RF Admittance Level Switch

RF Admittance Level Switch

This product series is a fundamentally intelligent radio frequency capacitive level controller. Based on the capacitive principle, this series offers excellent performance with advantages such as good stability, high measurement accuracy, and wide applicability. Compared to traditional level switches, this series features a modular design and a liquid crystal display (LCD) debugging module.  It requires no external auxiliary equipment and can automatically acquire and display the measured material values, providing users with more reliable measurement data. The LCD debugging module has dual functions of debugging and display, allowing users to easily and intuitively read all the necessary data, simplifying the debugging process.

Detailed Instructions:

Empty Bin Adjustment, Do Not Touch the Sensing Rod
1. Before debugging, please check the circuit connections to ensure they are correct:
a. Turn the fine adjustment and coarse adjustment knobs clockwise to the end (as shown in the figure);
b. Turn the delay switch knob counterclockwise to the end (no delay);
c. Adjust the coarse adjustment knob counterclockwise until the probe indicator light just turns red, then slightly adjust it back until the indicator light just turns green. Do not touch the coarse adjustment knob again;
d. Adjust the fine adjustment knob counterclockwise until the indicator light turns red, then slightly adjust it back until the indicator light just turns green; Please do not forcefully adjust the knobs on the panel to avoid damaging the instrument;
2. H (High) Level and L (Low) Level Fault Alarm:
a. H (High) level fault alarm: When the probe detects that there is no material in the bin, a high-level alarm will occur, COM/NO closes, and COM/NC opens;
b. L (Low) level fault alarm: When the probe detects that there is no material in the bin, a low-level alarm will occur, COM/NO opens, and COM/NC closes; The high and low level alarms can be set by the jumper on the panel;
3. Delay Setting:
Using the delay setting can prevent the relay from "jittering" due to the stirring of materials in the bin. The maximum delay time for CK201K is 30 seconds (use the smallest possible delay);

Basic Parameters
1. Power Supply: 220VAC 50Hz or 24VDC (24VDC is recommended);
2. Relay Contacts: 2 sets of SPDT, 5A 220VAC;
3. Material: Sensing rod: SUS304/316, Insulation sheath: PP or Teflon;
4. Sensitivity: 0.5pf~750pf;
5. Operating Temperature: Probe operating temperature range: -184℃～260℃, Circuit part temperature resistance: -40℃～80℃;
6. Connection Thread: 1” NPT or 1”PF;
7. Delay Time: 0~30s adjustable;
Working Principle
The radio frequency admittance level switch is based on radio frequency capacitance technology: a radio frequency is applied to the probe, continuously analyzing the surrounding environment.  Since the dielectric constant and conductivity of all media are different from air, the small change in capacitance caused when the probe comes into contact with the medium is detected by the circuit and converted into a switch signal output. Its unique anti-adhesion circuit only responds to changes in capacitance caused by changes in material level, thus eliminating false signals caused by material accumulation. Installation and Operating Instructions
1. When the probe is installed horizontally, it should be angled downwards at 20° to the horizontal plane to reduce material impact and increase sensing sensitivity;
2. When the probe is installed through the container wall, the protective sleeve (insulating part) should be 2 inches longer than the thickness of the accumulated material on the container wall;
3. To prevent rainwater from entering the junction box in outdoor environments, the cable entry point must be vertically downwards when installed horizontally;
4. During installation, the angle of repose formed by the accumulated material when the measured medium is not fed from the center of the silo should be fully considered;
5. Confirm that the power supply voltage is the same as the voltage of the selected product. Connect the cables according to the wiring diagram and the markings on the terminal block. After connecting, tighten the junction box cover;
6. The control circuit load must not exceed the load capacity (use less than the relay capacity). Note: Do not use any lubricant on the threaded connection between the probe and the container wall. If necessary, Teflon tape can be used for sealing. In this case, the installer should check the circuit with a multimeter and ensure that the resistance between the container wall and the probe is less than 1 ohm!

Precautions
1. Ensure the junction box is sealed;
2. Regularly check that all components are securely connected;
3. For rod lengths greater than 500mm, top mounting should be used whenever possible to prevent bending and malfunction;
4. GND is the ground wire.

Common problems and troubleshooting

If the above issues do not apply, please contact our company and our technical staff will assist you.
Routine Maintenance
1. After the product has been in use for a period of time, regularly clean any debris from the sensor rod.
2. Check the junction box and all connections for looseness.

Certificate  Approved