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.
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