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, 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. The special setting of gas-tight leadthrough makes Ring-11 effectively prevent accidental leakage from high-pressure strong corrosive liquids.
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 \*
GB3①
|
Flow
velocity
|
Max
6m/s
|
Probe
data
|
Surface finish
|
Ra<0.5μm②
|
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
|
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
|
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, Ex tD A21 IP66 T80~440℃
Intrinsic
safety: Ex ia IIC T6~T1 Ga, Ex iaD 20 T85~450℃
|
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 or 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.
For more information, please Contact:sales@jiweimeter.com