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Liquid Level Switch

Ring-11 Liquid Level Switch

Passed SIL2 / SIL3 Functional Safety Assessment, certified for both Intrinsic Safety and Flameproof Enclosure explosion protection. With only 40mm fork length, the lowest measurable medium density can be as low as 0.5g/cm³. Process temperature can reach up to 250℃. Typical applications:

 Liquefied natural gas (LNG) with the density of 0.56g/cm³ in transport pipelines.
 Pipelines in pump protection system.

 Herbicides and fungicides in insecticide Factory.

 Storage tanks of oil, crude oil, gasoline and lubricating oil.


  • 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 so the lowest measurable density can be as low as 0.5g/cm³. Jiwei Ring-11 liquid level switch is excellent in level measurement for acids like HCL, H2SO4, H2SO3, and alkali liquids, syrup, medical liquids, industrial wastewater, etc. And particularly, it is suitable for pressured liquefied gas (such as LNG) and applications under complicated working conditions where measured liquid is easy to foaming, bubbling or with high viscosity and under vibration disturbance environment etc. 


    Ring-11 Liquid Level Switch passed SIL2 / SIL3 Functional Safety Assessment, as well as certified for both Intrinsic Safety and Flameproof Enclosure explosion protection. Currently, Jiwei has been granted an invention patent (ZL201510735568.2) on Ring-11 Liquid Level Switch. 


  • Piezoelectric devices are utilized to achieve vibration drive and detection. Once resonant vibrating fork comes in contact with measured medium, vibration frequency of forks substantially decreases, and the output signal from piezoelectric detection device decreases accordingly. Then an integrated circuit is designed to analyze the signal from piezoelectric device and output a switch signal as a result.


  •  With only 40mm fork length, specially designed for pipelines and other applications with constricted space.
     High sensitivity due to the precisely pre-adjusted harmonic resonant frequency of fork, the lowest measurable medium density can be as low as 0.5g/cm³.
     With strong disturbance resistance ability, not influenced by foam, bubbles, viscosity, vibration and other liquid characteristics.
     Industry-leading performance for high temperature working environment. Process temperature can reach up to 250℃.
     Four optional outputs: relay output, two-wire system, NAMUR and transistor.
     Passed SIL2 / SIL3 Functional Safety Assessment, as well as certified for both Intrinsic Safety and Flameproof Enclosure explosion protection.

     High reliability due to the detection of vibration frequency.


  • Applicable liquid

    Density

    ≥0.5g/cm³

    Viscosity

    0.110000mPa.s= 1 \* GB3

    Flow velocity

    Max 6m/s

    Probe data

    Surface finish

    Ra<0.5μm

    Vibrating 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 output

    20253V AC/2072V DC

    Two-wire

    1036V DC

    NAMUR

    8.2 V DC

    Transistor

    6~48V DC

    Maximum power consumption

    8VA (AC)1.5W (DC)

    Output

    Relay output

    DPDT, 5A/253V AC/24V DC

    Two-wire

    8mA/16mA, Alarm <2.3mA

    NAMUR

    ≤1mA or ≥2.2mAFault≤1mA

    Transistor

    NPN/PNP

    Working environment

    Process pressure

    -164bar

    Process temperature

    Regular:-50150,

    High temperature:-50250

    Ambient temperature

    -4070

    Storage and transport temperature

    -4080

    Overvoltage protections

    Relay output

    Category III, class I

    Two-wire

    Category III, class II

    Approvals

    SIL Certificate

    SIL2HFT=0)/SIL3HFT=1)

    Explosion proof types

    Flameproof enclosure: Ex d IIC T6~T1 Gb,

    Intrinsic safety: Ex ia IIC T6~T1 Ga

    CE

    LVD and EMC certificates

    Protection rating

    IP66/IP67

    Materials

    External Housing

    Aluminum Alloy

    Ground terminal

    316L

    Thread fitting

    316L

    Flange fitting

    316L, 316L with enamel coating, ECTFE coating or PFA coating (Optional)

    Fork body

    316L, 316L with enamel coating, ECTFE coating or PFA coating (Optional)

    Process seal

    Klingersil C-4400

    Note:  = 1 \* GB3 Assume the medium density equals to 1.

    ②Applicable: for food grade Ring-11 only.



  •  Liquefied natural gas (LNG) with the density of 0.56g/cm³ in transport pipelines.
     Pipelines in pump protection system.

     Herbicides and fungicides in insecticide Factory.

     Storage tanks of oil, crude oil, gasoline and lubricating oil.


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