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.
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Applicable
liquid
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Density
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＞ 0.5g/cm3
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Viscosity
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0.1~10000mPa.s①
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Flow velocity
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Max
6m/s
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Fork
data
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Vibration frequency
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~1200Hz
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Fork length
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40mm
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Accuracy
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Measurement
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±1mm
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Delay
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2mm
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Repeatability
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0.1mm
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Switching
delay
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When
immersed
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0.5S
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When
laid bare
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1S
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Power
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Relay
output
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20～250VAC/20～72VDC
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Two-wire
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10～36VDC
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Power consumption
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AC1-8VA/DC1.5W
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Output
variable
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Relay
output
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DPDT,5A/253VAC/24VDC
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Two-wire
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8mA/16mA,Alarm<2.3mA
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Ambient conditions
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Process pressure
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-1～64bar
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Process temperature
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-50℃～250℃
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Ambient temperature
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-40℃～70℃
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Storage and transport temperature
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-40℃～80℃
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Electrical protections
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Relay
output
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categoryIII, class I
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Two-wire
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categoryIII, class II
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Approvals
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Protection rating
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IP66/67
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Explosion-proof
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EX
d IIC T6, EX ia IIC T6
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SIL
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Under evaluation
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Materials
optional
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Housing
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Plastic, Aluminum, Stainless
steel
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Ground terminal
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316L
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Thread fitting
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316L
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Flange fitting
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316L, 316 enameled, 316L with ECTFE coating, 316L with
PFA coating
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Fork body
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316L, 316 enameled, 316L with ECTFE coating, 316L with
PFA coating
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Process
seal
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Klingersil C-4400
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● 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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