Flow Sensors

CS2 Correlation Pipe Sensor

Part No. CS2-V1

Large measurement range for big pipes

Ultrasonic sensors for flow measurement with very high accuracy in slight to heavily polluted media. For installation in pipes up to 5000 mm diameter

  • Very high accuracy by means 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
  • Particularly suitable for pipe sections starting at 1000 mm diameter

CS2 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 CS2 pipe sensor

  • Channel networks: billing measurement places, flow measurement in large pipe sections
  • Wastewater treatment plants: intake, discharge, activated sludge tank intakes, return sludge, recirculation, surplus sludge, digester discharge and flocculant dosage
  • Industrial wastewater networks
  • and many more



Technical Data

Pipe sensor for installation in pipes with sensor screw joint and retaining element

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



IP 68

  • II 2 G Ex ib IIB 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 (for combi sensors with pressure measuring cell max.1 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 PA 1,5/2,5

Outside cable diameter

8.4 mm ±0.25 mm

Sensor connection

Cable end pre-configured for connection to OCM CF

Sensor types

v-sensor with T-compensation

Medium-contacting materials

Polyurethane, stainless steel 1.4571, PPO GF30, PTFE, PA6 GF30

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

Zero point drift

absolutely stable zero point

Measurement frequency

1 MHz

Measurement range

−100 cm/s to +600 cm/s

Measurement range

−20 °C to +60 °C

Measurement uncertainty

for 0.05≤|V|≤0.5 m/s: E_v=0.5/|V| [%]

for |V|>0,5 m/s: E_v=1 %

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


Tender Specification CS2 Sensor

System Products
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