Product Introduction
The LB70 series rotary cup flowmeter is a traditional, vertical axis rotor flowmeter used to measure the average flow velocity at a predetermined measuring point in a certain water crossing section during a certain period of time.
The LB70 series rotary cup flowmeter complies with relevant national standards such as GB/T11826-2002 "Rotary flowmeter".
The LB70 series rotary cup flowmeter is generally suitable for measuring low flow rates (such as small irrigation channels), and can also be used for runoff experiments, hydraulic experiments, etc.
Main technical performance and parameters
1. Rotation diameter of the rotary cup: Φ130mm
2. Spiral cup hydraulic pitch b: 70mm (theoretical value)
3. Starting speed v0: 0.016m/s（LB70-1C）
0.06m/s (LB70-2C, LB70-2D)
4. Critical speed vk: about 0.13m/s
(The actual verification value shall prevail. According to statistical analysis, vk is much smaller than the above value.)
5. Speed measurement range: 0.02m/s～4m/s（LB70-1C）
0.07m/s~5m/s (LB70-2C, LB70-2D)
6. Output signal: on-off signal of switch contacts
7. Signal number/rotor speed: 1/1 (LB70-1C, LB70-2C) (1 signal per 1 revolution)
1/5 (LB70-2D) (1 signal every 5 revolutions)
8. Capacity of switch contacts: DC U≤24V
I≤120mA
9. Service life of switch contacts: ≥ 107 times
10. Relative mean square error of the entire line m:| M | ≤ 1.5% (for v ≥ vk)
11. Relative error δ:| δ | ≤ 5% (used when v<vk)
12. Working water environment: water temperature ranging from 0 ℃ to+40 ℃
Water depth ranging from 0.1m to 100m
Suspended sediment concentration ≤ 20kg/m3
13. Continuous working time: ≤ 12h
14. Storage environment: Temperature -25 ℃ to+55 ℃
Humidity ≤ 90% RH
