Hybrid Flow Measurement
NivuFlow 7550 is a hybrid measurement system which was particularly developed for flow metering in part filled pipes, channels and surface waters. Mainly in difficult applications the flow meter stands out for reliable results thanks to its advantages by using two measurement technologies.
NivuFlow 7550 is a hybrid measurement system which was particularly developed for flow metering in part filled pipes, channels and surface waters. Mainly in difficult applications the flow meter stands out for reliable results thanks to its advantages by using two measurement technologies.
Contactless Radar Flow Measurement
The contactless low-maintenance radar sensor provides reliable operation even at very high discharge velocities with low flow levels. Dynamic hydraulic models for various channel shapes based on varying filling levels enable accurate detection of the real flow rate.
Ultrasonic Flow Measurement as Overflow Sensor
The ultrasonic cross correlation sensor can be used as overflow sensor. In such cases the sensor provides reliable and accurate results in overflow situations where radar sensors cannot be used for measuring. Thanks to the flow profile detection and the detection of sedimentation on the bottom the flow rate is determined very accurately. Information on sedimentation is also considered for further measurements using the radar system.
Ultrasonic Flow Measurement as Redundant Measurement
The ultrasonic sensor can be used as permanent redundant measurement too. Installing the sensor on the side walls above the sedimentation helps to avoid soiling. The detection of local flow velocities covers the entire channel width and guarantees the determination of very accurate flow profiles. Pre-programmed hydraulic models increase the accuracy of the measurement system.
Easy Installation and Handling
Due to DIN rail mounting options the compact transmitter saves space and can be installed easily in control cabinets. Moreover the NivuFlow 7550 is available with a special protected field enclosure for use under harsh ambient conditions. The large graphic display permits quick and easy commissioning of the flow meter system.
NivuFlow 550 provides extended diagnostic options and facilitates in-depth analysis of running processes on site. The transmitter software is in line with current requirements. Future-proof protocols and versatile communication and integration options open many ways for operators to integrate the devices into higher systems such as SCADA or process control systems.
Typical NivuFlow 7550 Applications
| Common | |
|---|---|
| Power supply | 100 to 240 V AC, +10 % /-15 %, 47 to 63 Hz or 9-36 V DC |
| Power consumption | 14 VA typical |
| Enclosure |
|
| Protection | IP 20, IP 68 with optional field enclosure |
| Operating temperature | −20°C to +70°C |
| Max. humidity | 80%, non-condensing |
| Display | 240 x 320 pixel, 65536 colours |
| Range of operation | rotary pushbutton, 2 function keys, menus in English, French and other languages |
| Connection | plug with cage clamp terminals |
| Inputs | up to 7 x 4 – 20 mA, up to 4 x RS 485 |
| Outputs | up to 4 x 0/4 – 20 mA, up to 5 x relays (SPDT) |
| Data memory | 2.0 GB internal memory, flexibly expandable, readout on faceplate via USB stick |
| Communication (optional) | Modbus, HART® |
| Measurement uncertainty | flow (Q): ± 5% typical; ± 2% under reference conditions |
| Measurement principle | radar in combination with ultrasonic crosscorrelation |
Contactless flow metering for long-term measuring in part filled pipes and channels
The Dynasonics® TFX-500w transit time ultrasonic flow meter measures the volumetric flow of clean water in pipes 10 in. or smaller. Its clamp-on design allows the meter to be installed without cutting or tapping the pipe.
The VN2000 Hot Tap Insertion Vortex Flow Meter measures the volumetric or mass flow rate of steam, gases or liquids over a large flow range.
TFXL ultrasonic transit time flow meter measures most clean liquids and liquids with small amounts of suspended solids or aeration, such as surface water or sewage.
