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

  • 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


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.

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



Measurement principle Ultrasonic Cross Correlation with digital pattern detection (flow velocity)

Ultrasonic transit time (level measurement)

Sensor types v-sensor with T-compensation

v-sensor with T-compensation and h measurement (water-ultrasound)
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
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
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
Number of scan layers max. 16
Measurement uncertainty for 0.05≤|V|≤0.5 m/s: E_v=0.5/|V| [%]
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 for 0.05≤|V|≤0.5 m/s: E_v=0.5/|V| [%]
for |V|>0,5 m/s: E_v=1 %
Temperature measurement
Measurement range -20 °C to +60 °C
Measurement uncertainty ±0.5 K

Specifications subject to change.

Technical Instructions Correlation Sensors

Technical instructions for correlation sensors and external electronic box

Installation Instruction for Correlation and Doppler Sensors

Installation instruction for save installation 

EC type examination certificate sensor type POA

EC type examination certificate sensor type POA incl. supplement

IECEx Certificate of Conformity

Declaration of Conformity Ultrasonic Active Sensors POA / OCL / CS2

Ultraschall-Aktivsensoren POA / OCL / CS2

Declaration of Conformity "Ex" - Ultrasonic Active Sensors POA / OCL / CS2

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