The 21000-28-05-00-056-04-02 is a Bently Nevada aluminum proximity-probe housing assembly for external machine mounting. It includes a 3300 XL 8 mm probe with selectable hazardous-area approvals, 0.5 m probe cable, no standoff adapter, 5.6 in probe penetration, one 3/4-14 NPT plug, and a 3/4-14 NPT mounting thread.
- External proximity probe housing assembly
- Aluminum body
- 304 stainless steel
- 3300 XL 8 mm with selectable approvals
The all-metal housing positions and protects the included reverse-mount proximity probe outside the machine casing while its conduit ports and sleeve route the probe lead to a matched extension cable and Proximitor Sensor for vibration or position measurement. For dependable measurement, follow the official system-matching, target, mounting, cabling, environmental, and approval instructions.
Important Notice: The option-28 probe approval does not by itself make the non-CA 21000 housing explosion-proof. Verify the housing nameplate and current certification.
Apter Power 21000-28-05-00-056-04-02 Original Product Manual
Important Notice: This Apter Power original manual summarizes manufacturer-published technical data for the exact ordering code. Verify the physical nameplate and current manufacturer installation documents before use.
External Machine-Casing MountingProvides a protected external mounting point for a proximity probe on a bearing or machine casing.
Fluid-Film-Bearing MachinerySupports shaft vibration and position measurements through the included 3300 XL 8 mm probe.
Turbines and CompressorsPositions the probe where casing thickness or access requires a dedicated sleeve and housing.
Conduit-Protected InstallationsUses threaded conduit ports and the selected NPT plug for protected cable routing.
API 670 InstallationsThe 21000 housing family is designed for externally mounted proximity probes in API 670 applications.
Selectable Approved Probe SystemsThe included option-28 probe supports selectable approvals, subject to nameplate and installation verification.
Read and follow Bently Nevada 21000, 24701, and 164818 Proximity Probe Housing Assemblies Datasheet 141600 Rev. AC and the applicable installation instructions before use. Verify the complete ordering code from the physical nameplate and match every component to the published system configuration.
1Confirm that the 5.6 in penetration and no-standoff configuration fit the machine casing and target location.
2Use the 13 mm adjustment range only within the official mechanical installation instructions.
3Match the included 0.5 m probe to the correct extension cable and Proximitor Sensor total length.
4Do not infer that the 21000 housing is explosion-proof from the probe approval option or the NPT plug; only specified CA housings carry the published explosion-proof housing rating.
5Verify the included probe nameplate, conduit sealing, mounting threads, target material, and final gap before commissioning.
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