FTE20 Rotary Paddle Level Switch Explosion-Proof Operation Manual (Chinese)

1. Overview of FTE20 Rotary Paddle Level Switch

The FTE20 rotary paddle level switch is an explosion-proof level switch used for level detection of solid particles or powders. It drives a paddle to rotate via a micro motor. When the paddle contacts material and is obstructed, the mechanism displaces and triggers a micro switch, outputting a switching signal. This product is widely used for high/low level alarm or control in silos in industries such as chemicals, grain, cement, and metallurgy.

Download the FTE20 Rotary Paddle Level Switch Explosion-Proof Operation Manual (Chinese).pdf

2. Main Technical Parameters of FTE20

3. FTE20 Installation Steps

3.1 Pre-installation inspection

• Confirm that there is no pressure and no hazardous material residue inside the silo.
• Check whether the paddle is deformed and whether it rotates flexibly.
• Verify that the explosion-proof rating matches the on-site hazardous area.

3.2 Installation position selection

• Avoid installing directly below the feed inlet to prevent material from directly impacting the paddle.
• For horizontal installation, the paddle should extend into the silo to ensure reliable contact with the material.
• For high-level detection, it is recommended to install at the top of the silo; for low-level detection, install on the lower part of the side wall.

3.3 Mechanical installation

1. Align and tighten the process connection thread or flange with the silo interface.
2. Use a wrench to tighten to ensure reliable sealing and prevent dust leakage.
3. Adjust the paddle direction so that its rotation plane is perpendicular to the material flow direction.

4. FTE20 Electrical Wiring and Commissioning

4.1 Wiring method

• Open the explosion-proof junction box and connect the power and output signal wires according to the terminal markings.
• It is recommended to use shielded cable for the power line, with the shield grounded at one end in the safe area.
• After wiring is completed, tighten the junction box cover to ensure the flameproof surface is clean and undamaged.

4.2 Commissioning steps

1. After power-on, observe whether the paddle rotates normally.
2. Gently press the paddle by hand to simulate material blocking and confirm that the output relay operates.
3. Adjust the sensitivity spring (if any) so that the operating torque meets the on-site material density requirements.
4. After confirming everything is correct, tighten the adjusting nut and restore the explosion-proof enclosure.

5. Explosion-Proof Operating Precautions

• It is strictly prohibited to open the cover while energized in a hazardous area; operation must be performed after power-off.
• Regularly inspect the flameproof surface for scratches or corrosion, and apply anti-rust grease.
• When replacing parts, original factory explosion-proof certified accessories must be used.
• The cable entry device must use a sealing joint that meets explosion-proof requirements.

6. Common Faults and Troubleshooting

7. Maintenance and Care

It is recommended to perform a regular inspection every 6 months, including paddle wear, terminal tightening, and flameproof surface condition. In dusty environments, the inspection interval should be shortened. Before restarting after long-term shutdown, fully check insulation resistance and operation reliability.

For the complete FTE20 Rotary Paddle Level Switch Explosion-Proof Operation Manual (Chinese), please click the PDF file above to download.