Ring-11 Sanitary Liquid Level Switch

Ring-11 Sanitary Liquid Level Switch is a vibration level switch with a polished probe and tuning fork for liquid hygienic applications, as well as for universal use in all liquids. It is used preferably in storage tanks, mixing vessels and pipes, where the internal and external hygiene requirements are particularly stringent.

Piezoelectric devices are utilized to achieve vibration drive and detection. Once resonant vibration fork comes into contact with application 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.

●　The surface finish Ra<0.5μm.

●　Polished tuning fork with a large choice of hygienic process fittings.

●　Optional gas-tight lead-through for high pressure applications.

●　The compact fork body is only 40mm long, especially suitable for liquid level measurement in narrow space.

●　After precise tuning, the two forks are completely symmetrical with completely consistent vibration and higher sensitivity.

●　The measurable medium density is as low as 0.5g/cm³, can be applied to liquid level measurement of most liquids.

●　The process temperature reaches 250 ℃ (482°F).

●　With higher Intrinsically-safe and Flame-proof Certification (Flame-Proof: Ex D IIC T6; Intrinsically-Safe: Ex ia IIC T6)，allowing the operation in hazardous areas.

●　Specialized for the process industry and developed according to IEC 61508 to be used directly in SIL2 and SIL3 applications.

●　With CE Certificates, CCC Certificates and CCS Certificate for ships (China Classification Society).

●　Output options: relay, transistor, two-wire and NAMUR.

●　The design based on the changing detection frequency has strong anti-interference ability,suitable for the applications under complicated working conditions where the measured liquid is easy to foaming, bubbling or with high viscosity and under vibration disturbance environment etc.

Applicable liquid	Density	≥0.5g/cm³
	Viscosity	0.1～10000mPa.s ①
	Flow velocity	Max. 6m/s
Probe data	Surface finish	Ra<0.5μm ②
	Vibration 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	DPDT 20~253V AC/ 20~72V DC
	Two-wire	10～36V DC
	NAMUR	8.2V DC
	Transistor	6～48V DC
	Max. power consumption	8VA(AC)；1.5W(DC)
Output	Relay	5A/253V AC/24V DC
	Two-wire	8mA/16mA，Alarm<2.3mA
	NAMUR	≤1mA or ≥2.1mA， Fault ≤1mA
	Transistor	NPN/PNP
Installation conditions	Process pressure	-1～64bar
	Process temperature	Regular temperature: -50～150℃
	Process temperature	High temperature: 50～250℃
	Ambient temperature	-40～70℃
	Storage and transport temperature	-40～80℃
Overvoltage protection	Relay	Category III, class I
Overvoltage protection	Two-wire	Category III, class II
Certificates and approvals	SIL Qualification	SIL2 (HFT=0) / SIL3 (HFT=1)
	China Compulsory Certification	CCC
	China Classification Society	CCS certificate for ships
	Explosion-Proof	Flameproof Enclosure: Ex d IIC T6～T1 Gb
	Explosion-Proof	Intrinsic Safety: Ex ia IIC T6～T1 Ga
	CE	LVD and EMC Certificates
	Ingress Protection	IP66/IP67
Materials	Housing	Aluminum alloy, , stainless steel
	Ground terminal	316L
	Thread connection	316L
	Flange connection	316L, 316L coated Enamel, ECTFE, PFA
	Fork	316L, 316L coated Enamel, ECTFE, PFA
	Process seal	Klingersil C-4400