charge weigher Interview Questions and Answers

1. What is a charge weigher and how does it work?

   • Answer: A charge weigher is a device used in industrial processes to accurately measure the weight of a batch of material before it's transferred to the next stage of production. It typically involves a hopper or container placed on a load cell, which measures the weight and transmits the data to a control system. This system then manages the filling process to achieve the desired target weight.

2. Describe your experience with different types of charge weighers.

   • Answer: (This answer will vary depending on the candidate's experience. A strong answer will mention specific types like belt weighers, hopper weighers, and their applications. It should also include details on different weighing technologies like load cells, strain gauges, etc.) For example: "I've worked extensively with hopper weighers in the food processing industry, specifically those using strain gauge load cells for high accuracy. I've also had experience troubleshooting belt weighers used in aggregate handling, where maintaining calibration in harsh conditions was critical."

3. Explain the importance of calibration in charge weigher operation.

   • Answer: Calibration is crucial for ensuring the accuracy of the charge weigher. Inaccurate weighing can lead to production inefficiencies (underfilling or overfilling), waste of materials, and potentially safety hazards. Regular calibration using certified weights ensures the weigher consistently provides reliable measurements within acceptable tolerances.

4. How do you troubleshoot a charge weigher that's providing inaccurate readings?

   • Answer: My troubleshooting approach involves a systematic process: First, I'd check the calibration. Then, I'd inspect the load cells for damage or misalignment. I'd examine the electrical connections and wiring for faults. I'd also verify the control system's software and settings. Finally, I'd consider environmental factors such as temperature fluctuations or vibrations that might affect accuracy.

5. What safety precautions do you take when working with a charge weigher?

   • Answer: Safety is paramount. I always follow lockout/tagout procedures before any maintenance or repair. I wear appropriate personal protective equipment (PPE), including safety glasses and gloves. I'm careful to avoid any potential pinch points or crushing hazards around moving parts. I'm also aware of the potential for electrical hazards and follow all relevant safety regulations.

6. How familiar are you with different types of load cells?

   • Answer: (This answer should detail knowledge of various load cell types like strain gauge, piezoelectric, hydraulic, and their respective pros and cons. Mention specific applications where certain types are preferred.) For example: "I'm familiar with strain gauge load cells, which are commonly used for their high accuracy and relatively low cost. I also have some experience with piezoelectric load cells, which are better suited for dynamic weighing applications."

7. Explain your experience with PLC programming related to charge weighers.

   • Answer: (This answer should demonstrate knowledge of PLC programming, including ladder logic or other programming languages used to interface with weighers. Mention specific PLCs used and examples of programs written.) For example: "I have experience programming Allen-Bradley PLCs to control and monitor charge weighers. I've written programs to manage the filling process, record weight data, and trigger alarms for weight deviations."

8. How do you handle discrepancies between the charge weigher reading and the expected weight?

   • Answer: I'd investigate the source of the discrepancy systematically. I'd check the calibration, look for any physical issues with the weigher, examine the material flow for blockages, and review the settings in the control system. I'd document all findings and take corrective actions based on the root cause.

9. Describe your experience with data acquisition and reporting from a charge weigher.

   • Answer: (This should cover experience with various data acquisition methods, software used, report generation, and data analysis.) For example: "I've used various software packages to acquire data from charge weighers, including SCADA systems and dedicated weighing software. I can generate reports on weight trends, identify deviations, and analyze data to optimize the weighing process."

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