Technical Specifications

FAQ

1. What is the main application of the 21505-00-28-05-02 8 mm armored probe?

This probe is designed for continuous monitoring of rotating machinery in industrial environments. It is commonly installed on equipment such as steam turbines, gas turbines, centrifugal compressors, pumps, fans, and gearboxes. Its main purpose is to measure shaft vibration and axial displacement in real time. By continuously tracking shaft movement, it provides critical data for condition monitoring systems, enabling operators to detect early signs of mechanical wear, misalignment, imbalance, or bearing degradation before these issues lead to serious equipment failure or unplanned shutdowns.

2. How does this probe measure vibration and displacement?

The probe operates using eddy current technology, which is a non-contact measurement method. A high-frequency electromagnetic field is generated at the probe tip. When this field interacts with a conductive rotating shaft, eddy currents are induced on the shaft surface. As the distance between the probe and the shaft changes due to vibration or axial movement, the strength of the eddy current response changes accordingly. This variation is converted into an electrical signal that represents precise shaft position and movement. Because there is no physical contact with the shaft, the measurement is highly accurate and suitable for high-speed rotating machinery.

3. Is the probe suitable for harsh industrial environments?

Yes, this probe is specifically engineered for harsh and demanding industrial conditions. Its armored cable construction provides strong protection against mechanical damage, abrasion, oil exposure, and environmental contaminants. In addition, the probe is designed with strong electromagnetic interference resistance, making it suitable for installation in environments with heavy electrical equipment and high levels of electrical noise. It is widely used in power plants, petrochemical facilities, and heavy industrial plants where equipment reliability and measurement stability are critical.

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

In a machinery protection system, the probe acts as a primary sensing element responsible for continuously monitoring shaft dynamics. It provides real-time data on vibration levels and axial displacement, which are key indicators of machine health. The monitoring system analyzes these signals to detect abnormal conditions such as rotor imbalance, shaft misalignment, bearing wear, and mechanical looseness. If vibration levels exceed predefined thresholds, the system can trigger alarms or even automatic shutdowns to protect equipment from severe damage, making the probe an essential component of predictive maintenance strategies.

5. How is measurement accuracy maintained during operation?

Maintaining measurement accuracy requires proper installation, calibration, and environmental control. The probe must be installed with a precisely controlled gap relative to the shaft surface, as incorrect spacing can lead to signal distortion or inaccurate readings. The mounting structure must remain rigid and free from vibration-induced movement. During operation, the measurement area should be kept clean and free from oil, dust, or debris that could interfere with the electromagnetic field. Proper system calibration during commissioning ensures that the electrical signal output accurately corresponds to actual mechanical displacement.

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

Yes, the probe is designed for continuous online monitoring and is capable of 24/7 operation in industrial environments. It is built using industrial-grade materials and a robust armored structure that ensures long-term durability under constant mechanical and environmental stress. This makes it suitable for critical applications where uninterrupted monitoring is required. When properly installed and maintained, it can deliver stable and reliable performance over extended operational periods without degradation in measurement quality.

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

Proper installation is essential for reliable operation. The probe must be positioned at an optimal distance from the rotating shaft to ensure it operates within its linear measurement range. The mounting system should be rigid and resistant to vibration to prevent any positional drift over time. Cable routing should avoid proximity to high-voltage power lines or strong electromagnetic sources to minimize signal interference. Proper grounding practices should also be followed to maintain signal integrity. During commissioning, calibration is required to align the probe output with actual shaft movement.

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

Yes, this probe is fully compatible with Bently Nevada 7200 series monitoring systems. It is designed to work seamlessly with matching proximitor modules and monitoring units as part of a complete machinery protection and condition monitoring solution. When integrated into the system, it provides accurate real-time vibration and displacement data, enabling advanced condition monitoring, trend analysis, alarm management, and automated protection functions. It is widely used in critical industrial assets where reliability, safety, and predictive maintenance capabilities are essential.