How to Troubleshoot a Speed Sensor on a Decanter Centrifuge

Speed sensor issues in decanter centrifuges can lead to inaccurate readings and disrupt optimal operation. Fortunately, several troubleshooting steps can help operators diagnose and resolve sensor-related problems before they cause significant downtime. 

The above video explains the importance of maintaining accurate speed readouts and how erratic readings may indicate an issue that needs immediate attention. It also outlines key diagnostic techniques that may affect sensor performance.

Understanding the Role of a Speed Sensor in a Decanter Centrifuge

A speed sensor is a crucial component of a decanter centrifuge. It reads the speed of both the bowl and scroll. Maintaining accurate speed readouts ensures the centrifuge's optimal operation.

If your speed sensor provides erratic readings, it indicates a potential issue that requires immediate attention. Ignoring these irregularities can lead to inefficient operation, unnecessary downtime or even damage to the centrifuge.

Steps to Troubleshoot a Speed Sensor Problem

If you notice abnormal speed readouts, follow these troubleshooting steps to diagnose and resolve the issue efficiently:

 1. Check the Power Supply

The speed sensor typically operates on a 24V DC power supply. Verify the voltage between the brown and blue wires to confirm the sensor receives adequate power.

2. Inspect the Target Distance

The distance between the sensor and its target should be within the optimal range—usually between 30 and 40 thousandths of an inch. A feeler gauge can accurately measure this distance, but a credit card can be a rough substitute in a pinch.

3. Verify the Sensor's Signal Detection

Most speed sensors have an LED indicator that lights up when a signal is detected. The proximity sensor must align with the steel target on the counting range. Further investigation is needed if everything is correctly positioned but the LED does not illuminate.

4. Ensure Stability and Eliminate Vibration

Excessive vibration or unintended movement can disrupt the sensor's ability to detect speed accurately. Ensure the sensor and its mounting components are secure and free from excessive movement.

5. Replace the Speed Sensor if Necessary

If you have verified that the power supply, target distance and stability are correct, yet the sensor still does not detect a signal, it is likely damaged and will need to be replaced. Centrisys offers replacement speed sensors for this situation.

Importance of Regular Maintenance

Routine maintenance of your decanter centrifuge, including periodic sensor checks, is essential for preventing unexpected failures and extending the equipment's lifespan. Regular monitoring and proactive maintenance help avoid speed sensor failures by allowing operators to recognize early warning signs, use proper diagnostic tools, and ensure correct sensor alignment and power supply—ultimately preventing inaccurate readings and costly downtime.

Centrisys offers comprehensive decanter centrifuge maintenance, service, and repairs for all brands. Whether you need routine calibration or a complete sensor replacement, our team is here to help.  Learn more.  

Speed Sensor Troubleshooting FAQs:

• What are the common symptoms of a failing speed sensor?
  
  
  • A failing speed sensor may present several warning signs, including:
    • Erratic or fluctuating speed readings, which may cause operational inconsistencies.
    • A complete loss of speed readout, making it difficult to monitor centrifuge performance.
    • The LED indicator fails to light up when expected, suggesting a sensor malfunction. 

• Can I use any speed sensor replacement, or should I use a Centrisys-approved part?
   
  • Centrisys-approved speed sensors are strongly recommended when replacement is needed. While other sensors may physically fit, they may not meet the necessary performance and reliability standards. Using a non-approved part can lead to inaccurate speed readouts, increased downtime, and potential damage to the centrifuge.

• How often should I inspect my speed sensor?
   
  • Speed sensors should be checked regularly as part of your routine maintenance program. Depending on the operating conditions and workload of the centrifuge, a general recommendation is to inspect them every three to six months. Frequent inspections can help catch potential issues early and prevent costly repairs.

• What other components should I inspect if my centrifuge isn’t running correctly?
   
  • If you are experiencing operational issues beyond speed sensor readings, consider inspecting:
    • The power supply –  to ensure proper voltage and connectivity.
    • Bearings and lubrication systems – improper lubrication can cause excess wear and vibrations.
    • The control panel settings –  confirm proper configuration and function.
    • Wiring and connections –  signs of damage or corrosion may be visible.

• Where can I get help if I need further assistance?
   
  • For expert guidance, service or maintenance, visit the Centrisys/CNP service page for more information. Our experienced technicians can assist with troubleshooting, repairs and maintenance for all brands of decanter centrifuges.