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 approvals, is a highly reliable control switch specifically designed for level measurement of high-temperature media. In addition to its standard 280°C temperature resistance, Jiwei has pioneered an ultra-high temperature version rated up to 400°C, marking a leading breakthrough in China for extreme temperature level measurement.
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 280°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.
● Industry Standards Compliance: Complies with HACCP, and 3A standards, ensuring safety, hygiene, and reliability in the food and pharmaceutical industries.
● 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.s① | |
| Flow velocity | Max. 6m/s | |
| Probe data | Surface finish | Ra<0.5μm② |
| 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 supply③ | 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 conditions④ | Process pressure | -1～64bar |
| Process temperature | Regular temperature: -50～150℃ | |
| High temperature: -50～280℃ | ||
| Ultra-high temperature: -50～400℃⑤ | ||
| 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 Qualification⑥ | SIL2 (HFT=0) / SIL3 (HFT=1) |
| Explosion-Proof | Dust Flameproof Enclosure: Ex db IIC T6…T1 Gb Ex tb ⅢC T440℃…T80℃ Db | |
| Intrinsic Safety: Ex ia IIC T1…T6 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 |
Note：
① Assume the medium density equals to 1.
② Applicable: for Hygienic Ring-11 only.
③ The voltage of explosion-proof models can be executed according to the technical requirements on the Explosion-proof Certificate.
④ The relationship between the process temperature, medium temperature and ambient temperature of explosion-proof models can be executed according to the technical requirements on the Explosion-proof Certificate.
⑤ Cover the exhaust port with the whistle, keeping the whistle’s outlet side close against the port wall. Gradually increase the cooling gas flow until the whistle emits a sound—this indicates the minimum required flow rate.
⑥ Comply with international standard IEC61508 (national standard GB/T20438).
● 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 280°C.
● Level measurement of liquids such as toluene, cyclohexane, and other similar substances.
● Level measurement and control in processes with temperatures exceeding 150°C.
