Ring-11 Sanitary Liquid Level Switch
The Ring-11 Sanitary Liquid Level Switch is a vibration level switch featuring a polished probe and tuning fork, designed for liquid hygienic applications and universal use in all liquids.
The Ring-11 Sanitary Liquid Level Switch is a vibration level switch featuring a polished probe and tuning fork, designed for liquid hygienic applications and universal use in all liquids. It is particularly suited for use in storage tanks, mixing vessels, and pipes, where both internal and external hygiene requirements are especially stringent.
Piezoelectric devices are used to drive vibration and detect changes. When the resonant vibration fork contacts the application medium, its vibration frequency decreases significantly. This reduction in frequency is reflected in the output signal from the piezoelectric detection device. An integrated circuit then analyzes this signal and generates a switch signal in response.
● Surface finish with Ra<0.5μm, ensuring a smooth, hygienic surface for sanitary applications.
● Polished tuning fork with a wide range of hygienic process fittings for versatile installation.
● Optional gas-tight lead-through for high-pressure applications, ensuring safety and reliability in extreme conditions.
● Compact fork body of only 40mm, ideal for liquid level measurement in narrow spaces.
● After precise tuning, the two forks are completely symmetrical, providing consistent vibration and higher sensitivity.
● The measurable medium density is as low as 0.5g/cm³, making it suitable for liquid level measurement of most liquids.
● The process temperature can reach up to 250°C (482°F) for high-temperature applications.
● Features Intrinsically-safe and Flame-proof Certifications (Flame-Proof: Ex D IIC T6; Intrinsically-Safe: Ex ia IIC T6), allowing operation in hazardous areas.
● Specifically designed for the process industry and developed in accordance with IEC 61508, enabling use in SIL2 and SIL3 applications for safety-critical environments.
● Certified with CE, ensuring compliance with European safety, health, and environmental protection standards.
● Output options include relay, transistor, two-wire, and NAMUR for flexible system integration.
● The design, based on frequency change detection, offers strong anti-interference capabilities, ideal for applications in complex environments where the liquid is prone to foaming, bubbling, high viscosity, or vibration disturbances.
| Applicable liquid | Density | ≥0.5g/cm³ |
| Viscosity | 0.1～10000mPa.s ① | |
| Flow velocity | Max. 6m/s | |
| Probe data | Surface finish | Ra<0.5μm ② |
| Vibration frequency | ～1200Hz | |
| Fork length | 40mm | |
| Accuracy | Measurement error | ±1mm |
| Delay | 2mm | |
| Repeatability | 0.1mm | |
| Switching delay | When immersed | 0.5s |
| When laid bare | 1s | |
| Power supply | Relay | DPDT 20~253V AC/ 20~72V DC |
| Two-wire | 10～36V DC | |
| NAMUR | 8.2V DC | |
| Transistor | 6～48V DC | |
| Max. power consumption | 8VA(AC)；1.5W(DC) | |
| Output | Relay | 5A/253V AC/24V DC |
| Two-wire | 8mA/16mA，Alarm<2.3mA | |
| NAMUR | ≤1mA or ≥2.1mA， Fault ≤1mA | |
| Transistor | NPN/PNP | |
| Installation conditions | Process pressure | -1～64bar |
| Process temperature | Regular temperature: -50～150℃ | |
| High temperature: 50～250℃ | ||
| Ambient temperature | -40～70℃ | |
| Storage and transport temperature | -40～80℃ | |
| Overvoltage protection | Relay | Category III, class I |
| Two-wire | Category III, class II | |
| Certificates and approvals | SIL Qualification | SIL2 (HFT=0) / SIL3 (HFT=1) |
| China Compulsory Certification | CCC | |
| China Classification Society | CCS certificate for ships | |
| Explosion-Proof | Flameproof Enclosure: Ex d IIC T6～T1 Gb | |
| Intrinsic Safety: Ex ia IIC T6～T1 Ga | ||
| CE | LVD and EMC Certificates | |
| Ingress Protection | IP66/IP67 | |
| Materials | Housing | Aluminum alloy, , stainless steel |
| Ground terminal | 316L | |
| Thread connection | 316L | |
| Flange connection | 316L, 316L coated Enamel, ECTFE, PFA | |
| Fork | 316L, 316L coated Enamel, ECTFE, PFA | |
| Process seal | Klingersil C-4400 |
② Applicable: for Hygienic Ring-11 only.
● Point level detection for liquids in the food, beverage, and pharmaceutical industries.
● Powders such as milk powder, flour, cellulose, sugar, beans, spices, and coffee beans.
● Liquids like water, cream, soybean, and liquor.Suitable for storage tanks, stirring tanks, mixer tanks, and filter tanks.
● Reliable performance in foamy and adhesive liquids.
● Sanitary connections available for hygienic applications.
