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Proximity Probe Housing Assembly
API 670 compliant external housing component
Direct machine casing installation with no standoff adapter
CSA Type 4 / IP66 weatherproof, dustproof, and oil-mist leakproof rating
The 21000-00-00-00-41-04-02 is an industrial-grade, externally mounted proximity probe housing assembly supplied in an empty enclosure configuration with no probe or cable pre-installed, allowing the separate installation of a compatible reverse-mount sensor based on field requirements.
A probe sleeve of optional length
A reverse mount proximity probe
A dome cover that screws into the body of the housing
This 21000 series aluminum housing assembly is available with Canadian Standards Association (CSA) approvals and is rated explosion-proof for hazardous areas, making it authorized for intrinsically safe applications. Certified as a CSA Type 4 enclosure, the system ensures a rugged weatherproof, dustproof, and oil-mist leakproof seal. It fully complies with the American Petroleum Institute’s (API) 670 Standard for externally mounted proximity probe housings.
The physical configuration of this specific part number delivers a 4.1-inch (104 mm) probe penetration sleeve depth and a 3/4-14 NPT tapered pipe mounting thread for direct machine casing installation without a standoff adapter, complete with dedicated sealed conduit and cable gland fittings. The paramount technical advantage of this assembly is its online serviceability, enabling safe insertion, micro-gap calibration adjustment (typically to -10 VDC), or complete replacement of the internal sensor from the outside while the machinery remains fully operational, serving as a critical asset protection enclosure component for continuous-process heavy industries.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Thermal Power Generation
Installed outside the bearing pedestals of large conventional steam turbine generator sets to protect proximity probes that monitor shaft radial vibration and axial displacement.
Petroleum Refining
Used outside the casings of critical high-risk, high-speed centrifugal compressors in hydrocracking and catalytic cracking units as a protective shield for externally adjustable probes.
Offshore Oil & Gas Drilling Platforms
Provides moisture-proof and explosion-proof sealing protection for critical Keyphasor (speed) sensors on water injection pumps and gas turbine shaft lines in salt spray and confined spaces.
Hydroelectric Power Generation
Used outside upper, lower, and turbine guide bearing housings of large vertical hydro-generators to prevent oil mist and moisture from eroding runout-monitoring probes.
Iron & Steel / Rolling Mills
Provides dust-proof enclosure protection in the harsh, dusty environments of large blast furnace blowers and heavy-duty rolling mill gearboxes to ensure precise rotor alignment measurements.
Since this specific part number is supplied as an empty enclosure configuration with no probe pre-installed, users must separately install a compatible reverse-mount sensor (such as a 3300 XL 8 mm reverse-mount probe). During external installation and online maintenance, strict compliance with intrinsically safe codes and mechanical torque specifications for the 3/4-14 NPT tapered pipe threads is required to prevent stripping the aluminum housing.
Given its 4.1-inch penetration depth, when inserting, adjusting the internal probe gap (typically calibrated to -10 VDC), or replacing the sensor while the machinery is running, the process must be conducted extremely slowly to avoid catastrophic physical contact between the probe tip and the high-speed rotating shaft. Furthermore, verify that static seals like O-rings at the casing interface remain intact, and securely tighten the external conduit and cable gland combination to maintain its CSA Type 4 (IP66) weatherproof, dustproof, and oil-leakage protection ratings.
Bently Nevada 21000-00-00-00-41-04-02 is fully compliant with the API 670 Standard for externally mounted proximity probe housings. The paramount technical advantage of this assembly is its online serviceability—it enables safe insertion, micro-gap calibration adjustment (typically to -10 VDC), or complete replacement of the internal sensor from the outside while the machinery remains fully operational, serving as a critical asset protection enclosure component for continuous-process heavy industries.
What kind of device is Bently Nevada 21000-00-00-00-41-04-02?
It is an industrial-grade, externally mounted proximity probe housing assembly consisting of an aluminum body and a 304 stainless steel sleeve, with no probe pre-installed inside this specific configuration.
What is the primary purpose of 21000-16-10-00-054-04-02?
It is installed on the exterior casing of large machinery to protect precision vibration probes subsequently installed by the user from physical impacts or fluid erosion in harsh industrial environments.
How do you correctly use the 21000-00-00-00-41-04-02 assembly to measure vibration?
The user must purchase and install a compatible proximity probe separately, thread the whole assembly into the case, and perform online micro-adjustments of the probe depth from the outside until the voltage is correct, then lock it in place.
Which probes can be installed inside the 21000-00-00-00-41-04-02 assembly?
It is generally compatible with Bently Nevada 3300 XL 8 mm, 3300 5 mm, or non-XL 3300 8 mm reverse-mount proximity probes.
What industry standard does this 21000-00-00-00-41-04-02 assembly comply with?
As an externally mounted probe protective enclosure, it fully complies with the American Petroleum Institute's API 670 Standard in terms of mechanical strength and sealing structure.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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