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GREAT SYSTEM INDUSTRY CO. LTD กรณีบริษัทล่าสุดเกี่ยวกับ Classic Questions on Bently Nevada Condition Monitoring and Protection
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Classic Questions on Bently Nevada Condition Monitoring and Protection

2026-04-09

กรณีบริษัทล่าสุดเกี่ยวกับ Classic Questions on Bently Nevada Condition Monitoring and Protection
1. Can a 5‑meter eddy current probe be directly used with a 5‑meter proximitor without an extension cable?

Answer: Yes, as long as probe length + extension cable length = proximitor length. Extension cables are only used for easier installation and commissioning.

Example: 1‑meter probe + 4‑meter extension cable = 5‑meter proximitor.

2. What determines the probe sensitivity of 7.87 V/mm?

Answer: It mainly depends on the probe material, which is AISI 4140 steel. If the material changes, the sensitivity changes accordingly.

3. How does the surface area of the shaft affect vibration measurement?

Answer:

  • Larger probe diameter → longer measuring distance → lower sensitivity → poorer linearity.
  • Smaller probe diameter → shorter measuring distance → higher sensitivity → better linearity.
4. Which parameters of the proximitor and probe are fixed?

Answer:

  • Fixed frequency (RF signal) of the proximitor.
  • Fixed capacitance, inductance, and resistance of the coaxial cable and probe.

This ensures the gap voltage between the probe and the shaft is proportional to the distance.

5. Why does bending a coaxial cable at a right angle cause bad readings, which return to normal when straightened?

Answer: Bending the cable at a right angle changes the capacitance of the insulation layer between the inner shield and the center conductor. Straightening restores the original capacitance.

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6. How should the probe‑to‑coaxial cable connection be secured?

Answer: Rotate gently by hand until 3–4 clicks are heard. Overtightening is not recommended. There is a spring inside; excessive compression may damage its elastic deformation.

7. Can resistance testing of the extension cable and probe determine whether the probe is good?

Answer:

  • Resistance within the specified range does not guarantee the probe is functional.
  • Resistance out of range, short circuit, or open circuit means the probe is definitely unusable.

It is best to measure resistance with the coaxial cable connected.

8. How does coaxial cable length affect measurement sensitivity?

Answer:

  • Cable length matches proximitor → accurate sensitivity.
  • Cable too short → higher measured sensitivity.
  • Cable too long → lower measured sensitivity.
9. A calibrated vibration probe is installed at −10 V when stopped, but shows no vibration change during operation. What is the cause and solution?

Answer: The probe installation is limited by lateral interference and reaches −10 V prematurely before reaching the correct position.

Correct installation: Slowly lower the probe until reaching −5 V, then back off slowly to −10 V.

10. Does installing a vibration probe at −8 V or −12 V affect measurement? Can displacement probes be installed at −8 V or −12 V?

Answer:

  • For vibration measurement, installation at −8 V or −12 V does not affect normal operation.
  • For displacement measurement, the probe must be installed near −10 V.


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