CSM Correlation Wedge Sensor
The Mini sensor family provides the best possible sensors to detect lowest flow levels e.g. for infiltration measurement (extraneous water) or indirect discharge measurement. The sensors use the proven ultrasonic cross correlation method patented by NIVUS. This method allows to detect and to indicate flow profiles starting at flow levels as low as a few centimeters. Due to their shape the sensors are particularly suitable for small geometries and help to avoid backwater effects, the risk of build-up and clogging
Measure. Monitor. Repeat.
For better insights, better decision-making and better process performance.
Key Benefits & Features
- Infiltration measurement (extraneous water)
- Influent control
- Billing measurement places
- Discharge constructions
- Precipitation discharge measurements

Typical applications for Mini sensors
- Measurement campaigns in channel networks
- Small WWTPs: intake and discharge
- Industrial wastewater networks
- Particularly suitable for channels featuring low flow levels
Measurements starting at flow levels of 3 cm
Ultrasonic sensors for flow measurement with very high accuracy in slight to heavily polluted media. For installation on channel wall or channel bottom
More info
The Mini sensor family provides the best possible sensors to detect lowest flow levels e.g. for infiltration measurement (extraneous water) or indirect discharge measurement.
The sensors use the proven ultrasonic cross correlation method patented by NIVUS. This method allows to detect and to indicate flow profiles starting at flow levels as low as a few centimeters.
Due to their shape the sensors are particularly suitable for small geometries and help to avoid backwater effects, the risk of build-up and clogging.
| Technical Data – Wedge / Flow Profile Sensor | |
|---|---|
| Measurement principle | Correlation with measurement of the real flow profile |
| Measurement frequency | 1 MHz |
| Protection | IP 68 |
| Ex-Approval | II 2G Ex ib IIB T4 Gb (ATEX) Ex ib IIB T4 Gb (IECEx) |
| Operating temperature | Wedge sensor without hydrostatic level measurement: −20 °C up to +70 °C for up to 15 min operating time −20 °C up to +65 °C when used continuously −40 °C up to +80 °C in Ex Zone 1 Wedge sensor with hydrostatic level measurement: |
| Storage temperature | −30 °C to +70 °C |
| Operating pressure | Max. 4 bar (combi sensor with pressure cell max. 1 bar) |
| Medium-contacting materials | Polyurethane, stainless steel 1.4571, PPO GF30, PA Pressure compensation element (CSM-D only): POM-C, PMMA, PA, stainless steel 1.4571 |
| Flow velocity measurement – Measurement range | −350 cm/s to +600 cm/s |
| Max. Measuring span | Δ 700 cm/s |
| Quantity of scan layers recorded | Max. 32 |
| Zero point drift | Absolutely stable zero point |
| Error limits (per scan layer) | < 1 % of measurement value (v > 1 m/s) < 0.5 % of measurement value +5 mm/s (v < 1 m/s) |
| Beam angle | ±5 degrees |
| Level measurement – Pressure | Measurement range: 0 to 500 cm Zero point drift: max. 0.75 % of final value (0 – 50 °C) Measurement uncertainty: ≤ 0.5 % of final value |
| Temperature measurement | Measurement range: −40 °C to +80 °C Measurement uncertainty: ±0.5 K |
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Thousands of instruments installed and tens of thousands points monitored daily on systems we support.









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