Usage of DN50 gas turbine flowmeter

Description :

　　This product has explosion-proof and protective functions, with explosion-proof marks of Exd Ⅱ BT6 and Exia Ⅱ CT6, and a protection level of IP65. It is suitable for measuring natural gas, dry coal gas, compressed air, etc. and is widely used in measurement and control systems in the fields of petroleum, chemical, metallurgy, scientific research, etc.

　　1、 Technical parameters:

　　Measurement medium: gas

　　Range: Standard Range: 2.5-4000m3/h Extended Range: 4-6500m3/h

　　Output signal: pulse signal, 4-20mA current signal, control signal. Accuracy level: ± 1.5% R (± 1% R needs to be customized)

　　Medium temperature: -20 ℃ to+80 ℃

　　Explosion proof grade: Exd Ⅱ BT6 or Exia Ⅱ CT4

　　Protection level: IP65

　　2、 Characteristics:

　　Adopting precision bearings specifically designed for imported instruments, with high accuracy and good stability, it can be used without refueling for five years under normal conditions.

　　The carefully designed flow channel structure avoids the flow of air between the bearings and improves the medium adaptability of the turbine flowmeter.

　　The unique reverse thrust structure and sealing structure design ensure the long-term reliable operation of the bearing.

　　The flowmeter head can rotate 180 °, making installation and use simple and convenient.

　　Design a rectifier with excellent rectification performance, with very low requirements for the front and rear straight pipe sections (front ≥ 2DN, rear ≥ 1DN).

　　Adopting low-power high-tech, it can work with both internal and external power sources, and the internal battery can work continuously for more than five years.

　　By using RS485 interface to form a network communication system, automated management can be easily achieved.

　　3、 Principle:

　　Using a turbine for measurement, it first converts the flow rate into the rotational speed of the turbine, and then converts the rotational speed into an electrical signal proportional to the flow rate. Used to detect instantaneous flow and total cumulative flow, its output signal is frequency and easy to digitize. Induction coil and magnet in the picture

　　Fixed together on the shell. When the ferromagnetic turbine blades pass through the magnet, the magnetic resistance of the magnetic circuit changes, thereby generating an induction signal. The signal is amplified and shaped by an amplifier and sent to a counter or frequency meter to display the total accumulated flow rate. Simultaneously, the pulse frequency is converted from frequency to voltage to indicate instantaneous flow rate. The rotational speed of the impeller is proportional to the flow rate, and the rotational speed of the impeller is proportional to the total amount of flow. The output of the turbine flowmeter is a frequency modulated signal, which not only improves the anti-interference ability of the detection circuit, but also simplifies the flow detection system. Its range ratio can reach 10:1, and the accuracy is within ± 0.2%. The time constant of a turbine flowmeter with small inertia and size can reach 0.01 seconds.

　　Gas turbine flow meters are widely used in petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas, and low-temperature fluids.

　　4、 Application scenarios:

　　1. As an industrial control instrument in working conditions where temperature and pressure are relatively stable;

　　2. In working conditions where temperature and pressure are relatively stable, users can calculate the standard flow rate based on the gas equation of the instrument readings.

AfterSalesService :

• User of DN50 gas turbine flowmeter