LJ20A flowmeter

Purpose and Scope of Application
LJ20A propeller type high current meter is a large-scale river hydrological speed measurement instrument. It can be used in rivers, lakes, channels, reservoirs and other water bodies for various high, medium and low velocity measurements, as well as in power station pressure pipelines and some scientific experiments for high-speed and ultra-high speed measurements.
FEATURES
▲ Extremely wide speed measurement range, and only one propeller can meet various high and low flow velocity measurements
The dynamic sealing performance of the instrument bearing oil chamber is good. At the hydrological station on the Yellow River under high-speed and high sediment concentration conditions, after a flood season of flow measurement, the bearings do not need to be disassembled or washed. The measured maximum height is 4.3m/s, and the maximum sediment concentration is 100kg/m3
▲ The propeller is made of imported high-quality engineering plastics and has excellent performance such as high impact strength, geometric stability, and resistance to atmospheric natural aging. Working for a long time under harsh natural conditions in the wild, the instrument calibration coefficient K remains stable and unchanged
▲ Low speed performance of the instrument - internal friction characteristics, which can be monitored by a flow meter and internal friction torque meter to ensure the low-speed performance and measurement accuracy of the instrument
When measuring with instruments, their installation methods are flexible and diverse, and the directional device structure is reasonable, which can meet the direction of water flow vertically and horizontally
▲ The instrument has good structural strength, firm installation and support, and can withstand high flow velocity impacts of 15m/s. The instrument has stable performance and reliable operation
The whole instrument is streamlined, and the tail balance hammer is built-in, with low water resistance. The instrument has no additional deflection torque, so it can work stably
Main technical parameters
● Speed measurement range: 0.04-10m/s
● Rotary diameter of propeller: Φ 120mm
● Hydraulic pitch of propeller: 200mm
Output signal frequency: 1 signal/20 revolutions per minute
Relative error of verification formula: When V ≥ VK, ＜ 1.5%; When V ＜ VK, ＜ ± 5%