Q-Eye PSC portable

portable Pulse-Doppler system 

Q-Eye PSC portable is your companion for temporary flow measurements. For sewage treatment plants flow measurements are primarily installed for internal reasons, for example to control specific plant components with flow dependency or for controlling additives. International regulations for example the EU-Directive for handling municipal waste water require a continuous surveillance of waste water flow. Defective flow measurements on sewage-treatment plants can therefore influence their operation, but there can also be legal or environmental consequences.

As it is often required to carry out the measurements only for a few weeks or months to obtain representative data, HydroVision is offering the mobile version of its Q-Eye PSC flowmeter.

HydroVision_Q-Eye PSC portable doppler flowmeter



1 x velocity
1 x water level

Frequency 1 MHz

velocity ± 5,3 m/s
water level 0,04 – 1,3 m
expandable via optional
hydrostatic sensor


v:   1% ± 0,0025 m/s
h:    1% ± 0,001 m

Cable Length

max. 80 m

Display 4 lines, 20 characters
Keyboard 4 keys

16 GB (internal)



LAN (option)

Ethernet RJ45 (option)


max. 2 x 4-20 mA

Power Supply internal

2 x rechargeable batteries (hot-swappable)

Protection Class IP 67

HPX resin


PDF-Logo brochure for Q-Eye PSC portable / (PDF) 

The flowmeter comes in a robust case ready for use in harsh environments e.g. the use in sewer networks. The instrument can be read out without opening the case by activating WLAN transmission. No cable or software is needed to connect with a laptop, smartphone etc. All components of the flowmeter are battery powered by two redundant rechargeable battery packs. Optionally, a LAN connection is available for the Q-Eye PSC portable.

Event mode

In case of an event, the logging can be set automatically to 1 minute. Variable logging intervals assure maximum information about an exeptional event – while saving power and data capacity under normal conditions.

Ultrasonic air sensor

Q Eye PSC portable application flowmeter pipe waste water

The ultrasonic downlooking sensor provides non-contact level measurements. The sensor deflector plate guarantees minimal dead band and resists condensation. Redundant level measurements in combination with pressure sensor and / or the depth- and velocity sensor.




ultrasonic, downlooking

Range 80- 1200 mm
Accuracy 1% of measuring range
Protection Class IP67
Material Stainless Steel, PBT
Output 4-20 mA

your choice for mobile applications

Q-Eye PSC portable is your choice for mobile applications. The long lifetime as well as the small and watertight housing make it the perfect tool for temporary operations. In addition to water level and flow, the signal quality, battery voltage and the calculated flow are also stored inside the flowmeter.


Profiling Technology

By developing the PSC technology HydroVision managed to improve older Doppler methods like Contious Wave or Pulsed Wave Doppler. When compared against the simple cross-correlation method (determination of specific patterns in the flow) the PSC technology allows for a measurement in considerably more cells with a cell size of only a few milimeters and measures the velocity profile with a much higher resolution.

By means of a special correlation technology in signal processing, it is possible to measure flow velocity profiles very close to the sensor (low water level), as well as in big distances to the sensors (high water level). This makes the sensor suitable for both shallow waters and applications with higher water levels.

In contrast to the Spectral-Correlation method, the simple cross-correlation method does not measure velocity until several cm (5-6 cm) away from the sensor. In addition, the maximum distance is limited to as little as 1 m due to noise in the medium (weak patterns for higher distances). Also, in a sensor based on the PSC method, no complex and vulnerable electronic needs to be built in, making it possible to keep the sensor small and less influenced by temperature fluctuations (due to different extension coefficients of sensor housing and build-in electronic).