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Shenzhen Jiwei Automations Ltd.

Address：5th Floor, Baoli Building, No. 3162 Longgang Avenue, Shenzhen, P. R. China.
Tel：+86 755 28407683

Liquid Level Switch

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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.

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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	0.1～10000mPa.s^{= 1 \* GB3}^①
	Flow velocity	Max 6m/s
Probe data	Surface finish	Ra<0.5μm^②
	Vibrating frequency	～1200Hz
	Fork length	40mm
Accuracy	Measurement error	±1mm
	Delay	2mm
	Repeatability	0.1mm
Switching delay	When immersed	0.5s
Switching delay	When laid bare	1s
Power supply	Relay output	20～253V AC/20～72V DC
	Two-wire	10～36V 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 ≥2.2mA，Fault≤1mA
	Transistor	NPN/PNP
Working environment	Process pressure	-1～64bar
	Process temperature	Regular:-50～150℃, High temperature:-50～250℃
	Ambient temperature	-40～70℃
	Storage and transport temperature	-40～80℃
Overvoltage protections	Relay output	Category III, class I
Overvoltage protections	Two-wire	Category III, class II
Approvals	SIL Certificate	SIL2（HFT=0)/SIL3（HFT=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 ①Assume 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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