustic transducers, with both standard and bespoke mounting systems available to ensure the best and most flexible installation options are available for any measurement application

NIVUS - setting exemplary standards With a significant and wide ranging installed base of transit time systems, and utilising the decades of experience amassed by our engineers, technicians and expert staff, NIVUS provide a full range of services starting with initial site assessment, through to design, commissioning, installation and maintenance. Hemisphere sensor Ballhead sensor Wedge sensor

Flow measurement using the hemisphere sensors Taking into account the measurement location, variable water levels and channel profile, the hemisphere sensors were configured within the rectangular channel to provide accurate flow measurement over the full range of flow rates. Installation of hemisphere sensors in a part filled channel. There are 8 hemisphere sensors installed in a crossed path configuration utilising 4 velocity paths, with the upper velocity paths deployed when the water levels exceed the set transducer heights. The transducers are installed using bespoke stainless steel...

Wedge Sensor Universal hemisphere sensor Ballhead sensor rotating clamp Clamp ring ø150 x 4, V2A Screw-in sensor/ plug-in sensor Sensors Measurement Measurement range Channel widths Measurement uncertainty Measurement frequency Protection Operating temperature Cable length Cable type Medium contacting materials ultrasonic transit time principle flow velocity ±15 m/s 0.5 m to 40 m; other widths upon request flow velocity (vaverage) ±0.1 % of measurement value within path 1 MHz; V40: 200 KHz, (other frequencies depending on path length) IP 68 -20 °C bis +50 °C max. 100 m • uninterrupted...