How to choose the right flow meter?

Gas Turbine Flow Meter

 

WSDWG series gas turbine flow meter is one kind of precision measuring instruments which for gas measuring. This flow meter has the characteristics of low pressure loss, high accuracy, low initiating flow, anti vibration and pulsation flow resistance, widely range ratio etc.

 

When design WSDWG series gas turbine flow meter, we consider the gas compressibility, Volume quantity is closely related with medium temperature and pressure, thus we add the temperature and pressure sensors so that monitor the change of medium temperature and pressure, directly make working condition flow change into standard condition flow and ensure measuring accuracy.

 

WSDWG series gas turbine flow meter could be separately used for gas that is clean, low viscosity, such as Air, Natural gas, LPG, Methane gas, N2, Ar, Co₂, CO etc.

 

WSDWG could be widely used in gas measuring from Petroleum, Chemical, Electric power, Industrial boiler etc. In addition, WSDWG series gas turbine flow meter also be used in Gas-fired, Gas pipeline network, city gas field etc.

 

Working Principle of gas turbine flow meter:

 

WSDWG gas turbine flow meter is made up of base table and display, among them, the base table contains body, Rectifier, Turbo, Temperature sensor, Magnetic switch sensor, Pressure sensor and other important parts.

 

When medium enter the flow meter, through integration of the two level rectifier, medium be rectified and accelerated, then acts on the turbine blades which make a certain angle with flow direction, same time turbine will produces rotational torque, turbine blades begins to rotate after turbine overcomes the resistance moment and friction moment. When all moments reach balance, invariables turning speed, turbine rotation angular velocity is liner relationship with flow. Utilizing electromagnetic induction principle, through the top magnetizer of rotating turbine generator periodically change magnetic resistance and make magnetic field change accordingly, thus induction of the pulse signal that it is proportional to the volume flow rate.

 

This signal is amplified by preamplifier and shaped, the signal will be entered into integrating instrument together the temperature and pressure signal, then the integrating instrument will calculate and convert to flow value, the directly display standard instantaneous volume flow and total flow.

 

Features of gas turbine flow meter:

 

* Rectifying device could be installed at the installation conditions not good and medium velocity change larger, also could keep there liability of measurement.

 

* Adopt RS485 communication, could be matched with MODEM, through telephone network could build automatic reading management system, higher automation.

 

* Dust-proof structure can effectively prevent the impurity of the medium enter into bearing and cause rapid wear and stuck.

 

* Adopt E2-PROM data storage technology,setup parameters could be keep long time after outage.

 

* Low installation requirements,front straight pipe≥2D, back straig ht pipe≥1D,this could ensure the accuracy of flow meter.

 

* The low voltage alarm(≤2.7V)of internal battery could remind user to replace battery.

 

* Intelligent integration design could dynamically detect the temperature and pressure of medium, and automatic compensation and compression factor correction,directly display gas standard instantaneous flow and standard total flow.

 

* The intelligent integrating instrument could rotate 180 degrees, it is convenient reading, Unexpected power outage, Autosave data, Prevent data lost.

 

* Aluminum alloy turbine have some features: High strength, Corrosion resistance, Anti-aging, Long service life, High accuracy and good repeatability.

 

* Flow meter with signal output calibration function and could 4,8,16,20mA and 0~1000Hz.

 

* Advanced microcomputer technology and high performance singe chip make complete meter more powerful and superior performance.

 

* Adopt over wide temperature LCD technology,and LCD display converter can bear max. 80℃.

 

* Advanced double power supply and micro power consumption technology, complete meter with low power consumption. Both could run on battery for a long time (Two lithium batteries could be used 3 years) and also could connect outside power.

 

* Outside power is isolated with main circuit of flow meter, Isolation voltage reach 1000V.

 

* Large screen backlight LCD display,could clearly reading under dark environment.

 

* Reliable electromagnetic compatibility design.

 

* Flow meter with pulse output, also could add 4-20mA output, IC card quantitative pulse signal etc. According to user's requirement.

 

* One aviation plug, all output terminal.

 

Liquid Turbine Flow Meter

 

Liquid flows through the turbine housing causing an internal rotor to spin. As the rotor spins, an electrical signal is generated in the pickup coil. This signal is converted into engineering units ( liters, cubic meters, gallons etc. ) on the local display where is applicable. Optional accessory modules can be used to export the signal to other equipment.

 

Upon receipt, examine your meter for visible damage. The turbine is a precision measuring instrument and should be handled carefully.

 

Remove the protective plugs and caps for a thorough inspection. If any items are damaged or missing, contact.

 

Make sure the turbine flow model meets your specific needs. For your future reference, it might be useful to record this information on nameplate in the manual in case it becomes unreadable on the turbine. Refer to the nameplate for your customized product's specification.

 

Warning

 

For your safety, review the major warnings and cautions below before operating your equipment.

 

* Use only fluids that are compatible with the housing material and wetted components of your turbine.

 

* When measuring flammable liquids, observe precautions against fire or explosion.

 

* When handling hazardous liquids, always follow the liquid manufacturer's safety precautions.

 

* When working in hazardous environments, always exercise appropriate safety precautions.

 

* During turbine removal, liquid may spill. Follow the liquid manufacturer's safety precautions for clean up of minor spills.

 

* Do not blow compressed air through the turbine.

 

* Handle the rotor carefully. Even small scratches or nicks can affect accuracy.

 

* When tightening the turbine, use a wrench only on the wrench flats.

 

* For best results,calibrate the meter at least 1 time per year.

 

Oval Gear Flow Meter

 

Oval gear flow meter is one of positive displacement flow meter and mainly composed of meter shell, oval gear rotor and converter. It is an instrument used for continuous or discontinuous metering and control of liquids in the pipeline. It has advantages of large metering range, excellent accuracy, small pressure loss and high viscosity adaptability etc; It has good performance on measuring high-temperature and high-viscosity liquids. It is applicable to the calibration and metering of crude oil, chemical,chemical fiber, traffic, commerce, food, medicine and health, scientific research and military etc.

 

Working Principle and Structure:

 

Flow meter is installed in the metering tank and the measurement of a pair of oval box gear, with the upper and lower cover, an early Lunar sealed cavity (due to rotation of the gear, so sealing is not an absolute) as a unit of emissions. When measured by the pipe into the liquid flow meter, due to pressure generated by the Import and Export Department to promote a pair of differential gears for rotation, the constant measurement by cavity after the beginning of the Lunar liquid delivery to the exit, elliptical gear with each revolution time displacement is the product of four times the measured volume of liquid flow.

  

Flow meter is made by the shell, counter, oval gear and coupling (magnetic coupling and sub-axial coupling) and so on.

 

Coriolis Mass Flow Meter

 

Working principle:

 

Based on the principle of Coriolis force, the fluid deflects when flowing in the vibrating tube, and the mass flow rate is calculated by measuring the deflection.

 

Advantages and features:

 

Can output mass flow, density, temperature, etc. at the same time

 

High accuracy, suitable for a variety of complex media

 

Can measure non-Newtonian fluids and multiphase flows

 

Applicable working conditions:

 

✔ High-end applications: chemical, pharmaceutical, natural gas, liquefied gas

 

✔ Especially suitable for high-quality measurement occasions

 

✘ Expensive, suitable for projects with sufficient budget

 

Thermal Mass Flow Meter

 

A Thermal Mass Flow Meter is a highly accurate and reliable device used to measure the mass flow rate of gases. Unlike volumetric flow meters, thermal flow meters provide direct mass flow readings without needing temperature or pressure compensation, making them ideal for a wide range of industrial gas measurement applications.

 

Working Principle

 

Thermal mass flow meters operate based on the principle of heat transfer. Typically, two temperature sensors and a heating element are placed within the gas stream. As the gas flows past the heated sensor, it absorbs heat and carries it away. The rate of heat loss is directly proportional to the mass flow rate of the gas.

 

Key Advantages

 

Direct Mass Flow Measurement

No need for additional sensors or compensation — get accurate mass flow data instantly.

 

Highly Accurate for Gases

Especially effective for low and medium velocity gas flow applications.

 

No Moving Parts

Reduces wear and tear, lowers maintenance needs, and ensures long service life.

 

Wide Turn down Ratio

Typically offers a range of 100:1 or more, allowing accurate readings from very low to high flow rates.

 

Minimal Pressure Drop

The non-intrusive sensor design ensures the pressure loss in the pipeline is negligible.

 

Easy Installation and Integration

Available in inline or insertion types, suitable for various pipe diameters and systems.

 

Common Application Scenarios

 

Thermal mass flow meters are best suited for clean, dry, single-phase gases. They are widely used in:

 

Compressed Air Systems

Accurate monitoring of air consumption and leakage detection.

 

Natural Gas Measurement

Fuel gas flow measurement in industrial furnaces, boilers, and heating systems.

 

Biogas and Flue Gas Monitoring

Used in waste-to-energy plants and emission monitoring systems.

 

Gas Distribution Networks

Efficient flow management in process and utility gas pipelines.

 

Semiconductor and Electronics Industries

Precise control of specialty gases in manufacturing processes.

 

HVAC and Building Management Systems

For measuring airflow in ventilation and duct systems.

 

Metal Tube Rotameter

 

WSDLZZ Series intelligent metal tube rotameter is a variable area flow meter which is based on the float position measurement. With full-metal structure, it has the features of small size, low pressure loss, large range ratio(10~20:1), optional transmitter with HART communication function, and convenient installation & maintenance etc. It is widely used in flow measurement and process control of small flow, low flow rate, and various industries under complex and harsh environments.

 

Working Principle

 

The flow meter consists of a measuring tube and a float inside it. The flow pushes the float to an equilibrium point. The area obtained between the float and the tube is proportional to the flow rate.

 

The point of equilibrium depends on:

 

E=Force of the fluid flow

 

Ff=Weight of the float

 

Al=Free area of flow

 

Where:

 

Al=Ao (calibrated orifice area)- Af (float area)

 

Features

 

* Robust all-metal structure design.

 

* Suitable for gas and liquid measurement in various industries.

 

* Cone-shape measuring tube design, which has wide measuring range and good linearity.

 

* Wetted parts material are optional: SS304 SS316L, FEP, Hastelloy C, Titanium.

 

* Adopt advanced magnetic coupling system design, improve the accuracy and stability.

 

* The upper row displays the instantaneous flow, the lower row displays the total flow.

 

* For the digital LCD display type, the flow range of the instantaneous flow can be corrected onsite based on the different measuring medium.

 

* It adopts advanced six level data back up technology, data of total flow can be saved 

automatically when power-off, (the total flow sending period is 0.3S).

 

* Besides AC/DC power supply, it supports battery power supply function.

 

* No need to open the cover, it can be operated by a magnetic pen; the key operation function is also available.

 

* Through the HART protocol, you can use the handheld operator or host computer software to perform partial or full configuration operations on the flow meter.

 

* Choosing the right flow meter means choosing efficiency and safety

 

Each flow meter has its own unique advantages and applicable working conditions. When selecting a flow meter, please consider factors such as medium properties, measurement accuracy, budget, and maintenance convenience. If you still have questions about the selection, please contact us for one-on-one professional selection advice and quotation solutions. We will provide you with the best flow meter solution that matches the working conditions!