Cement | flour | bulk material rotary | rotating motion level sensor | detector | 230VAC | 5A/250V SPDT | with protective shaft tube | IP65

The main difference between this model and the standard version is the extended sensor section with a Φ28mm protective tube. The tube covers most of the shaft, leaving only the lower shaft section and paddle exposed. This construction helps reduce direct contact between the bulk material and the shaft and is suitable for installations where a longer sensor section is required.

The Φ28mm protective tube covers the extended shaft section and reduces its direct contact with the bulk material. This is particularly useful when the switch is installed deeper inside the tank or in locations where a long unprotected shaft would be more exposed to material weight, movement or lateral mechanical loads.

The integrated microswitch has an SPDT changeover contact with an electrical rating of up to 5A / 250VAC. The contact signal can be transmitted to a PLC, interposing relay, contactor, visual or audible alarm and other compatible control equipment.

Although most of the shaft is protected by the Φ28mm tube, the lower section and the paddle remain moving parts. Sufficient clearance must be provided around the paddle at the installation point, and it must not touch the tank walls, supports, pipes or other internal structures.

The rotary paddle level switch with protective shaft tube can be used in production, storage and processing systems where it is necessary to detect whether bulk material has reached a specific level. The extended design is particularly useful where the paddle needs to extend deeper into a hopper, silo or other process vessel.

• Φ28mm protective shaft tube covers and protects the main section of the extended shaft.
• 250mm sensor section allows the paddle to extend deeper into the monitored vessel.
• Simple electromechanical operating principle is designed for point level detection of bulk materials.
• SPDT 5A / 250VAC contact allows the signal to be transmitted to a control or alarm system.
• SUS304 stainless steel paddle is designed for direct contact with bulk material.
• 1 rpm rotation speed is intended for mechanical detection of material presence.
• IP65 protection rating protects the housing against dust and water jets.
• M20x1.5 cable entry is intended for electrical connection.
• -20°C to +80°C operating temperature is suitable for typical industrial conditions.
• 3W power consumption is required to drive the paddle.

• Designed for point level rather than continuous level measurement: the switch detects material at one specific point but does not measure the overall fill level.
• The paddle must contact the material: the operating principle is based on physically stopping the paddle.
• Not suitable for liquid level measurement: the construction is designed for bulk materials.
• Standard temperature version: processes above +80°C require a model designed for high-temperature operation.
• Standard pressure version: pressure vessels require a separate high-pressure version.
• The longer construction requires more space: the 250mm sensor section length must be taken into account before installation.
• The protective tube does not protect the paddle itself: the lower moving section must still be protected from strong direct impact from falling material.

In a grain hopper, the point level switch must be installed so that the paddle is positioned farther away from the hopper wall and reaches the internal material zone. For this purpose, a version with an extended 250mm sensor section and a Φ28mm protective shaft tube is used. As long as the grain does not reach the paddle, the 230VAC motor rotates it at approximately 1 rpm. When the grain rises to the paddle, it stops rotating, the SPDT contact switches, and the signal is transmitted to the controller, which can stop material feeding or activate a full-tank alarm.

The main difference is the extended sensor construction with a Φ28mm protective tube covering the main section of the shaft. According to the drawing, the sensor section length from the mounting plane is approximately 250mm.

It covers the extended shaft section and helps reduce direct contact with the bulk material as well as lateral mechanical loads on the shaft.

According to the dimensional drawing, the outside diameter of the protective tube is Φ28mm.

The shaft diameter is Φ10mm.

It detects whether bulk material has reached a specific point in the tank. It is a point level switch rather than a continuous level measuring device.

The paddle rotates slowly. When the bulk material reaches it and creates mechanical resistance, rotation stops and the internal mechanism switches the SPDT contact.

The switch supply voltage is 230VAC.

An SPDT microswitch contact is used, with an electrical rating of up to 5A / 250VAC.

The paddle rotation speed is approximately 1 rpm.

The paddle is made of SUS304 stainless steel.

The operating temperature range of the standard version is -20°C to +80°C.

This is a standard-pressure version intended for normal atmospheric-pressure processes.

The electrical cable entry is M20x1.5.

The enclosure protection rating is IP65.

Yes. When installed in the upper part of the tank, the SPDT contact can be used to stop material feeding or activate a full-tank alarm.

Yes. When correctly installed in the lower or side section of the tank, the change in contact state can be used to monitor the minimum material level.

The rotary paddle level switch with protective shaft tube must be installed so that the lower moving paddle can rotate freely and does not touch the tank wall or internal structures. The Φ28mm protective tube reduces mechanical load on the shaft, but the paddle must remain in a clear process area and should not be continuously exposed to a strong stream of directly falling material. Electrical 230VAC connection work must be carried out by a qualified specialist with the power supply disconnected before work begins. The SPDT contact rating of 5A / 250VAC must not be exceeded. For high-temperature, high-pressure or explosive-environment processes, a switch version specifically designed for those conditions must be used.