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Liquid Level Switch

Ring-11 Liquid Level Switch

Fork length is only 40 mm, the lowest measurable density is 0.5g/cm3, and the process temperature is up to 250 ℃. It is typically applied in fields as follow:

● Used in the measurement of liquefied natural gas (LNG) with the density of 0.56g/cm3.
● Widely used in producing chemical spices, which usually produce under highly corrosive condition and high  temperature environment.
● Widely mounted in storage tanks of petroleum,  crude oil, gasoline, lubricating oil, etc.
● Widely mounted in pipeline for pump protection.


  • Ring-11 is a high-reliable and compact level switch, which specializes in liquid level measurement and it is designed with only 40 mm length of the fork body. It is applicable to measure liquid level of vessels, containers, and storage tanks. In addition, based on the design principle, Ring-11 detects vibration frequency change of the fork body when fork body is immersed in medium. Thus, it is suitable to use in foams, air bubbles, viscous liquid and conditions with complex vibrating interference. Ring-11 is particularly aimed to measure the level of low density liquid with the lowest measurable density of 0.5g/cm3.


  • Ring-11 uses piezoelectric devices to achieve vibration drive and detection. The frequency of tuning fork will obviously decreases if it is covered by liquid. This change of vibration frequency directly reflect on the output signal of the piezoelectric detection device, thus, the detection circuit responds to the change of frequency and converts into a switching output signal.


  • (1) Ring-11 adopts compact and lightweight design for side or top mounting. Its length is only 40mm length, especially suitable for pipelines’ measurement.

    (2) Measurable liquid’s density is as low as 0.5g/cm3.

    (3) Strong anti-interference feature, can work in foams, air bubbles, viscous liquid and conditions with complex vibrating interference. 

    (4) Process temperature is as high as 250℃, which is industry-leading.

    (5) Based on the detection of vibration frequency changing of fork body, the measurement has high reliability.

    (6) Made of strong anti-corrosive materials, such as 316L, 316 enameled, 316L with ECTFE coating, 316L with PFA coating.

  • Applicable liquid

    Density

    0.5g/cm3

    Viscosity

    0.1~10000mPa.s

     Flow velocity

    Max 6m/s

    Fork data

    Vibration frequency

    ~1200Hz

    Fork length

    40mm

    Accuracy

    Measurement

    ±1mm

    Delay

    2mm

    Repeatability

    0.1mm

    Switching

    delay

    When immersed

    0.5S

    When laid bare

    1S

    Power

    Relay output

    20250VAC/2072VDC

    Two-wire

    1036VDC

    Power consumption

    AC1-8VA/DC1.5W

    Output variable

    Relay output

    DPDT,5A/253VAC/24VDC

    Two-wire

    8mA/16mA,Alarm<2.3mA

    Ambient conditions

    Process pressure

    -164bar

    Process temperature

    -50250

    Ambient temperature

    -4070

    Storage and transport temperature

    -4080

    Electrical protections

    Relay output

    categoryIII, class I

    Two-wire

    categoryIII, class II

    Approvals

    Protection rating

    IP66/67

    Explosion-proof

    EX d IIC T6, EX ia IIC T6

    SIL

    Under evaluation

    Materials optional

    Housing

    Plastic, Aluminum, Stainless steel

    Ground terminal

    316L

    Thread fitting

    316L

    Flange fitting

    316L, 316 enameled, 316L with ECTFE coating, 316L with PFA coating

    Fork body

    316L, 316 enameled, 316L with ECTFE coating, 316L with PFA coating

    Process seal

    Klingersil C-4400


  • ● Used in natural gas transmission pipeline to measure the liquefied natural gas (LNG) with the density of 0.56g/cm3. The fork body of Ring-11 is only 40mm long, with the lowest measurable density of 0.5g/cm3, especially suitable for LNG pipeline level monitoring, and provides protection in hazardous environments.


    ● Widely used in chemical spices production under strong corrosive condition and high temperature environment. In order to make Ring-11 adapt to acid and alkali liquid, fork body and flange are coated with ECTFE or PFA, and the working temperature is up to 250 ℃.


    ● Widely mounted in storage tanks to measure petroleum, crude oil, gasoline, lubricant, etc. Also, Ring-11 has been approved by dual certifications of Intrinsic Safe and Explosion-Proof (Intrinsically Safe Exia IIC T6, flame-proof Exd IIC T6), so Ring-11 is an ideal choice for petroleum and petrochemical industry.


    ● Widely mounted in pipeline for pump protection system.



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