The Bently Nevada 21000-28-05-00-105-04-026 operates as a dedicated hardware component for physical protection and environmental isolation of proximity probes within 21000 Series platforms. The hardware permits external mechanical access, adjustment, and removal of proximity sensors during machine operation, preventing process atmosphere leakage or high-pressure lubrication fluid loss across the machine casing boundary layer.

Variant Coding Options

• 21000: Base designator for explosion-proof/weatherproof aluminum proximity probe housing assemblies.

• -28: Probe threaded length option designating 2.8 in.

• -05: Probe total length option designating 0.5 m (1.6 ft).

• -00: Connector option specifying uninstalled, standard coaxial termination.

• -105: Stilling well length option designating 10.5 in total length.

• -04: Thread type option specifying 3/4-14 NPT process and conduit connections.

• -026: Agency approval option specifying combined ATEX, IECEx, and North American hazardous area certifications.

Mechanical Enclosure Specifications

Gap Voltage Validation and Cross-Talk Suppression

The 21000-28-05-00-105-04-026 enclosure regulates the physical orientation and spatial insertion depth of the internal eddy-current probe relative to the target shaft. Precise positioning within the assembly ensures the loop achieves the standard -10 VDC targets during field gap voltage validation routines. Rigid sleeve locks maintain concentric alignment to minimize side loading against the stilling well walls, preventing scale factor distortion and achieving cross-talk suppression between closely spaced radial vibration sensor pairs monitoring complex rotor dynamics.

Package Kit Components

• One (1) Bently Nevada 21000 aluminum housing dome cover and base assembly

• One (1) Integrated 10.5 in threaded stilling well extension sleeve

• One (1) Internal probe compression sleeve locking block with hardware

• Two (2) High-performance Viton sealing rings for fluid-tight isolation

Field Installation Guidelines

• Thread the primary 3/4-14 NPT housing adapter into the machine bearing housing wall, ensuring a minimum engagement of 5 full NPT threads to form a high-pressure seal.

• Guide the passive proximity probe down the internal channel of the 10.5 in stilling well sleeve, taking care not to scrape or twist the integrated coaxial lead line.

• Hook an external digital voltmeter up to the Proximitor signal lines to track active field potentials while adjusting the mechanical sleeve depth.

• Tighten the internal locking hardware onto the probe body once the loop output matches the designated -10 VDC gap validation center coordinate.

• Seal the outer conduit connections using certified thread compound and torque the heavy dome cover completely down to prevent moisture or corrosive gas ingress.

Dispatched Logistics Management

Delivery time: 3-5 days when payment finish, routed via expedited international courier channels utilizing DHL, FEDEX, or UPS. Internal components are enclosed within heavy-walled moisture-vapor barrier anti-static industrial packaging boundaries. Exterior shipments feature double-wall corrugated protective master cartons fitted with custom-molded shock-absorbing polyurethane foam structures to maintain exact mechanical thread and sleeve tolerances during international delivery.

Technical Engineering FAQ

Q: Can an 11 mm proximity probe be mounted inside this specific 21000 housing model?

A: No. The internal sleeve arrangement, unthreaded length (-28), and stilling well parameters are specifically matched to standard 8 mm proximity probe casing geometries. An 11 mm probe requires an alternative internal dimension selection to avoid structural interference.

Q: What step must be performed if process fluid is discovered inside the terminal housing dome?

A: Fluid inside the dome indicates a failure or wear of the internal Viton dynamic O-ring seals. The machine process must be isolated or bypassed so the damaged seals can be extracted and replaced to stop the fluid from bypassing the barrier.

Q: Is a special alignment tool required to ensure the probe tip does not contact the sides of the stilling well?

A: No special tools are needed. The internal guide tracks and compression sleeve are machined to align the probe concentrically within the 10.5 in stilling well, provided the external 3/4-14 NPT thread is tracked straight into the port.