Principle and common troubleshooting of rotary level switch

The rotary paddle level switch is a very common material level measuring instrument, which is widely used in the production process and storage department of petrochemical, light industry, environmental protection, metallurgy, building materials, chemical industry, food and other industries. This is inseparable from its strong adaptability, no need for adjustment, and maintenance-free. Despite this, some front-line operators do not understand the principle of the rotary paddle level switch and do not know how to deal with common faults during use. Therefore, this article introduces the principle of the rotary paddle level switch and the handling of common faults.

Standard Rotary Paddle Level Switch

1. The principle of rotary paddle level switch

　　The controller of the rotary paddle level switch adopts the principle of electromechanical potential control. When there is no material in the blade part of the silo, the rotary paddle level switch is energized, the indicator light is on, and the blade rotates counterclockwise; when there is material in the blade part of the silo, the rotation of the blade is blocked, the control signal is converted, and the power supply of the motor of the rotary paddle level switch is disconnected until there is no material in the blade part. The rotary paddle level switch automatically resets. At this time, the motor power is connected, the indicator light is on, the blade starts to rotate, the control signal is switched, and this cycle repeats.

　　The paddle-rotor level switch uses a micro motor as a driving device, which is connected to the drive shaft through a clutch. When the blade does not contact the material, the motor operates normally. When the blade contacts the material, the motor stops rotating and automatically cuts off the motor power supply. At the same time, the detection device outputs a contact signal to control material transportation.

2. Common troubleshooting of rotary level switch

　　During the use of the rotary paddle level switch, motor jamming is a common fault, which is mainly manifested in the signal staying in the alarm or non-alarm state for too long, the signal changing abnormally, and being intermittent.

　　Most of the causes of motor jamming are due to lack of lubrication. Due to insufficient lubrication, when the motor drives the rotating blades to run, the resistance is too large, causing the motor to stop or run intermittently.

　　To eliminate this fault, you can remove the instrument and the sealing ring at the seal, wipe off the impurities in the sealing ring, and lubricate it. Then, through trial operation, observe whether the instrument still has stuck and intermittent operation. If it rotates normally, it means that the fault of the instrument has been eliminated.

　　To ensure the safety of themselves and others, instrument operators must standardize operations, comply with all warnings, and correctly use the rotary paddle level switch products and connecting devices during operation.