Spiral propeller flowmeter - portable spiral propeller flowmeter

Spiral Propeller Flow Meter - Portable Spiral Propeller Flow Meter 2025 (Recommended by Jiucheng) [Recommended Model LS20A] is used to monitor the water flow velocity in rivers, lakes, and other water bodies, providing important data support for environmental protection departments. The speed of water flow can affect the diffusion of pollutants and the self purification capacity of water bodies. Monitoring the speed of water flow can help to timely grasp the pollution status of water bodies, evaluate the diffusion range and trend of pollution, and provide a basis for formulating effective pollution control measures.

1、 Product Introduction

The current velocity and flow meter (referred to as portable current meter) is a universal instrument for measuring the current velocity in hydrometry, which is used to measure the average flow velocity of the time period at the predetermined measuring points in the river, lake, reservoir, channel and other water sections.

This flowmeter complies with relevant national standards such as GB/T 11826-2019 (rotary flowmeter).

This flow meter is widely used in hydrological testing, water conservancy investigation, farmland irrigation, runoff experiments, etc. It can also be applied to monitoring flow velocity or volume in industries such as hydropower, environmental protection, mining, transportation, geology, scientific research institutes, and municipal engineering.

The portable current meter mainly consists of a propeller type current sensor, a current measuring instrument, and a measuring rod. The complete set of instruments is placed in a high-grade aluminum alloy password box. Connect 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, high degree of automation, and is stable and reliable. It meets the national standard for open channel flow measurement and is equipped with a 60 degree high-temperature propeller. It is currently a new type of portable flow velocity measurement instrument in China.

2、 Technical parameters:

Speed measurement formula: V=KN/T+C (m/s) (automatically calculated)

Rotating diameter of propeller: Ø 125mm

Spiral propeller hydraulic pitch b: 200mm (theoretical value)

Starting speed V0:0.03m/s

Speed measurement range: 0.04-15.00 m/s

Flow measurement error: ≤ 1.5%

Output signal: Magnetic switch contact on/off signal

Number of signals/rotor speed: 2/1 (2 signals per 1 revolution)

Display screen: 4 × 16 bit LCD display

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

Temperature range: -25 ℃ -55 ℃, humidity ≤ 90% RH

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

3、 Measurement principle:

This instrument is designed based on the principle of velocity area method for open channel flow measurement. By measuring the velocity, the flow rate Q=V · S (S is the cross-sectional area) can be obtained

1. Flow rate measurement:

When measuring flow velocity, the propeller rotor flowmeter is driven by hydraulic power to rotate, and the built-in signal device generates a speed signal. The flow velocity is calculated by the following formula: V=KN/T+C (m/s) (automatically calculated)

V: Average flow velocity during the flow measurement period (m/s)

K: Hydraulic pitch of propeller blade

C: Constant of flow meter

T: Duration of flow measurement (unit: S)

N: Number of signals during time period T

When using this instrument, K and C are constants. When measuring flow, as long as T and N are measured, the flow velocity can be calculated.

2. Calculation of traffic:

Flow measurement is based on the velocity area method of open channel flow measurement, which first measures the velocity and then multiplies it by the cross-sectional area to obtain the flow rate.