Bently Nevada 21000-28-05-00-035-01-02 is an aluminum proximity probe housing assembly designed to support external installation of a 3300 XL 8 mm proximity probe in machinery monitoring systems. This exact configuration combines an approval-option probe with a 0.5 m cable, no standoff adapter, a 3.5 in penetration length, one 3/4-14 NPT explosion-proof fitting, one matching plug, and a 3/4-14 NPT mounting thread within a protected housing arrangement.
When installed with the compatible extension cable and Proximitor Sensor, the assembly supports non-contact shaft vibration and position measurement where controlled probe access and stable mechanical placement are required. Installation should follow the manufacturer’s requirements for penetration, mounting, cable routing, hazardous-area approval, target geometry, electrical length, initial gap, and monitor-channel verification.
Use 21000-28-05-00-035-01-02 as a complete ordered housing configuration with its 3300 XL 8 mm probe, 0.5 m probe cable, no standoff adapter, 3.5 in penetration, supplied fitting and plug, and 3/4-14 NPT mounting thread. Confirm that the machine housing and probe target meet the installation requirements in Bently Nevada Datasheet 141600 Rev. AC.
The installed probe must be paired with the compatible 3300 XL 8 mm extension cable and Proximitor Sensor required for the specified total electrical length and monitor input. Do not mix incompatible probe system families, approval configurations, mounting threads, or electrical lengths.
Bently Nevada Datasheet 141600 Rev. AC documents the 21000, 24701, and 164818 Proximity Probe Housing Assemblies. Availability of the exact 21000-28-05-00-035-01-02 ordering combination should be confirmed at procurement because probe, fitting, thread, approval, cable, and penetration options may change independently.
Do not select a replacement by housing appearance alone. Match the complete order code, housing material, probe type, cable length, standoff option, probe penetration, fittings, mounting thread, hazardous-area approvals, and compatible 3300 XL 8 mm system components; then verify probe position, gap, wiring, and monitor channel operation after replacement.

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