What is Metal Tube Flow Meter?

LZ series metal tube flow meter, also known as metal rotor flowmeter. Metal tube flow meter consists of a measuring tube and side indicator, the field indicator can also be retrofitted with an electric device, suitable for liquid gas, and steam measurement. Stable flow measurement is also possible at high pressures and extreme temperatures.

Metal tube flow meter units are available in a variety of tube sizes and configurations. Metal tube units are available from DN 15 to DN 200.

What Is Metal Tube Flow Meter

Metal Tube Flow Meter Features

  • All metal construction, strong and stable.
  • Short strokec compact structure.
  • Low pressure loss design.
  • New style magnetic coupling structure ensures that the signal transmission is more stable.
  • Magnetic filter can be added as customer requirements.
  • Thermal insulation or tracing heat jacket.
  • Used in the gas and liquid measurement in all industries. The measurment parts can adopt different materials to be suitable for different medias.
  • Suitable for harsh environment and seriously corrosion media. Having good heat resistance and pressure resistance.
  • Intelligent dual-line LCD display,on site instant/cumulative flow display and back light as options.
  • Two-wire systemc batteryc alternating current can be choosed to supply the power.
  • With data recoveryc data backup and powerfail protection functions.

Read More about: Digital Rotameter

Metal Tube Flow Meter Benefits

  1. Metal tube rotameter gives full play to its advantages in small diameter, low flow rate of the medium flow measurement.
  2. Simple structure, reliable operation, wide range of applications, accurate measurement, easy installation. The product is widely used in chemical, food, pharmaceutical and other industries.
  3. Rotameter flowmeter has ordinary type and anti-corrosion type. The above two types are further divided into field indication type and electric remote transmission type.
  4. If the measured medium is easy to crystallize or freeze. Can also use metal rotor flowmeter with steam tracing.
  5. If the measured medium contains magnetic objects. Can be installed at the entrance of the flowmeter magnetic filter. Its material is the same as the corresponding flowmeter material.
  6. The overall structure of the metal tube rotameter is made of metal. So it is more sturdy, not easy to be damaged by external factors. It can withstand high temperature of 400℃, and has the characteristics of explosion-proof and anti-corrosion.
  7. Used for gas and liquid measurement in various industries, the measuring part can be made of different materials to adapt to different media conditions.

Extended Reading: What is difference between rotameter and flow meter

Metal Tube Flow Meter-Variable Area Flow Meters Principle

A Metal Tube Flow Meter is a variable area flow meter. It consists of measuring tube, float, indicator, process connection, and so on.

Rotameter flow meter working principle

When the measured fluid passes through the annulus formed by the cone and floats from the bottom to top.

The differential pressure produced at the upper and lower ends of the float forms the force for the float to rise.

When the rise of the float is greater than the weight of the float immersed in the fluid. The float rises.

The annulus area increases accordingly. The fluid velocity in the annulus drops immediately.

The differential pressure at the upper and lower ends of the float is reduced. The lifting force acting on the float also decreases.

Until the rising force equals the weight of the float immersed in the fluid, the float will stabilize at a certain height.

The height of the float in the tapered tube and the flow rate through it correspond to each other.

Extended reading: Beginner’s Guide: Variable area flow meter

Metal Tube Flow Meter Applications

Metal tube rotor flowmeter Mainly applicable to.

  • Suitable for small diameter low flow rate gas, liquid and steam flow measurement.
  • Magnetic coupling principle no leakage resistant to high pressure.
  • High temperature resistance, up to 450 ℃.
  • Subject to certain viscosity, not suitable for measuring high viscosity media.
  • When the flow rate exceeds 100m3 / h water flow, the pressure loss is large.
  • Mostly used for process control instrumentation, accuracy 1%, generally 1.5%, range ratio 10:1.
  • Intrinsically safe explosion-proof and explosion-proof type are all available, suitable for dangerous occasions.
  • Pointer type, battery type, two-wire type, 220V AC power supply and other forms are available. 
  • Suitable installation method is vertical installation of the lower inlet and upper outlet.
  • Measuring high temperature and low temperature (-30 ℃ below) media, the use of jacket type
  • Not suitable for measuring pulsating media flow (such as metering pump outlet).
  • For the gas this table without temperature and pressure compensation, need to be considered separately.
  • For more than one meter intensive installation or carbon steel process pipeline passing near the meter, to maintain a distance of more than 100mm from the meter to avoid magnetic interference.
  • For containing a large number of ferromagnetic particles media flow measurement, to be installed in front of the instrument magnetic filter, and regular purging.
  • Metal pipe rotameter for the occasion of straight pipe section requirements are not high, generally for the first 5D after 250mm can be.

Extended reading: Crude Oil Measurement – Radar Level Meter Measuring Vaulted Buffer Tank

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Steam can be measured using a metal pipe rotameter. Steam temperatures are above 200 degrees Celsius, and metal pipe rotameter can measure media up to 400 degrees Celsius.

The main measuring element of the glass tube rotameter is a vertically mounted conical glass tube and a float that can move up and down inside.

When the fluid from the bottom up through the conical glass tube, in the float between the upper and lower pressure difference, the float in this differential pressure under the action of rising. When the rising force, the buoyancy force and viscous force on the float is equal to the gravity of the float, the float is in equilibrium position.

Therefore, the flow of fluid through the glass rotameter and the float rise height. That is, there is a certain proportional relationship between the flow area and the glass rotor flowmeter. The float position height can be used as a measure of flow.

The flow detection element of the rotameter is composed of a vertical tapered tube that expands from bottom to top and a float group that moves up and down along the axis of the tapered tube. Below, I will give you a specific introduction to the classification of rotameters.

Glass rotameter:

Glass rotameters are mainly used in various departments such as the chemical industry, petroleum, light industry, medicine, fertilizer, chemical fiber, food, dyes, environmental protection, and scientific research. Used to measure the flow of single-phase non-pulsating (liquid or gas) fluids. The anti-corrosion glass rotor flowmeter is mainly used for the detection of corrosive liquid and gas medium flow. Such as strong acid, strong acid, oxidant, strong oxidizing acid, organic solvent, and other corrosive gas or liquid medium flow detection.

Extended reading: Gas Rotameter Tips

Plastic tube rotameter:

The main parts such as the liquid plastic tube rotameter cone tube are made of AS, ABS plastic. Has relatively good corrosion resistance. The product also has the characteristics of reasonable structure, small size, lightweight, and the tapered tube is not easily broken. The plastic tube rotor flowmeter can be widely used in chemical, environmental protection, food, and other industrial sectors.

Plexiglass rotameter:

Plexiglass rotameter is divided into panel type plexiglass rotameter and pipeline type plexiglass rotameter.

Plexiglass rotameter also has the characteristics of high transparency, intuitive reading, not easy to break, lightweight, long life, and convenient installation and connection. However, the tapered glass tube of plexiglass cannot be used for organic solvents (such as trichloroethylene, dichloroethane).

Metal tube rotameter:

Metal tube rotameter is divided into on-site pointer indication type and remote transmission type.

Metal float flowmeter is a kind of flow measuring instrument commonly used in industrial automation process control. It has the characteristics of small pressure loss, large detection range (range ratio 10:1), and convenient use. It can be used to measure the flow of liquid, gas, and steam. It is especially suitable for medium flow measurement with low flow velocity and small flow.

Extended reading: Vortex Steam Flow Meter

The metal float flowmeter has a local display type and an intelligent remote transmission type. With pointer display. Instantaneous flow, cumulative flow, liquid crystal display. Upper and lower limit alarm output. Cumulative pulse output, standard two-wire 4-20mA current output, and other forms. Provide users with a very wide choice of space. In addition, the instrument uses a high-quality MCU micro-processing system. Ensure the excellent performance of the flowmeter in various applications.

Extended reading: Beginner’s Guide: Variable area flow meter

Float (rotor) flowmeter, also known as rotameter, is mainly used for small and medium diameter flow measurement. Can measure liquid, gas, steam, etc.. Product series specifications are complete, in all walks of life are widely used.

If the flowmeter is divided into 5 categories. Then the five commonly used flowmeters are:

  1. Electromagnetic flowmeter
  2. Differential pressure flowmeter
  3. Turbine flowmeter
  4. Ultrasonic flowmeter
  5. Volumetric flowmeter (PD)

If you want to divide the flow meter into three categories. I think it can be divided into volumetric flowmeters, mass flowmeters, and velocity flowmeters.

Sino-Inst is a manufacturer of metal tube flow meters. We offer more than 20 types of metal tube flow meters, 40% for gas, 30% for liquid and the rest for steam.

Metal Tube Flow Meter is mainly used for small and medium diameter flow measurement. It can measure liquid, gas, steam, etc. Complete product series specifications, in all walks of life are widely used.

Metal Tube Flow Meters can be stable flow measurement without modifying the pipeline. This greatly meets the measurement needs of many applications. From small tubes to large tubes can be used.

Sino-Inst’s Metal Tube Flow Meters, made in China, have good quality, with better prices. Our flow measuring instruments are widely used in China, India, Pakistan, USA and other countries.

Sino-Inst’s entire team is well trained, so we can ensure that each customer’s needs are met. If you need any help with your product requirements, whether it is a metal tube flow meters, level sensors, or other equipment, please give us a call.

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