Flow Sensors
POA Correlation Wedge Sensor
Part No. POA-V2XXKMedium 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
Description
- For high-accurate flow measurement 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
- 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-shaped sensors are designed for installation on either the channel wall or the channel bottom. 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 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
- Measurement campaigns in channel networks
- and many more
Technical Data
| General | |
|---|---|
| Measurement principle | Ultrasonic Cross Correlation with digital pattern detection (flow velocity) Ultrasonic transit time (level measurement) Piezo-resistive pressure measurement (level measurement) |
| 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) |
| 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) |
| 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. |
| 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 |
| 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 connection | Cable end pre-configured for connection to OCM CF Cable end with plug for connection to PCM 4 and PCM Pro Cable end with plug and pressure compensation element (sensors with pressure measurement cell only) for connection to PCM 4 and PCM Pro |
| 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 |
| Types of construction | - Wedge sensor for installation on channel bottom or channel wall - Pipe sensor for installation in pipes with sensor screw joint and retaining element |
| 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| [%] 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 |
| 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 | 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 |
Specifications subject to change.
Downloads
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
