Flow Sensors

POA Correlation Wedge Sensor

Part No. POA-V3XXK

Medium measurement range for levels up to ca. 1m

Ultrasonic sensors for flow measurement with very high accuracy in slight to heavily polluted media. For installation on channel wall or channel bottom

[Translate to English:] POA Keilsensor für Durchflussmessung mit integrierter Höhenmessung verschmutzten Medien.

[Translate to English:] POA Keilsensor zur Ermittlung des genauen Fließprofils

For high-accurate flow measurement by means of ultrasonic cross correlation method
Interference-free connection over long distances through digital signal transmission
Cable extensions over several 100 metres with standard cables possible without any problems
Absolutely stable zero point and drift-free
Measurement in slightly to heavily contaminated media
Easy installation without additional constructions and perfectly matched mounting accessories
Fastening by means of screws or various optionally available fastening systems
Installation under process conditions possible
Suitable for all channel cross sections
The tailored selection of sensor constructions ensures the best possible solution for each application

POA flow velocity sensors are suitable for continuous measurement of slight to heavily polluted media.The wedge sensors are designed for mounting on channel walls, on the channel floor and on the inner walls of large pipes. In combination with transmitters such as NivuFlow 750 or NivuFlow and with level measurements integrated in the sensor or external level measurements, they form a complete flow measurement system.

Typical applications for POA wedge sensors

Wastewater treatment plants: intake, discharge, activated sludge tank intakes, return sludge, recirculation, surplus sludge, digester discharge and flocculant dosage
Permanent measurements on stormwater treatment facilities such as stormwater overflow tanks, rainwater sedimentation and retention tanks
Direct discharge control, infiltration (extraneous water) or leakage detection
Industrial wastewater networks
and many more

Allgemein
Measurement principle	Ultrasound Transit Time (Level Measurement) Piezoresistive Pressure Measurement (Level Measure-ment) Correlation with measurement of the real flow profile
Measurement frequency	1 MHz
Protection	IP 68
Ex-Approval	II 2 G Ex ib T4 Gb (ATEX) Ex ib IIB T4 gb (IECEX)
Operating temperature	−20 °C to +50 °C −20 °C to +40 °C if using the sensors in Ex Zone 1
Storage temperature	−30 °C to +70 °C
Operating pressure	max. 4 bar (combi sensor with pressure cell max. 1 bar)
Sensor types	Flow velocity sensor with v-measurement by cross-correla-tion and temperature measurement to compensate for the influence of the latter on the speed of sound Combi sensor with velocity sensor by cross-correlation, level measurement using water-ultrasound and tempera-ture measurement to compensate for the influence of the latter on the speed of sound Combi sensor with velocity sensor by cross-correlation, level measurement using pressure and temperature meas-urement to compensate for the influence of the latter on the speed of sound (only for wedge sensor) Combi sensor with velocity sensor by cross-correlation, level measurement using water-ultrasound and redun-dantly using pressure as well as temperature measure-ment to compensate for the influence of the latter on the speed of sound (only for wedge sensor)
Medium-contacting materials	Polyurethane, stainless steel 1.4571, PPO GF30, PA Option: chemical-resistant sensor made of PEEK, Hastelloy C-276 mounting plate; titanium mounting plate; cable with FEP coating
Flow velocity measurement
Measurement range	-350 cm/s to +600 cm/s
Max. Measuring span	Δ 700 cm/s
Quantity of scan layers recorded and computed	max. 32
Zero point drift	absolutely stable zero point
Error limits (per scan layer)	< 1 % of measurement value (v > 1 m/s) < 0,5 % of measurement value +5 mm/s (v < 1 m/s)
Minimum filling level	6,5 cm
Beam angle	±5 degrees
	45°
Level Measurement - Water-Ultrasound
Measurement range	0 to 200 cm; minimum absolute measurable height 5 cm
Zero point drift	Absolutely stable zero point
Measurement uncertainty	< ±2 mm
Temperature measurement
Measurement range	−20 °C to +60 °C
Measurement uncertainty	±0.5 K
Level measurement – Pressure
Measurement range	0 to 500 cm
Zero point drift	absolutely stable zero point
Measurement uncertainty	< 0.5 % of final value
Temperature Measurement
Measurement range	-20 °C to +50 °C
Measurement uncertainty	±0.5 K

Specifications subject to change.

Technical Instructions | Correlation Sensors and external Electronic Box (Rev. 12)

download file
PDF 7 MB

Mounting Instruction | Correlation and Doppler Sensors (Rev. 08)

download file
PDF 4 MB

EC type examination certificate sensor type POA, OCL and CS2

EC type examination certificate sensor type POA incl. supplement

download file
PDF 516 KB

IECEx Certificate of Conformity "Sensors type POA, OCL and CS2"

download file
PDF 761 KB

EU Declaration of Conformity | Ultrasonic Active Sensors POA / OCL / CS2

download file
PDF 37 KB

EU Declaration of Conformity | “Ex” Ultrasonic active sensors POA / OCL / CS2

download file
PDF 193 KB

MCERT | NivuFlow 750 (incorporating POA-K sensor) Echo Profile Flowmeter

download file
PDF 167 KB

Haven't found the appropriate product?

You haven’t found the right product? Then use our application configurator – it will get you to the right product step by step.

Go to configurator

Individual Offer / Questionnaire

Also for your individual measurement spot we support you gladly. Please fill in our questionnaire.

Download questionnaire

Product Consultation

You want to have best information about our products? Our experts will gladly develop together with you the best system solution for your application.

Service hotline

+49 7262 9191-794

Send message

Service

You have questions about your NIVUS products in use? Our service hotline will readily support you.

Service hotline

+49 7262 9191-955

Send message