WK-LWGY liquid turbine flowmeter

Summary:

The 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 instrument. Sensors have the characteristics of simple structure, lightweight, high accuracy, good repeatability, sensitive response, and easy installation, maintenance, and use. They are widely used in industries such as petroleum, chemical, metallurgical, water supply, and papermaking, and are ideal instruments for flow measurement and energy conservation.

Sensors and display instruments are used in conjunction, suitable for measuring liquids in closed pipelines that do not corrode stainless steel 1Cr18Ni9Ti, 2Cr13, corundum Al2O3, hard alloys, and have no impurities such as fibers or particles. If matched with display instruments with special functions, quantitative control, over limit alarm, etc. can also be performed. The explosion-proof type (ExmIIT6) of this product can be used in environments with explosive hazards.

The sensor is suitable for media with viscosity less than 5 × 10-6m2/s at operating temperature. For liquids with viscosity greater than 5 × 10-6m2/s, the sensor needs to be calibrated with real liquid before use.

If users require special forms of sensors, they can negotiate to place an order. If explosion-proof sensors are needed, they should be explained in the order.

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 easy disassembly and assembly.

(2) Working principle

The fluid flows through the sensor housing. Due to the angle between the blades of the impeller and the flow direction, the impulse of the fluid causes the blades to have a rotational torque. After overcoming the friction torque and fluid resistance, the blades rotate. After the torque is balanced, the speed stabilizes. Under certain conditions, the speed is proportional to the flow rate. Due to the magnetic conductivity of the blades, they are in the magnetic field of the signal detector (composed of permanent magnet and coil). The rotating blades cut the magnetic field lines and periodically change the magnetic flux of the coil, causing electrical pulse signals to be induced at both ends of the coil. This signal is amplified and shaped by the amplifier, forming a continuous rectangular pulse wave with a certain amplitude, which can be transmitted to the display instrument remotely to display the instantaneous flow rate or total amount of the fluid. Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow rate Q of the fluid flowing through the sensor, and the flow equation is:

In the formula:

F - Pulse frequency [Hz]

K - the instrument coefficient of the sensor [1/m3], given by the calibration sheet. If [1/L] is used as the unit

Q - Instantaneous flow rate of fluid (under working conditions) [m3/h]

3600- Conversion factor

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

Basic parameters and technical performance:

(1) Basic parameters:

DN50-DN200 caliber sensors are flange connected, with a maximum working pressure of 1.6Mpa;

Sensors with diameters ranging from DN4 to DN10 are equipped with front and rear straight pipe sections.

Our company can provide front and rear straight pipe sections for sensors with a diameter of DN15 or above.

(2) Medium temperature:-20～+120℃.

(3) Environmental temperature:-0℃～+55℃.

(4) Power supply:Voltage:+5-24VDC, Current: ≤ 10mA

(5) Transmission distance:The distance from the sensor to the display instrument can reach 1000m