Ring-11 Liquid Level Switch Catalog

Product catalog summary

Overview
The Ring-11 Liquid Level Switch by Shenzhen Jiwei Automations Ltd. is a compact and reliable instrument designed for liquid level detection and control, particularly suitable for pipelines and applications with limited space. It operates on the principle of fork resonance, where the vibration frequency decreases upon contact with a liquid, triggering a switch signal.

Key Features

Compact design with a 40mm fork length.
High sensitivity with a measurable medium density as low as 0.5g/cm³.
Resistant to disturbances such as foam, bubbles, and vibrations.
Operates effectively in high-temperature environments up to 250℃.
Four output options: relay, two-wire system, NAMUR, and transistor.
Certified for SIL2/SIL3 Functional Safety, Intrinsic Safety, and Flameproof Enclosure explosion protection.

Technical Specifications

Applicable for liquids with density ≥0.5g/cm³ and viscosity 0.1–10000mPa.s.
Maximum flow velocity of 6m/s.
Measurement accuracy of ±1mm with a repeatability of 0.1mm.
Power supply options include relay output (20–253V AC/20–72V DC), two-wire (10–36V DC), NAMUR (8.2 V DC), and transistor (6–48V DC).
Process pressure range from -1 to 64 bar and temperature range from -50 to 250℃.
Materials include aluminum alloy housing and 316L stainless steel for various fittings.

Installation and Wiring

Ensure the fork wing surface is parallel to the medium's movement direction.
Avoid installation near inlets and outlets to prevent impact damage or false signals.

Approvals and Certifications

Available in non-explosion-proof, Intrinsic Safety, Flameproof Enclosure, and Gas/Dust Explosion-proof versions.
Process temperature options range from -50 to 250℃, with or without gas-tight leadthrough.
Various process fittings and electronics configurations are available to suit different applications.

Applications

Suitable for use with liquefied natural gas, pipelines in pump protection systems, and in insecticide factories.

Catalog excerpts

Ring-11 Liquid Level Switch Catalog SHENZHEN JIWEI AUTOMATIONS LTD.

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Ring-11 Liquid Level Switch Overview Ring-11 Liquid Level Switch is a highly reliable instrument for liquid level detection and control. The fork length is only 40mm which makes Ring-11 applicable not only for vessels, process tanks and storage tanks, but also particularly for pipelines or other applications with constricted space. Based on the fork resonant principle, when a fork vibrates in harmonic resonance comes in contact with measured liquid, its vibrating frequency will greatly decrease. The fork’s harmonic resonant frequency has been precisely pre-adjusted to achieve high sensitivity...

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www.jiweiauto.com Typical applications Liquefied natural gas and LNG with the density of 0.56g/cm³ in transport pipelines. Pipelines in pump protection system. Herbicides and fungicides in insecticide Factory. Technical data Applicable liquid Probe data Accuracy Switching delay Power supply Working environment Overvoltage protections Density Viscosity Flow velocity Surface finish Vibrating frequency Fork length Measurement error Delay Repeatability When immersed When laid bare Relay output Two-wire NAMUR Transistor Maximum power Relay output Two-wire NAMUR Transistor Process pressure Process...

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www.jiweiauto.com Dimensional drawing SHENZHEN JIWEI AUTOMATIONS LTD.

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www.jiweiauto.com Wiring plan Relay output (DPDT) ①: Power terminal ②③： Relay output (DPDT) Two-wire output ①: Power terminal /output (8/16mA) NAMUR output ①: Power terminal, ouput (≥2.1mA/1.0mA) Installation diagrams Notes：  Surface of fork wing should be parallel to the movement direction of measured medium, as showing in Fig.1and Fig.2.  To prevent the instrument from filling impact damage or generating false signals, avoid installing instrument near inlet and outlet, as showing in Fig.3 and Fig.4.

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www.jiweiauto.com Order information Non-explosion-proof Intrinsic Safety (Ex ia IIC T1～T6 Ga) Flameproof Enclosure (Ex d IIC T1～T6 Gb) Gas/Dust Explosion-proof (Ex d IIC T6~T1 Gb+ Ex tD A21 IP66 T80℃~440℃) (SIL Functional Safety Assessment available for all approvals) Process temperature Process fitting C -50～150℃ H -50～250℃ A -50～150℃ / with gas-tight leadthrough B -50～250℃ / with gas-tight leadthrough TC TD TH TM FA FB FC FD FE FF FG FH CB XX Thread G¾'' A Thread ¾'' NPT Thread G1'' A Thread 1'' NPT Flange DN25 PN40/316L Flange DN50 PN40/316L Flange DN25 PN40/ECTFE coating Flange DN50 PN40/ECTFE...

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