LJ20 Propeller-Type Current Meter
Other Products
LJ20 Type Propeller Current Meter
1. Product Introduction
This series of propeller current meters are conventional general-purpose instruments for velocity measurement in river hydrological surveys, used to determine the time-averaged velocity at predetermined measuring points in cross-sections of rivers, lakes, reservoirs, channels, and other water bodies.
This instrument complies with and meets technical standards such as GB/T11826-2002 "Rotor-type Current Meters".
2. Main Technical Specifications
(1) Propeller structure: A pair of left-hand helical curved blades, composed of a paddle column and a flow guide cap, made of PC plastic
(2) Propeller rotation diameter D: 125mm
(3) Propeller hydraulic pitch b: 200mm
(4) Instrument starting speed V0: 0.03m/s
(5) Calibration curve critical speed Vk: approximately 0.13m/s (starting point of the linear formula)
(6) Velocity measurement range V: 0.05~8m/s (experimentally calibrated Vmax=15m/s)
(7) Signal component structure: Magnet—reed switch electronic circuit
(8) Signal revolutions per pulse: 20 revolutions
(9) Calibration curve error: When V ≥ Vk, overall mean square error M ≤ ±1.5%;
When V < Vk, average relative error E < ±3%
(10) Switch contact capacity: Current ≤ 120mA, Voltage ≤ 24V
(12) Instrument continuous operation time: 2 hours (suspended sediment concentration ≤ 10kg/m³, velocity ≤ 5m/s, water depth ≤ 10m)
(13) Instrument operating hydraulic conditions
Water depth range: 0.2~50m; Water temperature: 0~40℃
Suspended sediment concentration: ≤ 50kg/m³
Salinity: ≤ 2g/
| Industry Category | Measurement-Analysis-Instruments |
|---|---|
| Product Category | |
| Brand: | |
| Spec: | |
| Stock: | |
| Origin: | China / Shandong / Weifangshi |