Overview

LWGY series turbine flow sensor (hereinafter referred to as the sensor) is based on the principle of torque balance and belongs to the speed type flow meter. The sensor has the characteristics of simple structure, light weight, high precision, good repeatability, sensitive response, convenient installation, maintenance and use. It is widely used in petroleum, chemical, metallurgy, water supply, papermaking and other industries. It is an ideal instrument for flow measurement and energy saving.

The sensor is used in conjunction with the display instrument. It is suitable for measuring liquids that are not corrosive to stainless steel 1 Cr18Ni9Ti, 2Cr13, corundum Al203 and hard alloy in closed pipelines and have no impurities such as fibers and particles. If it is matched with a display instrument with special functions, it can also carry out quantitative control, excessive alarm, etc. The explosion-proof type (ExmllT6) of this product is selected and can be used in environments with explosion hazards.

The sensor is suitable for the medium whose viscosity is less than 5 × 10-6m2/s at the working temperature. For the liquid whose viscosity is greater than 5 × 10-6m2/s, the sensor should be used after the solid liquid calibration. If the user needs to use a special form of sensor, can negotiate the order, need explosion-proof sensor, in the order to explain.

Structural features and working principle

(1) Structural features

The sensor is a hard alloy bearing thrust type, which not only ensures accuracy and improves wear resistance, but also has the characteristics of simple structure, firmness and convenient disassembly and assembly.

(2) Working principle

The fluid flows through the sensor housing. Because the blade of the impeller has a certain angle with the flow direction, the impulse of the fluid makes the blade have a rotating torque. After overcoming the friction torque and fluid resistance, the blade rotates. After the torque is balanced, the rotating speed is stable. Under certain conditions, the rotating speed is proportional to the flow rate. Because the blade has magnetic permeability, it is in the magnetic field of the signal detector (composed of permanent magnetic steel and coil), and rotating blade cutting the rotating blade cutting magnetic field, the magnetic flux of the coil is periodically changed, so that the electric pulse signal is induced at both ends of the coil. This signal is amplified and shaped by the amplifier to form a continuous rectangular pulse wave with a certain amplitude, which can be transmitted to the display instrument to show the fluid Instantaneous flow or total amount. Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow Q of the fluid flowing through the sensor, and the flow equation is:

Where:

f-pulse frequency [Hz];

k-instrument coefficient of sensor [1/m3], given by calibration sheet;

Q-instantaneous flow rate of fluid (under working condition)[m/h];

3600 the conversion factor at one second.

The instrument coefficient of each sensor shall be filled in the verification certificate by the manufacturer, and the k value shall be set in the matching display instrument to display the instantaneous flow rate and cumulative total amount.

Basic parameters

Medium temperature:-20~120 ℃. Ambient temperature:-20~65 ℃.

Power supply: voltage: 24VDC, current: ≤ 10mA.

3.6V/0.3mA on battery power. 485 communication current increases by 0.6mA. Transmission distance: the distance from the sensor to the display instrument can reach 1000m.

Selection

Flow range and withstand voltage class

Overall dimension

Flow range and withstand voltage class

Factory display

Honor Show

Exhibition style