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The 21000-28-05-40-026-04-02 is an externally mounted protective housing compliant with the API 670 Standard. It is utilized for online monitoring of bearing radial vibration and Keyphasor signals on rotating machinery. Its mechanical function allows external probe gap adjustment or probe replacement while the machine remains in operation (online) without machine disassembly, preventing unscheduled downtime and supporting the operating status of factory assets.
A probe sleeve of optional length
A reverse mount proximity probe
An optional standoff adapter
The 21000-28-05-40-026-04-02 Proximity Probe Housing Assembly is utilized when mounting proximity probes through the machine case and is applied for radially mounted transducers, such as vibration or Keyphasor measurements. This assembly features an aluminum body with a 304 stainless steel sleeve, pre-installed with a 3300 XL 8 mm Proximity Probe, a 0.5-meter (1.6 feet) cable, a 4.0-inch standoff adapter, and a 2.6-inch probe penetration depth. The use of this housing allows external access to the proximity probe and its extension cable, permitting gap adjustment or probe replacement without machine disassembly.
The 21000 aluminum housing provides a Canadian Standards Association (CSA) approval for explosion-proof hazardous areas and is certified as a CSA Type 4 enclosure. It is fully compliant with the American Petroleum Institute's (API) 670 Standard for externally mounted proximity probe housings. When installed in conjunction with an approved transducer system and appropriate intrinsically safe (I.S.) barriers, the assembly functions within intrinsically safe hazardous area applications. This configuration is equipped with one explosion-proof cable fitting and a 3/4-14 NPT mounting thread.
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.
Petroleum Refining and Refineries
Installed on centrifugal compressors within fluid catalytic cracking (FCC) and hydrodesulfurization units to protect critical bearing vibration and displacement sensors in high-temperature, high-pressure, and flammable environments.
Offshore Oil and Gas Platforms
Used on high-pressure water injection pumps and gas turbines aboard offshore drilling rigs and FPSOs to resist heavy salt-spray corrosion and prevent explosions triggered by combustible gases.
Thermal Power Generation
Mounted on large steam turbines, generator main bearing housings, and boiler feedwater pumps to ensure quick troubleshooting of sensors without casing teardown in high-temperature oil-mist environments.
Nuclear Power Generation
Utilized for protecting sensor loops in nuclear island auxiliary systems (e.g., main feedwater circulation pumps, large cooling fans), meeting strict electrical explosion-proof and rapid online maintenance specifications outside the containment.
Petrochemicals and Basic Chemicals
Protects eddy current probes on ethylene cracked gas compressors and propylene compressor bearings, providing dual physical and electrical protection in harsh Zone 1/Zone 2 environments filled with flammable hydrocarbon gases.
Marine Engineering and Shipbuilding
Installed on gas turbine propulsion systems, cargo oil pumps, and main propulsion shaft bearings of large LNG carriers to withstand extreme high salt-spray and humidity environments on the high seas.
When using the 21000-28-05-40-026-04-02 aluminum housing, ensure gas-tight sealing on the 3/4-14 NPT threads and the explosion-proof fitting to prevent the ingress of flammable gases, oil, or water. During online gap adjustment or replacement of the internal 8 mm probe, avoid pulling the cable, and strictly de-energize the loop or use compliant safety barriers in explosive gas environments to maintain explosion-proof integrity.
Built with a certified 3300 XL 8mm probe (0.5m cable), 4.0" standoff, and 2.6" sleeve, the 21000-28-05-40-026-04-02 mounts via 3/4-14 NPT. It delivers external in-situ accessibility, allowing gap adjustment, troubleshooting, and replacement without machine shutdown or casing teardown, minimizing downtime and labor costs.
It is an externally mounted, explosion-proof proximity probe housing assembly used to protect and adjust probes mounted through machine cases.
What probe model is built into 21000-28-05-40-026-04-02?
According to code "-28", it is pre-installed with a 3300 XL 8 mm proximity probe.
What material is the housing of 21000-28-05-40-026-04-02 made of?
Its main body is constructed of aluminum alloy, paired with an internal stainless steel sleeve.
How to use products like 21000-28-05-40-026-04-02?
Thread it into the machine case to let the internal probe face the shaft surface, allowing external gap adjustment or probe replacement without machine disassembly.
What are the primary applications of 21000-28-05-40-026-04-02?
It is utilized for monitoring bearing radial vibration and Keyphasor signals on rotating machinery like turbines, compressors, and pumps.
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