青岛LF10 Series Gas Turbine Flow Meters
● Equipped with a new type of sensor, it features low starting flow, minimal pressure loss, excellent resistance to vibration and pulsating flows, along with superior corrosion resistance, high reliability, and an extended service life.
● Equipped with a new-generation microprocessor and high-performance integrated chips, it delivers exceptional computational accuracy, robust overall functionality, and superior performance.
● Employs advanced, ultra-low-power cutting-edge technology, resulting in exceptionally low overall device consumption. It can operate continuously on internal battery power for extended periods, as well as be powered by an external power source.
● Based on the flow frequency signal, the meter coefficient can be automatically linearly corrected in up to eight segments, allowing users to enhance the meter's calculation accuracy as needed.
● The flow meter display can rotate 180°, making installation and use simple and convenient.
●High accuracy, typically reaching ±1.5%R, ±1.0%R
Category:
Product Description
Product Overview Product overview
The LF10 series gas turbine flowmeter integrates a gas turbine flow sensor and a flow converter into a single unit. Its key performance indicators meet internationally advanced standards, making it the ideal instrument for gas measurement in industries such as petroleum, chemical processing, power generation, and metallurgy, as well as for applications like residential boiler systems, urban natural gas and gas pressure regulation stations, and commercial gas trading.
Performance metrics TECHNICAL PARAMETERS
| Implementation Standards |
Measurement of Gas Flow in Closed Pipelines — Turbine Flow Sensors (GB/T 8940-2003) |
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| Instrument diameter (mm) and connection method |
Flanged Type |
Stainless steel body |
DN25-DN300 |
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| Carbon steel |
DN350, DN400 |
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| Threaded connection type |
Stainless steel body |
DN25, DN40, DN50 |
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| Accuracy Level |
±1.5%R (±1%R requires custom manufacturing) |
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| Measurement range ratio |
1:10:1:20:1:30 |
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| Instrument material |
Body material: 304 stainless steel (DN25–DN300), carbon steel (DN350, DN400) Impeller: Corrosion-resistant ABS or high-quality aluminum alloy Rectifier plate material: ABS for DN25–DN150, and cast aluminum alloy for DN200. Converter: Die-cast aluminum alloy |
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| Terms of Use |
Ambient temperature: -20°C to +60°C |
Relative humidity: 5%–90% |
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| Medium temperature: -30°C to +80°C |
Atmospheric pressure: 86 kPa to 106 kPa |
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| Working power |
A. External power supply: +24VDC ±15%, ripple ≤ ±5%, suitable for 4-20mA output, pulse output, RS485, and more B. Internal Power Supply: 1 set of 3.6V, 10Ah lithium battery, which can operate normally when the battery voltage ranges from 3.0V to 3.6V. Undervoltage indication occurs when the voltage drops below 3.0. |
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| Total system power consumption |
A. External power supply: <2W B. Internal power supply: Average current consumption <800µA. |
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| Flange Standards |
Standard specifications |
GB/T 9113-2000 |
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| Other standards |
International Pipe Flange Standards |
For example: German standard DIN, American standard ANSI, Japanese standard JI |
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| Domestic Pipe Flange Standards |
For example: Standards of the Ministry of Chemical Industry, Standards of the Ministry of Machinery |
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| Thread Standards |
Standard specifications |
British Standard Pipe Threads (External Threads) (Reference Standard GB/T7307-2001) |
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| Other specifications |
Internal threads, NPT threads, and more |
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| Signal output function |
Pulse signal $, 4-20mA current signal *, control signal $ |
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| Communication Output Function |
RS485 communication, optional HART, GPRS |
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| Real-time recording feature |
Start-stop logging, daily logging, and timed interval logging |
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| Signal line interface |
Internal thread M20 × 1.5 or other |
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| Protection Level |
IP65 |
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| Explosion-proof rating |
ExdICT6 Gb |
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| Electrical interface |
M20×1.5 internal thread (NPT threads require customization) |
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How it works Working Principle
Flowmeter Structure
The basic structure of the temperature- and pressure-compensated gas turbine flowmeter is shown in the figure. It primarily consists of the meter body, rotor assembly (including front guide, middle guide, and rear guide), connecting base, and converter, among other components. 。
How it works
When the airflow enters the flowmeter, it first passes through the leading fluid element of the independent mechanism and accelerates. Under the influence of the fluid, the turbine blades—positioned at an angle to the flow direction—generate a rotational torque. Once this torque overcomes the resistance and frictional forces, the turbine begins to spin. At the point where all torques reach equilibrium, the turbine’s rotational speed stabilizes, and its speed becomes linearly proportional to the flow rate. As the rotating signal disk equipped with magnets periodically alters the sensor’s magnetic resistance, a voltage is induced across the sensor terminals—directly corresponding to the volumetric flow rate of the fluid.
The pulse signal from the flow meter. After being amplified and shaped by a preamplifier, this signal—along with the pressure and temperature signals detected by the corresponding sensors—is simultaneously sent to the flow totalizer for processing, enabling direct display of both the standard volumetric flow rate and the cumulative standard volume.
Flow
External dimensions APPEARANCE OF SIZE
Flange Connection Diagram
| Instrument diameter (mm) | L(mm) | H (mm) | G (External Thread) |
| 25 | 170 | 225 | G2 |
| 40 | 200 | 225 | G2 |
| 50 | 220 | 235 | G2 1/2 |
Installation Requirements INSTALLATION
1. Installation Location
- Stay away from vibration sources (such as pumps, valves) and high-temperature areas to prevent turbine blade wear or metering drift.
- Select either the vertical or horizontal section of the pipe (when installing horizontally, ensure the flowmeter is level to prevent liquid buildup from interfering with turbine rotation).
2. Pipeline Conditions
- Ensure the pipeline is clean and free of impurities (such as welding slag or dust) before installation; it’s recommended to install a filter upstream of the flowmeter.
- The pipeline flange must be precisely aligned with the flowmeter flange to prevent misalignment and potential gas leaks.
3. Flow and Connectivity
- Install strictly according to the arrow markings on the flow meter housing, ensuring alignment with the actual gas flow direction. Reverse installation will result in inaccurate measurement.
- Use rigid connections (such as flange connections) to prevent vibration transmission caused by flexible hose connections.
4. Straight Pipe Sections Before and After
- A straight pipe section of at least 10 times the pipe diameter (10D) must be maintained upstream of the flowmeter, and a section of at least 5 times the pipe diameter (5D) should be kept downstream to minimize the impact of pipe turbulence on measurement accuracy (where D represents the pipe inner diameter).
Tianjin Ling Yu Technology Co., Ltd.
Operator:86-22-58554679
Fax: 022-58285528
Manager Ding: 86-18902041592
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Factory Address: No.5 Yingbin Road, Xiqing District, Tianjin
E-mail:sales@lingyukeji.com
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