FTE30 Rotary Paddle Level Switch Overview
The FTE30 rotary paddle level switch is a rotary paddle type level switch used for level detection of solid particles or powders, widely applied in chemical, building materials, grain, metallurgy, and other industries. Its core principle is that a synchronous motor drives the paddle to rotate. When the paddle contacts the material and is obstructed, the detection mechanism outputs a switch signal. The instrument has a simple structure and high reliability, making it suitable for high and low level alarm or interlock control in silos.
Download FTE30 Rotary Paddle Level Switch Chinese Manual.pdf
Working Principle and Core Advantages
Working Principle
The FTE30 rotary paddle level switch adopts a combined structure of a micro switch and a clutch. When the paddle does not contact the material, the motor rotates normally; when the paddle is blocked by the material, the main shaft is obstructed, the clutch disengages and triggers the micro switch, outputting a material-present signal. After the material drops, the paddle resumes rotation and the switch resets.
Main Advantages
- High reliability: no complex electronic components, strong resistance to dust and adhesion.
- Wide applicability: can detect powdery, granular, and lumpy solid materials.
- Easy installation: threaded or flanged mounting, supports top, side, or inclined installation.
- Low maintenance cost: modular structure, paddle and motor are easy to replace.
Key Technical Parameters
The following are typical parameters of the FTE30 rotary paddle level switch. The specific product nameplate and manual shall prevail.
| Parameter Item | Typical Value/Range |
|---|---|
| Power Supply Voltage | 220V AC / 24V DC (optional) |
| Output Signal | SPDT micro switch, contact capacity 250V AC 5A |
| Paddle Speed | Approx. 1 r/min |
| Operating Temperature | -20℃ ~ +80℃ (high-temperature type up to +200℃) |
| Operating Pressure | Atmospheric pressure or ≤0.6MPa |
| Protection Rating | IP65 (optional IP67) |
| Mounting Method | G1" thread, flange, or bracket |
| Paddle Material | Stainless steel 304/316L |
Installation and Commissioning Steps
Installation Points
- Confirm that the silo opening size matches the mounting method to avoid interference between the paddle and the silo wall.
- For top installation, the paddle should extend into the silo to avoid material impacting the paddle.
- For side installation, it is recommended to tilt downward 15°~20° to prevent material from accumulating on the paddle.
- The wiring compartment must be sealed to prevent dust or moisture from entering.
Commissioning Steps
- With the power off, check whether the paddle can rotate freely without jamming.
- Connect the power supply and output signal wires according to the wiring diagram in the manual.
- After power-on, observe whether the paddle rotates normally and whether the output status is correct.
- Manually block the paddle to confirm that the switch signal operates, and check the interlock logic.
- Restore the material and confirm that the paddle automatically resets and the signal is cleared.
Selection and Maintenance Recommendations
Selection Points
- Select paddle shape and material according to material characteristics: choose a large paddle for sticky materials, and 316L for corrosive materials.
- For high-temperature conditions, choose the high-temperature type and confirm the process connection and sealing material.
- For explosion-proof occasions, an explosion-proof rotary paddle level switch must be selected.
- Confirm the power supply voltage and output contact capacity to match the PLC or alarm.
Maintenance Recommendations
- Regularly check whether the paddle is deformed, loose, or has material buildup, and clean it in time.
- Check every six months whether the wiring terminals are loose and whether the sealing ring is aged.
- If the motor does not rotate, first check the power supply and capacitor, then check whether the clutch is worn.
- When replacing the paddle or motor, tighten according to the torque requirements in the manual.
Common Problems and Solutions
| Fault Phenomenon | Possible Cause | Handling Method |
|---|---|---|
| Paddle does not rotate | Power failure, capacitor damage, motor seized | Check power supply and capacitor, remove foreign objects, replace motor |
| No signal when material is present | Micro switch damaged, clutch slipping | Replace micro switch, adjust clutch |
| Signal does not reset | Paddle stuck by material, spring failed | Clean paddle, replace spring |
| Paddle frequently malfunctions | Improper installation position, material impact | Adjust installation angle, add protective baffle |
Conclusion
With its features of simple structure, strong anti-interference, and convenient maintenance, the FTE30 rotary paddle level switch has become a classic solution for solid level detection. Correct selection, standardized installation, and regular maintenance are the keys to ensuring long-term stable operation. For the complete wiring diagram, dimensional drawing, and certification information, please download the FTE30 Chinese manual above.