Rotary Paddle Level Switch

The Rotary Paddle Level Switch is used for point level detection in bulk solids like powders, granules, and pellets through rotating a paddle in the material by means of a low speed motor.

Once the material contacts the paddle, it gets restrained and the motor comes to a halt thereby triggering the built-in SPDT microswitch for level sensing.

This switch can be installed in hoppers, bins, and silos and can be installed as a top mount for high level detection.

For environments where there is the risk of explosion due to flammable dust, the switches are available with flameproof enclosures.

• Pump control according to material level.
• Suitable for alarm and shutdown duties.
• Ideal for sump level control.
• Supports fuel dispensing system applications.
• Provides empty conveyor alarm.
• Suitable for differential level control.
• Can be used for wellhead automation.
• Ideal for storage tank level monitoring.
• Suitable for hydraulic and lubricating oil reservoirs.
• Provides spark protection in diesel fuel distribution.

• Application: Powders, Granules & Bulk Solid Materials
• Specific Gravity of Material: Above 0.5 g/cm³
• Operating Temperature: -10°C to 80°C
• Power Consumption: 3 W

Free Paddle Rotation

The free rotation of the low-speed synchronous motor fitted in the tank causes the continuous rotation of the stainless steel paddle in the tank if the storage vessel is empty or the material level is below the detection point.

Material Detection

With the rising level of powder, granules, or other bulk materials, the material level reaches the paddle and obstructs its free rotation.

Motor Stalling

After being fully covered with the material, the increased resistance makes the motor stall. The motor is designed in such a way that it can stall without any harm.

Switch Actuation

The stall in the motor actuates an internal switch of the motor to change the electrical contact state showing that the material level reaches the preset point.

Control Output

This output signal can be used to control alarms, conveyor belts, or other process equipment to prevent overflow or to maintain the material level.

Mechanical Construction & Materials

• Paddle Material: High-grade SS304 stainless steel construction.
• Paddle Size Dimensions: Standard 40 mm x 100 mm blade configuration.
• Internal Drive Mechanism: Internal assembly utilizing a specialized 1 RPM synchronous motor.

Power Supply & Electrical Interfacing

• Standard Operating Supply: 220 VAC configuration.
• Optional Operational Supply Voltages: 110 VAC, 24 VAC, or 24 VDC inputs.
• Power Consumption Load: Maximum 3 W energy draw.
• Electrical Housing Glands: M20 x 1.5 connection interface.

Signal Outputs & Contacts

• Contact Circuit Type: Double Pole Double Throw (DPDT) contact configuration.
• Contact Load Rating Capacity: 220 VAC, 5 A potential-free output switching limits.

Process Boundaries & Mounting

• Process Interfacing Ports: Standard 1” NPT Male threaded entry (with optional custom Flange connections).
• Medium Thermal Operating Boundaries: -10°C to 80°C functional range.
• Material Density Threshold: Suitable for dry bulk solids, powders, or media possessing a specific gravity greater than 0.5 g/cm³.

Effective Material Level Detection: The Rotary Paddle Level Switch provides continuous material level detection and operates upon material coverage of the paddle, thus helping avoid overfilling.

Robust Mechanism: A low-speed synchronous motor is intended to stall in case the material obstructs the paddle movement, hence providing durability.

Safety Standards: The switch can be supplied with a flame-proof housing for use in potentially explosive environments, including those with combustible dust.

Installation Convenience: Top mount and side mount versions are offered for installation into bins, hoppers, and silos for efficient point level detection.