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LF13-..B Series Temperature and Pressure Integrated Vortex Flowmeter
● The sensor outputs a pulse frequency that is linearly proportional to the actual flow rate of the fluid being measured, with zero-point stability and highly reliable performance. It also comes in a variety of structural designs, including pipeline-type and insertion-type flow sensors.
●High accuracy—typically, the measurement accuracy for liquids is ±1.0%, while for gases it’s ±1.5%.
● Flexible installation options allow for horizontal, vertical, and angled mounting depending on the site-specific process piping.
● Uses EEPROM to provide power-off protection for cumulative flow, with a protection duration exceeding 10 years.
● The software corrects for the nonlinearity of the meter coefficient, enhancing measurement accuracy;
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Product Description
Product Overview Product overview
The LF13-..B series integrated temperature and pressure vortex flowmeter is a type of velocity-based flowmeter, widely used in industries such as petroleum, chemical processing, power generation, light industry, and district heating. Our company’s vortex flowmeters are manufactured according to the standards specified in Vortex Flow Sensor (JB/T9249-2015) and the Verification Procedure for Vortex Flowmeters (JJG1029-2007). This instrument is widely applicable for flow measurement in large, medium, and small-scale pipelines used for water supply and drainage, industrial circulation systems, wastewater treatment, as well as for oils, chemical reagents, compressed air, saturated and superheated steam, natural gas, and various other media.
Performance metrics TECHNICAL PARAMETERS
| Tested medium |
Medium- to high-flow-rate media such as steam, compressed air, coal gas, and liquids |
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| Implementation Standards |
Vortex Shedding Flow Sensor (JB/T9249-2015) |
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| Verification Procedure |
Vortex Flow Meter (JG1029-2007) |
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| Instrument diameter (mm) and connection method
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Flange-connected type |
DN15-DN300 |
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| Clip-on Connection Type |
DN15-DN300 |
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| Accuracy Level |
Liquid: ±1%; Gas or vapor: ±1.5%, ±1% |
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| Measurement range ratio |
1:10; 1:15; 1:20 |
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| Sensor material |
304 stainless steel, 316 stainless steel, and more |
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| Terms of Use |
Media temperatures: -40°C to +70°C, -40°C to +250°C, -40°C to +350°C Ambient temperature: -20°C to +60°C 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 3.0V, 10Ah lithium batteries, which can operate normally when the battery voltage ranges between 2.0V and 3.0V. |
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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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| 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
The vortex shedding flowmeter consists of a vortex generator, a detection probe, and the corresponding electronic circuitry. When a fluid flows past the vortex generator, it creates two alternating rows of vortices on either side—these vortices are known as Karman vortices. Building on Karman's vortex street theory, Strouhal further proposed that the frequency of the Karman vortex street is directly proportional to the fluid's flow velocity, and he provided the following equation relating frequency to flow speed:
f = St × V/d where:
f: Vortex shedding frequency (Hz)
V: Average flow velocity (m/s) on both sides of the vortex generator
St: Strouhal number (constant within a certain range of Reynolds numbers)
d: Width of the vortex generator's upstream face (m)
These alternating vortices generate a series of fluctuating fluid lift forces, which act on the piezoelectric-based sensing probe, producing a corresponding series of alternating electrical charge signals. After being processed by a pre-amplifier—where they undergo conversion, shaping, and amplification—the signals are output as pulse trains that match the vortex shedding frequency and are directly proportional to the flow velocity.
External dimensions APPEARANCE OF SIZE
| Flange Connection Type Dimension Chart | |||||||||
| Instrument diameter (mm) |
L (mm) |
D (mm) |
K (mm) |
H(mm) | d (mm) |
n (Number of holes) |
Bolt specifications | Standard configuration Pressure-resistant |
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| Pulse Output Type | Smart-type | ||||||||
| 15 | 180 | 95 | 65 | 415 | 440 | 14 | 4 | M12 × 60 | Φ18 × 1.5 |
| 20 | 180 | 105 | 75 | 420 | 445 | 14 | 4 | M12 × 60 | Φ25 × 2.5 |
| 25 | 180 | 115 | 85 | 425 | 450 | 14 | 4 | M12 × 60 | Φ32 × 3.5 |
| 32 | 180 | 140 | 100 | 435 | 460 | 18 | 4 | M16×70 | Φ39 × 3.5 |
| 40 | 180 | 150 | 110 | 435 | 455 | 18 | 4 | M16×70 | Φ48×4 |
| 50 | 180 | 165 | 125 | 460 | 480 | 18 | 4 | M16×70 | Φ59 × 4.5 |
| 65 | 200 | 185 | 145 | 470 | 500 | 18 | 4 | M16×70 | Φ74 × 4.5 |
| 80 | 200 | 200 | 160 | 490 | 520 | 18 | 8 | M16×70 | Φ89 × 4.5 |
| 100 | 200 | 220 | 180 | 515 | 545 | 18 | 8 | M16×70 | Φ109 × 4.5 |
| 125 | 220 | 250 | 210 | 535 | 560 | 18 | 8 | M16×70 | Φ134 × 4.5 |
| 150 | 220 | 285 | 240 | 570 | 595 | 22 | 8 | M16 × 90 | Φ159 × 4.5 |
| 200 | 220 | 340 | 295 | 625 | 650 | 22 | 12 | M16 × 90 | Φ219 × 9 |
| 250 | 250 | 405 | 355 | 685 | 710 | 26 | 12 | M24×110 | Φ273 × 11 |
| 300 | 300 | 460 | 410 | 710 | 735 | 26 | 12 | M24×110 | Φ325 × 12 |
Note: ① All the above parameters apply to vortex flowmeters with a pressure rating of 1.6 MPa and flanged connections.
② The flanged vortex flowmeter is delivered without pipe flanges and bolts, which must be purchased separately by the user. The connecting flange complies with the GB/T 9113-2000 standard for raised-face, flat-welded steel pipe flanges.
Installation Requirements INSTALLATION
1. Cut an opening in the pipe according to the required opening dimensions, ensuring that the opening aligns with the straight pipe section requirements.
2. Place the complete flowmeter assembly—already connected to the flange—into the pipe with the prepared opening.
3. Spot-weld the flange to the pipe for positioning.
4. Remove the flowmeter, weld the flanges according to specifications, and carefully clean all protruding parts inside the pipeline. Install a sealing gasket of the same diameter as the pipe into the inner groove of the flange, then insert the flowmeter into the flange assembly—with the flow direction indicator aligned in the same direction as the fluid flow—and finally secure it tightly with bolts.
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Tianjin Ling Yu Technology Co., Ltd.
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