Ring-11 Corrosion-Resistant Fork Liquid Level Switch
The Ring-11 Corrosion-Resistant Fork Liquid Level Switch has obtained SIL2/3 Certification and Intrinsically Safe and Explosion-Proof Certifications.
The Ring-11 Corrosion-Resistant Fork Liquid Level Switch has received SIL2/3 Certification and Intrinsically Safe and Explosion-Proof Certifications. Designed for measuring highly corrosive acidic and alkaline liquids, the wetted parts can be coated with ECTFE, PFA, enamel, or other materials, depending on the liquid’s corrosion strength. For high-temperature and high-pressure environments, the switch can be equipped with an extension tube and a high-pressure protective gas-tight insulating sleeve to ensure reliable operation.
To prevent erosion from highly corrosive liquids, the fork body and process connection of the Ring-11 Corrosion-Resistant Fork Liquid Level Switch are coated with materials such as ECTFE, PFA, and enamel, significantly enhancing their corrosion resistance. This coating ensures the instrument’s stable and reliable performance when measuring highly corrosive liquids.
Beyond these material differences, the working principle of the Ring-11 Corrosion-Resistant Fork Liquid Level Switch remains the same as that of the standard Ring-11 series Liquid Level Switches. The switch uses piezoelectric devices to drive and detect the vibration of the fork body. When the fork body makes contact with the measured liquid, its resonance frequency decreases significantly. This change in vibration frequency is directly reflected in the output signal of the piezoelectric detection device. The detection circuit analyzes the frequency change and outputs a switch signal.
● Compact design: The fork body is only 40mm long, ideal for liquid level measurement in narrow spaces like pipelines.
● Precision tuning: The fork body is precisely tuned to measure liquids with a minimum density of just 0.5g/cm³.
● Anti-interference technology: The device is unaffected by foam, bubbles, viscosity, vibration, or other liquid characteristics.
● High-temperature resistance: Designed to withstand process temperatures up to 250°C, setting industry standards for temperature tolerance.
● Flexible output options: Provides four signal output options: relay, two-wire, NAMUR, and transistor.
● High-pressure protection: Can be equipped with a high-pressure protective gas-tight insulating sleeve, making it suitable for measuring high-pressure, corrosive, hazardous liquids.
● Certified for safety and reliability: SIL2/3, 3C, CE, and intrinsically safe and explosion-proof certifications ensure reliable performance in hazardous environments.
● Industry-leading reliability: Based on the innovative design of detecting frequency changes, providing high levels of reliability and durability.
| 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 | 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.
● Ring-11 Corrosion-Resistant Fork Liquid Level Switch is perfect for liquid level measurement in various industrial applications, including highly corrosive and high-temperature environments.
● Other highly corrosive liquids: Provides accurate liquid level measurement and control for a wide range of corrosive liquids in various industrial processes.
● Chemical fragrance production: Ideal for raw material storage tanks, containers, and reaction kettles handling highly corrosive and high-temperature liquids. The fork body and flange parts are coated with ECTFE and PFA coatings for superior resistance, and an extension tube is added between the head and the flange to protect the system.
● Acid storage: Reliable for high and low liquid level measurement in storage tanks containing sulfuric acid, hydrochloric acid, hydrofluoric acid, and other strong acids.
● Pesticide factories: Used for liquid level measurement in desolventizing kettles handling petroleum ether mother liquor.
