Technical Specifications

FAQ

1. What is the main application of the 21505-04-12-90-02 armored probe?

This probe is designed for continuous monitoring of rotating machinery in industrial environments. It is typically used on critical equipment such as steam turbines, gas turbines, compressors, pumps, fans, and gearboxes. Its main function is to measure shaft vibration and axial displacement in real time. These measurements are essential for evaluating machine condition, identifying early-stage mechanical faults, and supporting predictive maintenance strategies that help prevent unexpected failures and unplanned downtime in industrial operations.

2. How does the eddy current measurement principle work in this probe?

The probe uses the eddy current non-contact measurement principle. A high-frequency electromagnetic field is generated at the probe tip, which induces eddy currents on the surface of a conductive rotating shaft. As the distance between the probe and the shaft changes due to vibration or axial movement, the eddy current intensity also changes. This variation is converted into an electrical signal proportional to displacement. Because the measurement is non-contact, it provides high accuracy and stability, especially in high-speed rotating machinery applications.

3. Is this probe suitable for harsh industrial environments?

Yes, it is specifically designed for harsh industrial conditions. The armored cable construction provides strong protection against mechanical stress, abrasion, oil exposure, and accidental damage during installation or operation. It also offers excellent resistance to electromagnetic interference, which is common in heavy industrial environments. This makes it suitable for use in power plants, petrochemical facilities, and large-scale manufacturing plants where reliability and durability are critical requirements.

4. What role does this probe play in a machinery protection system?

In a machinery protection system, the probe serves as a primary sensing element responsible for continuously monitoring shaft behavior. It provides real-time vibration and displacement data that is used by monitoring systems to assess machine health. If abnormal conditions such as excessive vibration, shaft misalignment, or instability are detected, the system can trigger alarms or initiate automatic shutdown actions. This helps prevent severe equipment damage and ensures safe operation of critical rotating machinery.

5. How can measurement accuracy and reliability be ensured?

Accuracy depends on proper installation and stable operating conditions. The probe must be installed with a precisely controlled gap relative to the shaft surface to ensure operation within its linear measurement range. The mounting structure must be rigid to prevent vibration-induced movement or drift. The measurement area should be kept clean and free from oil, dust, or debris that could interfere with the electromagnetic field. Proper calibration during commissioning is also essential to ensure accurate signal conversion.

6. Can this probe operate continuously in 24/7 monitoring systems?

Yes, this probe is designed for continuous online monitoring and is suitable for 24/7 operation in industrial environments. It is built using industrial-grade materials and a robust armored structure that ensures long-term stability under continuous mechanical and environmental stress. It is commonly deployed in mission-critical applications where uninterrupted monitoring is required to maintain safe and reliable operation of rotating machinery.

7. What are the key installation requirements for this probe?

Correct installation is essential for reliable performance. The probe must be positioned at the proper distance from the rotating shaft to ensure it operates within its specified measurement range. The mounting system must be rigid and resistant to vibration to avoid positional drift. Cable routing should avoid proximity to high-voltage power lines or strong electromagnetic sources to minimize interference. Proper grounding practices should also be followed, and system calibration must be completed during commissioning to ensure accurate measurement output.

8. Is this probe compatible with Bently Nevada 7200 series systems?

Yes, it is fully compatible with Bently Nevada 7200 series monitoring systems. It is designed to work together with matching proximitor modules and monitoring units as part of a complete machinery protection and condition monitoring solution. Once integrated, it enables real-time vibration monitoring, trend analysis, alarm management, and predictive maintenance functions, making it widely used in critical industrial assets where reliability and operational safety are essential.