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

General
Measurement principle	Ultrasonic Cross Correlation with digital pattern detection (flow velocity) Ultrasonic transit time (level measurement) Piezo-resistive pressure measurement (level measurement)
Protection	IP 68
Operating pressure	max. 4 bar (combi sensor with pressure cell max. 1 bar)
Cable lengths	10 / 15 / 20 / 30 / 50 / 100 m pre-configured, can be extended upon request; a pressure compensation element is required if cables longer than 30 m are used with sensors featuring an integrated pressure measurement cell. The compensation element can be used also to connect the extension.
Sensor connection	Pre-assembled cable end for connection to the NF 750 and NF 7550
Medium-contacting materials	Polyurethane stainless steel 1.4571 PPO GF30 PA Optional sensor resistant to chemicals made of PEEK mounting plate made of Hastelloy C-276 mounting plate made of titanium cable with FEP coating
Ex-Approval	II 2 G Ex ib T4 Gb (ATEX) Ex ib IIB T4 gb (IECEX)
Cable types	Combi sensor with pressure measurement: LiYC11Y 2x1.5 + 1 x 2 x 0.34 + PA 1.5/2.5 Sensors without pressure measurement: LiYC11Y 2x1.5 + 1 x 2 x 0.34
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
Outside cable diameter	Combi sensor with pressure measurement: 9.75 mm ±0.25 mm Sensors without pressure measurement: 8.4 mm ±0.25 mm
Sensor types	v-sensor with T-compensation v-sensor with T-compensation and h measurement (water-ultrasound) v-sensor with T-compensation and h measurement (hydrostatic) v-sensor with T-compensation and 2 x h measurement (water-ultrasound + hydrostatic)
Flow velocity measurement
Measurement range	-350 cm/s to +600 cm/s
Quantity of scan layers recorded and computed	max. 32
Measurement uncertainty	< 1 % of measurement value (v > 1 m/s) < 0,5 % of measurement value +5 mm/s (v < 1 m/s)
Zero point drift	absolutely stable zero point
Beam angle	±5 degrees
Level measurement water-ultrasonic sensor
Measurement range	0.05 to 200 cm
Zero point drift	max. 0.75 % of final value (0 – 50 °C)
Measurement uncertainty	standing medium: +/- 0.5 of final value (within a range of 0.05 – 5 m)
Temperature measurement
Measurement range	−20 °C to +60 °C
Measurement uncertainty	±0.5 K
Measurement uncertainty	+/− 2.0 mm or 0.2% of measured range (whichever is greater)
Level measurement – Pressure
Measurement range	0 to 500 cm
Zero point drift	absolutely stable zero point

Specifications subject to change.

Technical Instructions | Correlation Sensors and external Electronic Box (Rev. 10)

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PDF 7 MB

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

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PDF 4 MB

EC type examination certificate sensor type POA, OCL and CS2

EC type examination certificate sensor type POA incl. supplement

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PDF 516 KB

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

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PDF 761 KB

Declaration of Conformity Ultrasonic Active Sensors POA / OCL / CS2

Ultraschall-Aktivsensoren POA / OCL / CS2

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PDF 37 KB

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

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PDF 193 KB

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