西安LF12 Series Swirl Vortex Flowmeter
● No mechanical rotating parts, resistant to corrosion, highly reliable, and requires no maintenance during prolonged operation
● Only a shorter straight pipe section is needed, or none at all
● Leveraging advanced microprocessor technology, the instrument achieves higher integration and reliability, with more precise calculations.
● The device boasts extremely low power consumption, allowing it to operate continuously on its internal battery—making it the ideal on-site display instrument that requires no external power source.
● Signal outputs can be pulse signals, 4–20mA current signals, and RS485 data communication, offering users flexible choices.
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Product Description
Product Overview Product overview
The LF12 series vortex flowmeter incorporates the latest microprocessing technology, offering robust functionality, an exceptionally wide flow range, simple operation and maintenance, and convenient installation and use—features that ensure its key technical specifications meet the advanced standards of similar international products. It is widely used for measuring various gases in industries such as petroleum, chemical processing, power generation, metallurgy, and coal mining.
Performance metrics TECHNICAL PARAMETERS
| Nominal Diameter |
DN15 to DN300 |
| Accuracy |
Level 1.5, with Level 1.0 available as an option |
| Display |
Large LCD screen display shows both instantaneous and cumulative flow rates simultaneously. |
| Power supply |
a: +24VDC ±10%, ripple ≤ ±5% B: 3.6V lithium battery |
| Output signal |
Operating condition pulse, 4–20mA current signal, RS-485 data communication |
| Shell Material |
Aluminum alloy or stainless steel |
| Explosion-proof marking |
ExdIIBT4 |
| Cable interface |
Explosion-proof 1/2 NPT internal thread, with other M20 × 1.5 internal threads. |
| Terms of Use |
Ambient temperature: -30°C to +65°C Relative humidity: 5% to 95% Media temperature: -20°C to +80°C Atmospheric pressure: 86 kPa to 106 kPa |
| Shell Material |
Cast aluminum |
| Protection Level |
IP65 |
How it works Working Principle
When fluid enters the flowmeter inlet along the axial direction, the rotating vanes force the fluid into rotational motion, creating a vortex at the center of the vortex generator. This swirling flow then spirals inward through the Venturi tube, accelerating as it passes through the constricted section due to the sudden throttling effect. As the vortex flow abruptly moves into the diffuser section, reverse flow causes it to undergo a secondary, spiral-like rotation. If the instrument features an optimally designed internal geometry, the frequency of the vortex will remain directly proportional to the flow rate—and linear—across a wide measurement range. This frequency is detected by a piezoelectric sensor, which converts the weak electrical signal into a more robust pulse signal. The pulse signal is then amplified, filtered, and shaped by a front-end amplifier before being sent to the flow totalizer for further computation and processing.
External dimensions APPEARANCE OF SIZE
| Installation Dimension Chart for Vortex Flow Meters | ||||||
| Model Specifications | Nominal Diameter DN |
B | 4.0MPa | |||
| H | D | K | n-L | |||
| LUX-20 | 20 | 160 | 310 | 105 | 75 | 4-Φ14 |
| LUX-25 | 25 | 180 | 315 | 115 | 85 | 4-Φ14 |
| LUX-32 | 32 | 200 | 330 | 140 | 100 | 4-Φ18 |
| LUX-50 | 50 | 232 | 345 | 165 | 125 | 4-Φ18 |
| LUX-80 | 80 | 330 | 370 | 200 | 160 | 8-Φ18 |
| LUX-100 | 100 | 410 | 400 | 235 | 190 | 8-Φ22 |
| LUX-150 | 150 | 580 | 465 | 300 | 250 | 8-Φ26 |
| LUX-200 | 200 | 700 | 535 | 375 | 320 | 12-Φ30 |
| Note | The flowmeter installation uses the pipe flange standard GB/T 9119-2000, which specifies raised-face, flat-welded steel pipe flanges. (Also compliant with JB/82.1-94 Convex Welding Steel Pipe Flanges) |
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Installation Requirements INSTALLATION
1. Flow meters must not be welded directly onto pipeline flanges while the system is in operation.
2. Before installing the flowmeter, thoroughly clean out any debris, weld spatter, and dust from the pipeline.
3. To facilitate maintenance without disrupting the normal fluid flow, it is recommended to install a bypass pipe as shown in Figure 5.
4. The straight pipe section upstream of the flow meter should be ≥3DN, and the straight pipe section downstream should be ≥1DN.
5. When the gas contains larger particles or longer fibrous impurities, a filter must be installed.
6. The flow meter can be installed vertically or at any angle of inclination.
7. When installing the flowmeter horizontally, it is recommended to install a steel expansion joint (compensator) downstream of the straight pipe section following the flowmeter. The expansion joint must meet the nominal diameter and nominal pressure requirements specified in the pipeline design. (The expansion joint serves to compensate for pipeline stresses and facilitates the easy installation and removal of the flowmeter.)
8. The pressure tapping section is fitted with an M12×1 ferrule, and an 8 mm copper tube is connected to the inlet of the pressure transmitter. If pressure tapping is not required, the flowmeter will already be sealed with a plug at the factory. Note: Pressure taps must not be installed upstream of this series of flowmeters!
9. When installing a flowmeter for outdoor use, it is recommended to equip it with a protective cover to prevent rainwater from entering and direct sunlight from damaging the meter, thereby extending its service life.
10. Strong external magnetic fields and intense mechanical vibrations must be avoided near the flowmeter.
11. The flowmeter must have reliable grounding, but it must not share the same ground wire as the high-voltage electrical system.
Tianjin Ling Yu Technology Co., Ltd.
Operator:86-22-58554679
Fax: 022-58285528
Manager Ding: 86-18902041592
WhatsApp：8618902041592
Complaint Hotline:86-15822286986
Factory Address: No.5 Yingbin Road, Xiqing District, Tianjin
E-mail:sales@lingyukeji.com
Purchasing Department E-mail:lykj_tj@163.com
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