Ring-11 High-Temperature Fork Level Switch
The Ring-11 High-Temperature Tuning Fork Level Switch, certified with SIL2/3, intrinsic safety, and explosion-proof certifications, is a reliable control switch for high-temperature media, with a process temperature up to 250°C.
The Ring-11 High-Temperature Tuning Fork Level Switch, certified with SIL2/3, intrinsic safety, and explosion-proof certifications, is a highly reliable control switch specifically designed for level measurement of high-temperature media. The instrument features a high-temperature resistant design, with a process temperature capability of up to 250°C, leading the industry.
The Ring-11 High-Temperature Tuning Fork Level Switch is an enhanced version of the standard temperature tuning fork level switch, featuring a high-temperature resistant structural design. This is achieved by adding an extension tube between the process connection and the instrument head, which increases the thermal conduction distance and reduces the temperature at the instrument head. It also uses high-temperature resistant piezoelectric ceramic components and wires.
The working principle is the same as that of the standard temperature tuning fork level switch. It utilizes a piezoelectric device to drive and detect the vibration of the tuning fork. When the fork comes into contact with the measured liquid, its resonance frequency significantly decreases. The change in vibration frequency is directly reflected in the output signal of the piezoelectric sensor. The detection circuit then interprets the frequency change and outputs a switching signal.
● High-Temperature Resistance: Capable of handling process temperatures up to 250°C, leading the industry in high-temperature level measurement.
● Compact Design: With a fork body length of just 40mm, it is ideal for level measurement in narrow spaces such as pipelines and tight installations.
● Precise Measurement: Tuned to detect media with a minimum density of 0.5g/cm³, making it suitable for a wide range of materials.
● Strong Anti-Interference: Resistant to foam, bubbles, viscosity, vibrations, and variations in liquid properties, ensuring reliable measurements in challenging conditions.
● Versatile Signal Outputs: Offers 4 signal output options, including relay, two-wire, NAMUR, and transistor for flexible integration with existing systems.
● Industry Certifications: Certified with SIL2/3, 3C, CE, as well as intrinsic safety, explosion-proof, and flameproof certifications, ensuring safety and compliance in hazardous environments.
● High Reliability: Based on frequency change detection, ensuring consistent and dependable performance over time.
| 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.
● Level measurement in raw material storage tanks, tankers, and reactors (strongly corrosive and high-temperature liquids) in the chemical fragrance production process.
The fork body and process connection parts in contact with the measured liquid are coated with ECTFE or PFA, making it suitable for measuring highly acidic and alkaline liquids. The process temperature can reach up to 250°C.
● Level measurement of liquids such as toluene, cyclohexane, and other similar substances.
● Level measurement and control in processes with temperatures exceeding 150°C.
