定西LF11 Series Liquid Turbine Flow Meters
● High accuracy, typically reaching ±1%R, ±0.5%R, with high-precision models capable of up to ±0.2%R
● Outputs a pulse frequency signal, suitable for total quantity measurement and computer connectivity with no zero-point drift, and boasts strong anti-interference capability.
● Can obtain high-frequency signals (3–4 kHz) with strong signal resolution.
● Wide rangeability—up to 1:20 for medium and large diameters, and 1:10 for small diameters.
● Can be made in an insertion type, suitable for large-diameter measurements with minimal pressure loss and low cost. It allows non-stop flow extraction and offers convenient installation and maintenance.
Category:
Product Description
Product Overview Product overview
The LF11 series liquid turbine flowmeters represent a new generation of turbine flow instruments, featuring optimized design and incorporating advanced technologies from both domestic and international sources. They boast characteristics such as simple and lightweight construction, high accuracy, excellent repeatability, rapid response, and ease of installation, maintenance, and operation. As a precision flow measurement device, these meters are ideally suited for quantifying the flow rate and total volume of clean, non-corrosive liquids—free of impurities. They are widely used in industries including petroleum, chemical processing, metallurgy, and scientific research.
Performance metrics TECHNICAL PARAMETERS
| Tested medium |
Impurity-free, low-viscosity, non-corrosive liquid |
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| Implementation Standards |
Turbine Flow Sensor (JB/T9246-1999) |
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| Verification Procedure |
Turbine Flowmeter (JJG1037-2008) |
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| Instrument diameter (mm) and connection method |
Flange-connected type |
DN15-DN200 |
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| Threaded connection type |
DN4-DN50 |
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| Clip-mounted connection type |
DN4-DN200 |
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| Accuracy Level |
±1%R, ±0.5%R, ±0.2%R (custom-made required) |
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| Measurement range ratio |
1:10; 1:15; 1:20 |
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| Sensor material |
304 stainless steel, 316(L) stainless steel, and more |
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| Terms of Use |
Medium temperature: -20°C to +80°C |
Ambient temperature: -20°C to +60°C |
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| Relative humidity: 5%–90% |
Atmospheric pressure: 86 kPa to 106 kPa |
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| Signal output function |
Pulse signals, 4–20mA signals |
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| Communication Output Function |
RS485 communication, HART protocol, and more |
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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 lithium battery, which operates normally when the battery voltage is between 3.0V and 3.6V. |
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| Flange Standards |
Standard Specifications |
GB/T 9113-2000 |
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| Other standards |
International Pipe Flanges |
For example: German standard DIN, American standard ANSI, Japanese standard JIS |
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| Domestic Pipe Flanges |
For example: Standards of the Ministry of Chemical Industry, Standards of the Ministry of Machinery |
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| Thread Specifications |
Standard Specifications: Imperial Pipe Threads (External Threads) (Reference Standard GB/T7307-2001) |
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| Other specifications: internal threads, spherical threads, NPT threads, and more |
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| Electrical interface |
M20×1.5 internal thread (NPT threads require customization) |
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| Explosion-proof rating |
ExdIICT6 Gb |
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| Protection Level |
IP65 or higher (customizable) |
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How it works Working Principle
When the liquid being measured flows through the sensor, the impeller rotates under the force exerted by the fluid—its rotational speed is directly proportional to the average flow velocity in the pipe. As the impeller spins, it periodically alters the magnetic reluctance of the magnetic circuit, causing the magnetic flux in the detection coil to fluctuate cyclically as well. This induces an electromotive force with a frequency identical to that of the impeller’s rotation. After amplification, the signal is converted and processed for further analysis.
External dimensions APPEARANCE OF SIZE
| Threaded Connection Size Chart | Flange Connection Dimension Chart | |||||||||||||||||
| Instrument diameter (mm) |
L*(mm) | H (mm) | G (External Thread) | Instrument diameter (mm) |
L*(mm) | D (mm) |
K (mm) |
H(mm) | d (mm) |
n (Number of holes) |
Standard configuration Pressure-resistant |
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| Pulsed type | Explosion-proof Pulse Type | 4-20mA Output Type | Intelligent Display Type | Pulse Output Type | Explosion-proof pulse Output type |
4-20mA Output type |
Intelligent Display Type | |||||||||||
| 4 | 225 | 140 | 145 | 145 | 210 | G 1/2 | 15 | 75 | 95 | 65 | 175 | 180 | 180 | 245 | 14 | 4 | 2.5MPa | |
| 6 | 225 | 140 | 145 | 145 | 210 | G 1/2 | 20 | 80 | 105 | 75 | 185 | 190 | 190 | 255 | 14 | 4 | ||
| 10 | 345 | 145 | 150 | 145 | 210 | G 1/2 | 25 | 100 | 115 | 85 | 200 | 195 | 195 | 260 | 14 | 4 | ||
| 15 | 75 | 145 | 150 | 150 | 215 | G1 | 32 | 140 | 140 | 100 | 210 | 215 | 215 | 275 | 18 | 4 | ||
| 20 | 80 | 150 | 155 | 155 | 220 | G1 | 40 | 140 | 150 | 110 | 195 | 220 | 220 | 285 | 18 | 4 | ||
| 25 | 100 | 155 | 160 | 160 | 225 | G 1/4 | 50 | 150 | 165 | 125 | 230 | 235 | 235 | 295 | 18 | 4 | ||
| 32 | 140 | 175 | 180 | 180 | 245 | G2 | 65 | 170 | 185 | 145 | 255 | 260 | 260 | 325 | 18 | 8 | 1.6MPa | |
| 40 | 140 | 180 | 185 | 180 | 250 | G2 | 80 | 200 | 200 | 160 | 260 | 265 | 265 | 330 | 18 | 8 | ||
| 50 | 150 | 185 | 190 | 190 | 255 | G2 1/2 | 100 | 220 | 220 | 180 | 285 | 285 | 285 | 350 | 18 | 8 | ||
| 125 | 250 | 250 | 210 | 310 | 315 | 315 | 380 | 18 | 8 | |||||||||
| 150 | 300 | 285 | 240 | 345 | 345 | 345 | 410 | 22 | 8 | |||||||||
| 200 | 350 | 340 | 295 | 395 | 400 | 400 | 465 | 22 | 12 | |||||||||
Note: The DN4–DN10 flow sensors mentioned above include the standard straight pipe sections provided at the factory, while DN15–DN50 caliber flow sensors do not come with straight pipe sections.
Installation Requirements INSTALLATION
1. Positioning installation
The pipeline must be completely filled with liquid. It is crucial to ensure that the pipe remains fully saturated with liquid at all times—otherwise, the flow reading may be affected, potentially leading to measurement errors.
Avoid air bubbles. If air bubbles enter the measuring tube, the flow reading may be affected, potentially leading to measurement errors.
2. Installation Location and Requirements
1. The sensor should be installed in a location that is convenient for maintenance, free from pipe vibrations, strong electromagnetic interference, and thermal radiation effects.
2. For horizontally mounted sensors, the pipeline should not have any visually detectable inclination (typically within 5°). Similarly, when sensors are installed vertically, the verticality deviation of the pipeline must also remain below 5°. In locations where flow interruption is not possible, a bypass pipe and reliable shut-off valves should be installed. During measurement, ensure that the bypass pipe remains completely leak-free.
3. At the location where sensors will be installed on the newly laid pipeline, first connect a short pipe instead of the sensor. Once the "line sweeping" operation is complete and you’ve confirmed that the pipeline is thoroughly cleaned, proceed to install the sensors properly.
4. If the fluid contains impurities, a filter should be installed upstream of the sensor, and the pipeline should be regularly cleaned to remove any accumulated sediment. If the liquid being measured contains gas, an air eliminator must be installed upstream of the sensor. Additionally, the drain and vent ports of both the filter and air eliminator must lead to a safe location.
5. When sensors are installed outdoors, measures should be taken to prevent direct sunlight and protect them from rain.
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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