HyQuest Solutions’ LVQ-15 and LVQ-35 are sensors for continuous discharge measurement of rivers, open channels and canals with known cross-section proﬁle. The sensors use innovative radar technology to measure velocity, water level and discharge. They enable reliable, non-contact measurement without the need for structural work in the water.

Thanks to the non-contact radar technology the LVQ is not susceptible to contamination, debris or driftwood in the water. Furthermore, the non-contact measurement ensures very low maintenance and fail-safe operation especially during high water or ﬂooding.

The LVQ can be simply mounted on bridges, on the roofs of closed canals or channel superstructures. Depending on the properties of the water surface the device can be installed in a height of 0.5 to 35 m. LVQ is available in two versions:

LVQ-15: water levels from 0 to 15 meters
LVQ-35: water levels from 0 to 35 meters

The measurable velocity range is between 0.10 and 15 m/s. Additionally the direction of ﬂow is detected, enabling the operation in tide inﬂuenced rivers.
Measuring principle

The non-contact radar technology determines the water surface ﬂow velocity using the Doppler frequency shift method and furthermore the water level is established by a travel time measurement. With known cross section proﬁle the discharge Q of the water is calculated.

Non-contact, maintenance-free measurement system
No structural work in the water needed
Fully operating even in ﬂood water situations
Low power consumption enables operation using solar cells
Detection of ﬂow direction
Velocity range of 0.1 to 15 m/s (depending on the ﬂow conditions)

Technology : radar
Medium : for water
Interface : 4-20 mA
Applications : river
Other characteristics : maintenance-free, IP67
Level range : Min.:
Process temperature : Min.: