LB70 rotary cup flowmeter

The LB70 rotary cup flowmeter is specially developed for measuring open channel flow velocity and flow in the field by hydrological stations, factories and mines, environmental monitoring stations, farmland mixing and irrigation, hydrogeological surveys and other departments.

It mainly consists of a propeller type flow velocity sensor, a flow velocity measuring instrument, and a measuring rod. When used, it can be assembled as a whole and connected to the signal line to measure the flow velocity in each open channel and automatically display the flow velocity. The instrument has a simple structure, is lightweight and convenient, consumes less power, has complete functions, has a high degree of automation, is stable and reliable, and meets the national standards for open channel flow measurement.

Main technical indicators

1. Rotating diameter of propeller: Φ 130mm

2. Spiral propeller hydraulic pitch b: 70mm

3. Starting speed Vo: 0.06m/s (LB70-1C, LB70-2D)

4. Critical speed Vk: approximately 0.13m/s

(Based on the actual verification value, according to statistical analysis, Vk is much smaller than the above value)

5. Flow velocity measurement range V: 0.07-5m/s Signal component structure: Magnetic steel reed switch electronic switch

6. Number of revolutions per signal: 1/1. 1 signal per 1 revolution (LB70-1C), 1/5 (LB70-2D) (1 signal per 5 revolutions)

7. When the relative error of the calibration curve E is V ≥ Vk, E<± 1.5; When V<Vk, E<± 3%

8. Switch contact capacity: current ≤ 50mA, voltage ≤ 6V

9. Working life of reed switch: 70 million cycles

10. Continuous working time of the instrument: 2 hours (suspended sediment concentration ≤ 50kg/m3, flow velocity ≤ 5m/s, water depth ≤ 10m)

11. Instrument working water flow conditions: water depth range: 0.2~50m; water temperature: 0~40 ℃

12. Suspended sediment concentration: ≤ 10kg/m3; Salinity: ≤ 2g/L

13. Display screen: 4x16 bit LCD display

14. Measurement method: Pole positioning measurement (also cable suspension positioning measurement)

15. Power supply: DC8.4V (rechargeable battery), can work continuously for more than 40 hours after being fully charged

Main technical indicators

1. Rotating diameter of propeller: Φ 130mm

2. Spiral propeller hydraulic pitch b: 70mm

3. Starting speed Vo: 0.06m/s (LB70-1C, LB70-2D)

4. Critical speed Vk: approximately 0.13m/s

(Based on the actual verification value, according to statistical analysis, Vk is much smaller than the above value)

5. Flow velocity measurement range V: 0.07-5m/s Signal component structure: Magnetic steel reed switch electronic switch

6. Number of revolutions per signal: 1/1. 1 signal per 1 revolution (LB70-1C), 1/5 (LB70-2D) (1 signal per 5 revolutions)

7. When the relative error of the calibration curve E is V ≥ Vk, E<± 1.5; When V<Vk, E<± 3%

8. Switch contact capacity: current ≤ 50mA, voltage ≤ 6V

9. Working life of reed switch: 70 million cycles

10. Continuous working time of the instrument: 2 hours (suspended sediment concentration ≤ 50kg/m3, flow velocity ≤ 5m/s, water depth ≤ 10m)

11. Instrument working water flow conditions: water depth range: 0.2~50m; water temperature: 0~40 ℃

12. Suspended sediment concentration: ≤ 10kg/m3; Salinity: ≤ 2g/L

13. Display screen: 4x16 bit LCD display

14. Measurement method: Pole positioning measurement (also cable suspension positioning measurement)

15. Power supply: DC8.4V (rechargeable battery), can work continuously for more than 40 hours after being fully charged