Propeller flow meter

1.Propeller flow meter product introduction

Propeller flow meters are designed to provide economical and versatile water velocity measurements, including turbulent flows and fluids containing debris.Propeller flow meter (portable flow meter for short) is a general-purpose instrument that measures flow velocity in hydrological tests.It is used to measure the average flow velocity of predetermined measurement points in water cross sections such as rivers, lakes, reservoirs, and canals.

This flow meter complies with relevant national standards such as GB/T 11826-2019 (rotor flow meter) and other relevant national standards.

This flow meter is widely used in hydrological testing, water conservancy survey, farmland irrigation, runoff experiments, etc., and can also be used in hydropower, environmental protection, mining, transportation, geology, scientific research institutes, municipal and other industries to monitor relevant flow velocity or flow.

The portable flow velocity meter is mainly composed of a propeller flow velocity sensor, a flow velocity calculator, and a measuring rod.The complete set of instruments is placed in a high-end aluminum alloy code box.Turn on the signal line to measure the flow rate in each open channel and automatically display the flow rate.

The instrument has a simple structure, lightweight and convenient, power-consuming, complete functions, high automation, stable and reliable, complies with the national open channel flow measurement standard, and is equipped with a 60-degree high-temperature propeller.It is currently a new portable flow rate measuring instrument in China.

2.Propeller flow meter technical parameters:

Speed measurement formula: V=KN/T+C(m/s)(automatic calculation)

Propeller rotary diameter: Ф125mm

Propeller hydraulic pitch b: 200mm (theoretical value)

Starting and rotating speed V0:0.03m/s

Speed measurement range: 0.04-15.00m/s

Flow measurement error: ≤1.5%

Output signal: Magnetic switch contact on and off signal

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

Display: 4×16-bit LCD display

Measurement method: measuring rod positioning measurement (can also measure cable suspension positioning)

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

Power supply: DC 8.4V (rechargeable battery), can work continuously for more than 40 hours after full

3.Propeller flow meter measurement principle:

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

1.Flow rate determination:

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

V: Measuring average flow velocity (m/s) during the flow period

K: Paddle hydraulic pitch

C: Flow meter constant

T: Test flow duration (unit is S)

N: Number of signals in T period

When this instrument is used, K and C are both constants.When measuring the flow, as long as T and N are measured, the flow rate can be calculated.

2.Calculation of traffic:

Flow measurement According to the flow rate area method measured by open channel flow, the flow rate is measured first and then multiplied by the cross-sectional area to obtain the flow rate.