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LR-S1 Series Tuning Fork Level Switch
●LNG Liquefied Natural Gas Transportation Pipeline (density 0.56 g/cm³)
● Raw material storage tanks, tanks, and reaction vessels (for highly corrosive, high-temperature liquids) used in chemical fragrance production
● Oil, crude oil, gasoline, and lubricant storage tanks
● Can be configured via HART handheld device
● Pipeline Level Control in the Pump Protection System
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Product Description
Product Overview Product overview
This series of tuning fork level switches is a highly reliable control switch specifically designed for liquid level measurement. With a tuning fork length of just 40 mm, it’s ideal not only for measuring liquid levels in containers, storage tanks, and vats but also in confined spaces like pipelines. Leveraging the principle that changes in vibration frequency occur when the sensing fork is immersed in the medium, the fork undergoes precise tuning, enabling the product to detect media with densities as low as 0.5 g/cm³. This makes it suitable for applications involving acids such as hydrochloric, sulfuric, and nitric acid, as well as alkaline solutions, syrups, pharmaceutical liquids, and industrial wastewater. Additionally, it excels in challenging environments—such as high-pressure liquefied gases (e.g., LNG)—and conditions characterized by foam, bubbles, viscous liquids, or even significant vibrational interference.
Product Principle THE PRODUCT PRINCIPLE
This series of tuning fork level switches uses a piezoelectric element to achieve vibration driving and detection of the fork. When the fork comes into contact with the liquid being measured, its resonant frequency significantly decreases. The resulting change in vibration frequency is directly reflected in the output signal from the piezoelectric sensing device. The detection circuit then analyzes this frequency shift and generates a switching signal accordingly.
Performance metrics TECHNICAL PARAMETERS
| Applicable Liquids | Density | ≥0.5 g/cm³ |
| Viscosity | 0.1–10,000 mPa·s① | |
| Flow rate | Up to 6 m/s | |
| Probe parameters | Surface finish | Ra ≤ 0.5 μm② |
| Vibration frequency | Close to 1200 Hz | |
| Fork body length | 40mm | |
| Accuracy | Measurement deviation | ±1 mm |
| Lagging effect | 2mm | |
| Repetitiveness | 0.1mm | |
| Switch Delay | Contacting materials | 0.5s |
| No materials | 1s | |
| Power supply | Relay Output Type | 20–253 V AC / 20–72 V DC |
| Two-wire type | 10–36V DC | |
| NAMUR | 8.2V DC | |
| Transistor (NPN/PNP) | 6–48V DC | |
| Maximum power consumption | 8VA (AC); 1.5W (DC) | |
| Signal output | Relay | Double-throw double-pole 5A / 253V AC / 24V DC |
| Two-wire system | 8mA/16mA, alarm <2.3mA | |
| NAMUR | ≤1mA or ≥2.1mA, Fault ≤ 1mA |
|
| Transistor | NPN/PNP | |
| Work environment | Process pressure | -1 to 64 bar |
| Process temperature | Ambient Temperature: -50 to 150°C | |
| High temperature –50 to 250°C | ||
| Ambient temperature | -40 to 70°C | |
| Storage and Transportation Temperature | -40 to 80°C | |
| Overvoltage protection | Relay Output Type | Category III, Level I |
| Two-wire type | Category III, Level II | |
| Security Certification | SIL Certification | SIL2 (HFT=0) / SIL3 (HFT=1) |
| Explosion-proof rating | Flameproof: Ex d IIC T6–T1 Gb | |
| Intrinsically Safe: Ex ia IIC T6–T1 Ga | ||
| CE | LVD Certificate and EMC Certificate | |
| Protection Level | IP66/IP67 | |
| Material | Shell | Aluminum alloy |
| Ground terminal | 316L | |
| Threaded Process Connection | 316L | |
| Flange Process Connection | 316L, 316L-coated Enamel, 316L-coated ECTFE, 316L-coated PFA | |
| Fork body | 316L, 316L-coated Enamel, 316L-coated ECTFE, 316L-coated PFA | |
| Process Sealing | Klinger C-4400 Gasket |
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Tianjin Ling Yu Technology Co., Ltd.
Operator:86-22-58554679
Fax: 022-58285528
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Factory Address: No.5 Yingbin Road, Xiqing District, Tianjin
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