Insulated Magnetic Level Gauges Self-Monitoring RF Point Level
Controller
●Working Principle
Based on the principle of conductivity, the probe and the tank wall
can serve as the two poles,the air and the insulated element
becomes the medium in this situation. When the level of material
rise to the probe, the medium air will be substituted by material,
so the dielectric constant would be changed. As the dielectric
constant of material is larger than that of air (=1), which will
change the conductivity and impedance at the main time, the circuit
board of L3522C will detect the change and enlarge it, by compare
with the reference point, the circuit will generate a relay output
accordingly.
The set of reference point is important for the unit generate a
correct output.
Based the technical of RF, a radio frequency will be sent to the
working
element and the guard element, which will cut off the current
generated by
the adhered material on the element.
By this way, the probe can measure the level of material without
the influence of adhered material.
●Description
L3522C is designed and produced based on the technology of Princo’s
point level controller.
The technique of adhering proof circuit can ensure the accurate
measuring of actual level of material. With the technique of
surface sealing, the L3522C can work more reliable. The function of
“Self-monitoring” can let user know the working status of the
circuit easily. The improved sensitivity enables it to measure the
level of process material with lower dielectric.
The standard probe of L3522C is L863C, of which the diameter
is10mm, and the length of guard element is 150mm, the total length
of the probe is 450mm. The flat probe L890C is suitable for
measuring massive material which can avoid the damage of probe pole
caused by material wallop. And, L863WC flexible wire probe and
L864C probe for high temperature are available.
●Features
■ Suitable for wide application: can be used to measure almost all
kinds of material, fly ash, grain, powder, liquid, slimy material,
electric material and non-electric material.
■ Adhering proof circuit: ignore the effect of adhered material.
■ Easy-on probe: No wire used to connect the probe and the
controller, which allow the user remove it easily.
■ Suitable for application of high temperature and low temperature:
-184℃ to 260℃, high temperature probe also be available.
■ Large output capacity: 2.5A/230VAC or 5A/26VDC relay, with status
light, time delay for 0~30 seconds.
■ Technic of surface sealing: Anti-vibration, ensure the steady
work of circuit board.
■ Technic of hydraulic pressure: Strength the probe for pressure
■ Warranty: Ten years
■ Self-monitoring: The electric circuit would run and check the
working status, the status light would turn green when a problem
occurred.
●Model: L3522C-XXX (See the specification for detail)
●Specifications
Relay:DPDT contacts rated at 2.5A/230VAC, or 5A/26VDC
Time Delay:0 to 30 seconds, field changeable
Power Supply:220VAC or 24VDC
Power:3 watts
Sensitivity:0.1pF~1500pF
Process Temperature:-184℃ to 260℃ (Ceramic probe can be chose for
temperature exceed 260℃)
Ambient Temperature:-40℃ to 66℃
Fail-safe Mode:Fail-safe low level or high level, KO,KC field
changeable
Housing:Heavy duty cast aluminum housing, IP65
Smart:With the function of “Self-monitoring”
Ex-proof:Exdia II CT4
●Probe Specifications
Mounting Screw:1” NPT
Material:SS,
Wetted Part Material:SS
Electrical Conduit Connector:PG11 or 3/4” NPT
Relation between Operating Pressure and Temperature:70kg/cm2@-184℃
70kg/cm2@38℃
31.5kg/cm2@149℃
24.7kg/cm2@205℃
0kg/cm2@260℃
RF level controller of high temperature type, anti-corrosive type, with cable probe or
plate probe can be optional.
