Balanced Gas Turbine Flowmeter

Balanced Gas Turbine Flowmeter

The balanced gas turbine flowmeter is a high-precision flow measurement instrument widely used in industrial fields. It combines the classic mechanical measurement principle with modern intelligent electronic technology, playing a crucial role in industries such as natural gas and petrochemicals.

⚙️ Detection Principle

The working principle of the balanced gas turbine flowmeter is based on the conservation of momentum in fluid mechanics. The core process can be summarized as "flow velocity → rotational speed → electrical signal":

Rotating the impeller: When the measured gas flows along the axis of the pipeline through the flowmeter, the gas flow will impact the turbine (impeller) blades installed at the center of the pipeline, driving the turbine to rotate. Within a certain flow range, the rotational angular speed of the turbine is proportional to the gas flow velocity.

Signal Conversion: The turbine blades are usually made of magnetic conductive materials. When the blades rotate, they will periodically cut the magnetic flux lines of the external magnetic-electric induction coils on the shell, causing a change in the magnetic flux in the coil, thereby inducing an electrical pulse signal proportional to the rotational speed of the turbine.

Data Processing: The frequency (Hz) of the pulse signal is proportional to the instantaneous volumetric flow rate of the gas. This signal is transmitted to the intelligent flow accumulator, which is amplified, shaped, and counted, allowing the calculation of the instantaneous flow rate and cumulative total volume of the gas.

 Temperature and pressure compensation: The intelligent turbine flowmeter also integrates temperature and pressure sensors. The accumulator will automatically convert the volume flow rate under the actual working conditions into the volume flow rate under standard conditions (such as 20℃, 101.325kPa) based on the real-time measured temperature and pressure values, eliminating the impact of environmental changes on the measurement accuracy.

🌍 Application Scope

The balanced gas turbine flowmeter is mainly applicable to clean, dry, and non-corrosive gas media:

Urban gas: Trade settlement of urban gas pipelines, gate station metering, pressure regulating station monitoring

Petroleum and natural gas: Long-distance natural gas pipelines, refueling stations, oil and gas field gathering systems

Industrial production: Gas metering and process control in petrochemicals, steel metallurgy, boilers and kilns

Energy management: Energy efficiency management of compressed air systems, carbon emission monitoring and accounting

Important Note: This flowmeter is not suitable for gases containing a large amount of dust, liquid droplets, or with strong corrosiveness. If the gas contains impurities, a filter should typically be installed upstream of the flowmeter for pre-treatment to protect the turbine bearings.

✨ Product Features

The gas turbine flowmeter combines multiple advantages, but also has some limitations in use.

Main Advantages:

High precision and high repeatability: The accuracy grade is usually ±0.5% or ±0.2%, and the repeatability is better than 0.1%, making it suitable for trade settlement.

Wide flow range ratio: The flow range ratio can reach 10:1 or 20:1, capable of accurately measuring a wide range from small flow to peak flow.

Fast response speed: The response time to flow changes is short (usually less than 50ms), meeting the requirements for rapid feedback in process control.

High intelligence level: It has automatic temperature and pressure compensation functions, can directly display standard-state flow rate. It also supports RS-485 and other communication interfaces, allowing for remote data collection and centralized management.

Low pressure loss: Compared to differential pressure type flowmeters such as orifice plates, its internal flow channel design results in less pressure loss, which is conducive to energy conservation over the long term.

Limitations and Precautions:

High cleanliness requirements for the medium: Bearing wear and blade contamination are the main factors affecting its long-term stability, so the measured gas must be clean.

Mechanical wear exists: Due to the presence of high-speed rotating mechanical components, the bearings will wear out over time, requiring regular verification or calibration to maintain accuracy.

Installation Requirements: To ensure measurement accuracy, a certain length of straight pipe sections before and after the flowmeter are usually required to ensure stable gas flow.

This core feature and advantage:

High-quality aluminum alloy turbine,

Strong flow stability and corrosion resistance Specialized instrument bearings, with low friction, high sealing performance and long service life

The measurement room is isolated from the ventilation room to ensure the safety of the instruments.

Measurable gas temperature, pressure and flow, automatic compensation, display of standard condition cumulative volume measurement, supports real-time query of temperature and pressure

Pulse analog signal output, compatible with RS485/GPRS, enabling centralized data collection and real-time management Wide measurement range (Qmax/Qmin = 20:19), good repeatability, accuracy up to 1.0 grade, low pressure loss, starting flow as low as +0.6 m/h. Intelligent instrument coefficient, supports multi-point non-linear correction.

Built-in temperature and pressure sensor, safe and compact, with an attractive design.

Explosion-proof (ExdHIBT4) and protection (4P65) - dual guarantees

Low-power design, dual power supply with external lithium battery and external power source

Real-time data storage, no loss of instrument coefficients and cumulative flow even in case of power failure, data is permanently saved

It can be compatible with the C-card prepaid system, facilitating trade settlement.

Accuracy Class The instrument is factory-calibrated to AccuracyClass1.5. Forotheraccuracyclasses, please specify your requirements when placing an order.

Amb.Temp. -30℃~+60℃

Atm. Press. 86KРa~106KРa

Med. Temp. -30℃~+100℃

Re1.Hum. 5%~95%