Flow Sensors

POA Correlation Pipe Sensor

Part No. POA-V2XXR

Medium measurement range for levels up to ca. 1m

Cross correlation sensors for flow velocity and level detection in part filled and full pipes and channels. For installation in pipes

POA flow velocity sensors are suitable for continuous measurement of slight to heavily polluted media. The pipe-shaped sensors are designed for installation in pipes from the outside using a nozzle. Combined with transmitter types such as NivuFlow 750 and an external level measurement the result is a complete flow measurement system.

  • For high-accurate flow measurement of ultrasonic cross correlation method
  • Interference-free connection over long distances through digital signal transmission
  • Cables can be extended without any problems using standard cables
  • Absolutely stable zero point and drift-free
  • Measurement in heavily polluted and abrasive media
  • Easy installation without additional constructions and perfectly matched mounting accessories
  • Installation under process conditions possible
  • Suitable for all channel cross sections

Typical applications for POA pipe sensors

  • Stormwater treatment plants: flow measurements and control of the discharge to the WWTP
  • Wastewater treatment plants: intake, discharge, activated sludge tank intakes, return sludge, recirculation, surplus sludge, digester discharge and flocculant dosage
  • Direct discharge control, infiltration (extraneous water) or leakage detection
  • Industrial wastewater networks
  • and many more



Technical Data
Measurement principle
  • Ultrasonic Cross Correlation with digital pattern detection (flow velocity)
  • Ultrasonic transit time (level measurement)



IP 68

  • 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

Cable lengths

10/15/20/30/50/100 m pre-configured, can be extended upon request

Cable types

LiYC11Y 2 x 1.5 + 1 x 2 x 0.34

Outside cable diameter

8,4 mm ±0,25 mm

Sensor connection
  • Cable end pre-configured for connection to NFP and OCM CF
  • Cable end with plug for connection to PCM 4 and PCM Pro
Sensor types
  • v-sensor with T-compensation
  • v-sensor with T-compensation and h measurement (water-ultrasound)
Medium-contacting materials

Polyurethane, stainless steel 1.4571, PPO GF30, PTFE

Optional: sensor resistant to chemicals made of PEEK, sleeve made of Hastelloy C-276; cable with FEP coating

Flow velocity measurement

Measurement range

-100 cm/s to +600 cm/s

Quantity of scan layers recorded and computed

max. 32

Measurement uncertainty
  • for 0.05≤|V|≤0.5 m/s: E_v=0.5/|V| [%]
  • for |V|>0,5 m/s: E_v=1 %
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

Absolutely stable zero point

Measurement uncertainty

+/− 2.0 mm or 0.2% of the measured range (larger value applies)

Temperature measurement

Measurement range

−20 °C to +60 °C

Measurement uncertainty

±0.5 K

Specifications subject to change.


Technical Instructions | Correlation Sensors (Rev. 09)

Technical instructions for correlation sensors and external electronic box

Installation Instruction | Correlation and Doppler Sensors (Rev. 07)

Installation instruction for save installation 

EC type examination certificate sensor type POA, OCL and CS2

EC type examination certificate sensor type POA incl. supplement

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

Declaration of Conformity Ultrasonic Active Sensors POA / OCL / CS2

Ultraschall-Aktivsensoren POA / OCL / CS2

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

System Products
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