Product Introduction
LJ12 series propeller type current meter is a conventional universal instrument for measuring the flow rate in hydrological measurement. It is used to measure the average flow rate of a period of time at a predetermined measuring point in a river, lake, reservoir, channel and other water flow sections, and can also be used to measure the flow rate in pressure pipelines and some scientific experiments.
The LJ12 series propeller flow meter complies with relevant national standards such as GB/T11826-2002 "Rotor Flow Meter".
The LJ12 series propeller type current meter is widely used in hydrological testing, water conservancy investigation, farmland irrigation, runoff experiments, etc. It can also be used in industries or departments such as hydropower, environmental protection, mining, transportation, geology, scientific research institutes, and municipal engineering for monitoring relevant flow velocity or flow rate.
Main technical performance and parameters
1. Rotating diameter of propeller: Φ70mm
2. Hydraulic pitch of propeller b: 120mm (theoretical value)
3. Starting speed v0: 0.05m/s
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: 0.06m/s～8m/s
6. Output signal: Magnetic switch contact on/off signal
7. Signal number/rotor speed: 1/20 (LJ12-1A type) (1 signal every 20 revolutions)
1/1 (LJ12-1C type) (1 signal per 1 revolution)
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 50m
Suspended sediment concentration ≤ 50kg/m3
13. Continuous working time: ≤ 10h
14. Storage environment: Temperature -25 ℃ to+55 ℃
Humidity ≤ 90% RH
