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 obtained SIL2/3 Certification and Intrinsically Safe and Explosion-Proof Certifications. Depending on the corrosion strength of the liquid medium, the wetted parts can be coated with ECTFE, PFA, enamel, etc., making it suitable for measuring highly corrosive acidic and alkaline liquids. For high-temperature and high-pressure environments, it should also include an extension tube and be equipped with a high-pressure protective gas-tight insulating sleeve.
To avoid erosion from highly corrosive liquids, the fork body and process connection are coated with ECTFE, PFA, enamel, etc., enhancing their corrosion resistance. This ensures the instrument’s stable and reliable application in measuring highly corrosive liquids. Other than these differences, the working principle of the Ring-11 Corrosion-Resistant Fork Liquid Level Switch is identical to that of the Ring-11 series Liquid Level Switches. It uses piezoelectric devices to drive and detect the vibration of the fork body. When the fork body comes into contact with the measured liquid, its resonance frequency significantly decreases. 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.
● Strong corrosion resistance, wider application range.
● The fork body is only 40mm long, making it particularly suitable for liquid level measurement in narrow spaces such as pipelines.
● The fork body is precisely tuned and can measure media with a minimum density of only 0.5g/cm³.
● Strong anti-interference ability, unaffected by foam, bubbles, viscosity, vibration, and liquid characteristics.
● High-temperature resistance design, with process temperatures up to 250°C, industry-leading.
● Provides four signal output options: relay, two-wire, NAMUR, and transistor.
● Can be equipped with a high-pressure protective gas-tight insulating sleeve, particularly suitable for measuring high-pressure, corrosive hazardous liquids.
● Certified with SIL2/3, 3C, CE, and intrinsically safe, explosion-proof certifications.
● High reliability based on the design of detecting frequency changes.
| 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.
● Liquid level measurement in raw material storage tanks, containers, and reaction kettles (highly corrosive, high-temperature liquids) in chemical fragrance production.
This product adapts to the measurement of highly acidic and alkaline liquids with process temperatures up to 250°C by coating the fork body and flange parts that contact the measured liquid with ECTFE and PFA coatings, and adding an extension tube between the head and the flange.
● High and low liquid level measurement in storage tanks for sulfuric acid, hydrochloric acid, hydrofluoric acid, etc.
● Liquid level measurement in desolventizing kettles with petroleum ether mother liquor in pesticide factories.
● Liquid level measurement and control for other highly corrosive liquids.
