Bently Nevada 21000-34-05-00-056-04-02 Proximity Probe Housing Assemblies

Product information

To externally mount proximity probes, use one of these all-metal Proximity Probe Housing Assemblies: 21000 aluminum probe housing assembly, 24701 stainless steel probe housing assembly .The 21000, 24701, and 164818 Proximity Probe Housing Assemblies consist of the following parts: A dome cover that screws into the body of the housing; Threaded ports for conduit connections; A probe sleeve of optional length; O-rings; A reverse mount proximity probe；A thread seal; Optional conduit fittings; An optional standoff adapter. 

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Frequently Asked Questions (FAQ)

Q: If the installation needs to be tilted due to space constraints on site, what are the requirements for the lateral bending resistance of the 3/4 NPT thread due to the all-metal gravity distribution of 21000-34-05-00-056-04-02?
A: While the aluminum housing is lighter than stainless steel, its 5.6-inch center of gravity is farther. For non-vertical installation, the 3/4-14 NPT female threads on the machine must ensure at least 5 fully engaged threads and be secured with high-strength thread sealant to prevent loosening due to lateral alternating stress.

Q: What lead port configurations does the 21000-34-05-00-056-04-02 provide for external conduit connections?
A: Code "04" indicates that this assembly only includes a single 3/4-14 NPT blind plug; the explosion-proof cable gland or flexible conduit connector must be purchased separately by the user according to on-site installation specifications.

Q: Since the 21000-34-05-00-056-04-02 comes with a 0.5-meter internal cable, how can we prevent the cable from twisting and breaking when adjusting the depth of the connector inside the aluminum box?
A: The external cable connector must be disconnected before adjustment, and forced rotation under cable stress is prohibited.

Q: If the process change results in a larger bearing clearance, can the 8mm probe head inside the 21000-34-05-00-056-04-02 be directly replaced with an 11mm or 16mm probe?
A: It cannot be directly replaced. The housing is designed for code "34" (8mm probe), and larger probes cannot pass through the existing sleeve.

Q: When using 21000-34-05-00-056-04-02, is there an extension sleeve between the protective box base and the machine surface?
A: No. Code "00" indicates that this configuration does not use a standoff adapter; the protective box base will directly adhere to the mounting surface of the machine housing.

Application

Power Plants: Monitors shaft vibration and displacement of large steam turbine generators, feedwater pumps, and fans.

Hydropower Plants: Installed on turbine-generator shafts and thrust bearings to prevent mechanical wear and failures.

Nuclear Power Plants: Provides reliable condition monitoring for critical rotating equipment such as main pumps and turbines.

Large Steel Plants: Monitors bearing operation of blast furnace blowers and TRT systems.

Air Separation Plants: Monitors centrifugal air compressors supplying high-pressure gas for steel and chemical industries.

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