LVQ-15 / LVQ-35 Non-Contact Discharge Radar Sensor

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.

 

 

Dimensions and Weight

  • 338 mm x 333 mm x 154 mm, 5.4 kg

Protection Class

  • IP 67

Power

  • Supply: 6 to 30 V
  • Consumption at 12 V: standby approx. 1 mA, with active operation approx. 140 mA
  • Over voltage protection, reverse power protection, lightning protection

Temperature

  • Operating temeperature: -35 to 60 °C
  • Storage temperature: -40 to 60 °C

Interface

  • Digital Interface
    - 1 x SDI-12; 1 x RS 485 or Modbus
    - Transfer rate: 1.2 to 115.2 kBd
    - Protocol: various ASCII-protocols
    - Output: discharge, fl ow velocity, level, quality parameters
  • Optional analogue output (LVQ-15-A): 4 x output 4-20 mA for water level, velocity,
    discharge and AUX

Water Level Measurement

  • Measurement range 0 to 15 m (standard LVQ-15), 0 to 35 m (extended version LVQ-35)
  • Resolution 1 mm
  • Accuracy: +/- 2 mm
  • Radar: frequency 26 GHz (K-Band), opening angle 10°

Velocity Measurement

  • Measurement range: 0.10 to 15 m/s (depending on fl ow conditions)
  • Accuracy: +/- 0.01 m/s; +/- 1 % FS
  • Resolution: 1 mm/s
  • Direction recognition: +/-
  • Measurement duration: 5 to 240 s, measurement interval: 8 s to 5 h
  • Radar: frequency 24 GHz (K-Band), opening angle 12°
  • Distance to water surface: 0.50 to 35 m
  • Necessary minimum wave height: 3 mm

Automatic vertical angle compensation

  • Accuracy +/- 1°, resolution +/- 0.1°