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The 21505-00-28-05-02 is an 8mm Standard Mount Proximity Probe, commonly used for industrial vibration monitoring. It is a 21505 series probe designed for radial vibration and position measurements on rotating machines.
Both dynamic and static considerations
Adaptability to harsh environments
Compliant with API 670 industry standard
The Bently Nevada 7200 series 5mm and 8mm probes are non-contact systems based on the eddy current principle, used to measure shaft displacement and vibration in rotating machinery. The system conforms to API 670 standards, provides a linear range of approximately 80 mils, and has a sensitivity of 200 mV/mil. It consists of a probe, extension cable, and preamplifier.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Bently Nevada 21505-00-28-05-02 8mm Standard Mount Proximity Probe Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Oil & Gas Industry
Installed on centrifugal compressors or large oil transport pumps to monitor the radial vibration of high-speed rotating shafts, preventing severe vibration or equipment shutdown caused by rotor unbalance or misalignment.
Power Generation Industry
Installed near the thrust bearings of steam turbines or hydro-generators to precisely measure axial thrust position/axial displacement, preventing catastrophic friction between the blades and the casing due to thrust pad wear.
Steel and Metal Industry
Used for bearing monitoring on large blast furnace blowers or rolling mill drive motors, providing shaft centerline/attitude angle analysis to evaluate oil film stability and alignment of journal bearings under heavy loads.
Mining and Minerals Industry
Used on heavy-duty crushers or the bearing housings of main ventilation fans for machinery protection, triggering automatic safety interlocking shutdowns via 3300/3500 systems when vibration exceeds safe limits.
Pulp and Paper Industry
Used on the large drying cylinder bearings of paper machines or high-speed refiners to monitor dynamic oil film thickness, preventing bearing burnout in heavy-load, hot, and humid environments.
When using the 21505 eddy current probe, it is crucial to prevent mechanical damage. Avoid impacting the shaft surface with the probe head during installation or rotation. During installation, ensure a precise initial gap by monitoring the output voltage (usually adjusted to around -10V). Simultaneously, ensure the tested shaft surface is smooth to eliminate spurious vibration signals. Do not cut the cable yourself to maintain impedance matching of the system. Finally, ensure proper insulation and moisture-proof sealing of the coaxial connector to prevent oil seepage that could cause data drift.
The 21505-00-28-05-02 is a 7200 series 8 mm Eddy Current Proximity Probe manufactured by Bently Nevada.
How to use products like the 21505-00-28-05-02?
To use it, it needs to be installed on a bearing housing or a dedicated probe bracket. The probe tip must face the metal surface of the rotating shaft and maintain a specific initial gap (achieved by adjusting the thread depth). It cannot work alone and must be connected to a Proximitor via an extension cable.
What is the primary function of the 21505-00-28-05-02 in the system?
Its primary function is acting as an "industrial sensor," detecting real-time minute changes in the distance between the rotating shaft surface and the probe tip to capture high-precision dynamic vibration signals (like radial vibration) or static position signals (like axial displacement).
What is the working principle of the 21505-00-28-05-02?
It is based on the Eddy Current principle.
What should be paid attention to in the daily maintenance of the 21505-00-28-05-02?
The maintenance focus is on protecting the cable and connector. Never bend the cable sharply (the bend radius must exceed 25.4 mm), and ensure its miniature coaxial connector never gets contaminated with oil or moisture. The connector must be sealed with self-fusing electrical tape or a dedicated connector protector.
Will a failure of the 21505-00-28-05-02 cause a machine shutdown?
This depends on the logic configuration of the monitoring system.
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