21504-32-56-10-02 Bently Nevada Proximity Probe
Description
The 21504 “base number” refers to Bently Nevada’s 7200‑series standard‑mount proximity (eddy‑current) probes (typically 5 mm or 8 mm diameter).These probes provide non‑contact measurement of shaft or target
displacement / gap, meaning they sense the distance between the probe tip and a conductive target (e.g. a shaft), and convert that gap into an electrical signal (voltage) that can be read by a compatiblesignal
conditioner or monitor.The probe housing is typically stainless steel (robust for industrial conditions) and the unit uses a shielded coaxial cable + coaxial connector for signal transfer, ensuring reliable,
interference-resistant output.In short — the 21504‑ series probe is a core sensor for non‑contact shaft monitoring, converting physical
gap/displacement (static or dynamic) into a usable electrical signal (gap voltage) for monitoring systems.
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FAQ
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What kind of systems / machinery is this suitable for?
Typical applications include rotating machinery such as turbines, compressors, pumps, motors, generators, fans, centrifuges — especially in heavy industries, power plants, petrochemical plants, etc. The 7200‑series probes are part of widely used systems for industrial shaft monitoring and condition monitoring.
They’re also suitable where a non‑contact, robust, industrial‑grade proximity measurement is required (shaft clearance, vibration, displacement) in harsh, possibly oily/chemically aggressive environments.
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What do I need to use the probe properly?
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Use it as part of a complete proximitor / monitoring system (probe + cable + signal conditioner / monitor / Proximitor module). The probe alone only changes gap into raw eddy‑current signal; you need the matching electronics for linearization, output, and monitoring. This is especially important for systems adhering to standard protocols (e.g. for protection or alarm applications).
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Install with correct mounting (3/8‑24 UNF standard mount), correct probe-to-shaft gap (within linear range), good cable routing (shielded, strain‑relieved), and proper sealing/connector usage if in harsh environment.
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Ensure environmental conditions (temperature, fluids, contamination) are within the probe’s tolerances as per datasheet of your specific unit / configuration.
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What are limitations / what to check carefully?
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Because the “56” in the part number is unusual in public 21504 listings, it’s possible this is a non‑standard / custom variant — meaning mechanical dimensions or internal construction may differ from typical 21504‑00‑##‑10‑02 probes. Use caution, verify with vendor.
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As with any eddy‑current proximity probe — accuracy and reliability depend heavily on proper gap, correct target material (conductive metallic shaft), correct wiring, and using a compatible conditioning system. Mixing with non‑Bently or non‑specified electronics (“Frankenstein combinations”) can lead to erroneous readings or loss of reliability.
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The 7200‑series probes are standard‑mount — they might not be suitable for extremely confined or unusual geometries, or for axial/thrust measuring (unless used with proper housings or special mount/probe types).
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Inquiry now: miya@mvme.cn
Bently Nevada Hot Series:
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