LZ Metal Tube Variable Area Flow Meter With LCD Display

Product Instruction
Metal tube rotameter measured medium flows through the annulus space between measuring tapper pipe and float from bottom to top, producing differential pressure on  the top and bottom of float to form lifting force. When the lifting force on float is stronger than the weight of float in the fluid, the float will rise, annulus area will also increase. The flow rate of fluid at annulus space will suddenly decrease, the differential pressure on top and bottom of float decreases, the lifting force on the float also decrease till lifting force and the weight of float keep balance, float will stay at a location. The height of float is the flow of measured medium. There’s magnetic steel in the float, while float moves up and down with medium, magnetic field will change with the movement of float.

Product Feature
1. Metal tube rotameter has simple structure, good stability and reliability.
2. Independent of medium’s physical and chemical states such as conductivity, dielectric constants, etc.
3. Applicable for all kinds of medium environment such as corrosive, toxic and explosive one.
4. Interface measurement or level measurement of 2 kinds of medium with different density.
5.Two-wire 4~20mADC signal output, 0.8’’ or 0.56” LED digital display.

Product Structure

Why Choose Metal Tube Variable Area Flow Meter?
In which situation to choose metal tube variable area flow meter instead of glass or plastic tube?
According to the different materials of the tapered tube of variable area flow meter, it can be roughly divided into three categories: Glass tube, plastic tube and metal tube variable area flow meter. Glass tube rotor flowmeter is simple in structure, very cheap cost, easy to be made into an flow sensor for corrosive liquid or gas, has high transparency, intuitive reading, not easy to break, light weight, long life, convenient installation and connection, etc. The plastic tube rotameter has the characteristics of small size, light weight, unbreakable tapered tube and corrosion resistance flow meter.
Metal tube rotameter can measure liquid and gas flow, especially suitable for liquid or gas flow measurement with low flow rate and small flow. It can provide flow rate, total flow display, or 4-20mA output signal to realize flow indication, accumulation, signal transmitting, flow recording, control and alarm, etc. Function.
Today, with the continuous development of measurement technology and the increasing demand for measurement accuracy, metal tube variable area flow meter factory can only fully understand the structural principle of the rotameter, flow calculation, factors affecting the value and correction methods, and the selection and installation requirements of the flowmeter. Choose the correct Metal tube variable area flow meter that best meets your needs to achieve the best measurement results. The author hopes that this paper will bring some help to metrology workers.
Metal tube variable area flow meter construction
Metal tube variable area flow meter is composed of two parts, one is a tapered tube that gradually expands from bottom to top, and the other is a rotor tapered tube placed in the tapered tube, which can move up and down along the center line of the metal tube and is slightly denser than the fluid. The rotor position in the metal tapered tube is transmitted outside the tube through magnetic coupling, etc., and the value is displayed on the panel and indicated by a pointer. It can be made into digital Metal tube variable area flow meter with transmitters to have total value indication and transmitting the flow signals.
Installation of Metal Tube Variable Area Flow Meter
Correct installation is a necessary condition for the metal tube flowmeter to work properly and measure accurately. Generally, the following requirements should be followed:
(1) Metal tube variable area flow meter normally is installed vertically, the fluid flows through the flowmeter from bottom to top, and the verticality is better than 2°, however horizontal mounting variable area flow meter is also available for Silver Automation Instruments.
(2) The inlet should have a straight pipe section that is more than 5 times the diameter of the pipe, and the flow meter is normal 250mm length.
(3)  Appropriately install pipe supports at the installation location.
(4) A bypass pipeline and bypass valve should be installed beside the flowmeter, and a check valve should be installed downstream.
(5) If the measuring fluid is a dirty medium or contains solid impurities, a filter and a regular cleaning device must be installed at the inlet.
(6) If the measurement fluid contains ferromagnetic substances, a magnetic filter should be installed before VA flow meter.
(7) The rotor flowmeter powered by liquid crystal or lithium battery should avoid direct sunlight and high temperature environment (≥65℃).
(8) The working pressure of the measuring gas should not be less than 5 times the pressure loss of the flowmeter.

Contact Us
Sichuan VACORDA Instrument Manufacturing Co., Ltd.
E-mail：    sales@vacorda.com
Tel:            0086-028-87362258
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Address： Guanghua Rd, Qingyang Dist, Chengdu, Sichuan Province, China