Configured for external installation and mechanical positioning of eddy current proximity probe sensing elements in rotating machinery monitoring systems, the Bently Nevada 21000-16-05-00-094-03-02 (21000 Proximity Probe Housing Assembly) provides direct mechanical routing and sealed environmental isolation for probe insertion and adjustment within TSI measurement chains.
Suffix Breakdown & Model Matrix
Suffix Code
Option Name
Configuration Details
21000
Base Model
Aluminum housing body with 304 stainless steel probe sleeve
-16
Probe Option
3300 XL 8 mm proximity probe with standard connector interface
-05
Cable Length
0.5 m probe cable (approx. 20 inches)
-00
Standoff Adapter
No standoff adapter included
-094
Probe Penetration
9.4 inches probe sleeve insertion depth
-03
Fitting Option
3/4-14 NPT plug, 3/4-14 to 1/2-14 reducer, cable seal grip assembly
-02
Mounting Thread
3/4-14 NPT mounting interface
Hardware Specifications
Parameter
Specification
ModelBrand
Bently Nevada 21000-16-05-00-094-03-02
Origin
USA
Weight
approx. 1.1 kg
Dimensions
Not specified
OperatingTemp
-51 degC to +177 degC (probe rated)
PowerConsumption
Passive (no external power required)
Material
Aluminum housing, 304 stainless steel sleeve
Mounting Thread
3/4-14 NPT
Probe Type
3300 XL 8 mm proximity probe
Penetration Depth
9.4 in
Eddy-Current Probe Scaling and Signal Integrity Control
Bently Nevada 21000 housing assemblies implement a mechanically fixed probe positioning reference for eddy current displacement measurement chains. The probe-to-target gap is maintained through calibrated sleeve insertion depth, supporting standardized gap voltage validation behavior within typical -10 VDC to 0 VDC linear operating range of proximity transducer systems.
Cross-talk suppression is achieved through controlled probe routing geometry and grounded metallic housing continuity. Cable shielding termination within the sealed gland assembly reduces electromagnetic coupling between adjacent probe channels in multi-probe installations on shared machine casings.
Eddy current scaling consistency is maintained by fixed mechanical penetration depth, ensuring repeatable sensitivity coefficients across replacement probes within identical mounting geometries.
Frequently Asked Questions
Q: Can the probe assembly be replaced without removing the housing from the machine case? A: The design supports external probe insertion and withdrawal through the probe sleeve. Mechanical retention remains via threaded mounting interface; housing removal is not required for probe exchange.
Q: Does probe cable length (-05 option) affect signal calibration? A: The 0.5 m cable is electrically matched for standard 3300 XL probe interface impedance. No field recalibration is required provided connector integrity is maintained.
Q: Is electrical isolation required between housing and machine ground? A: The housing is mechanically grounded through NPT mounting. Signal reference grounding is handled at the monitoring system interface, not at the housing body.
Field Installation Guidelines
The 3/4-14 NPT mounting interface shall be installed with standard thread engagement depth (minimum 5 full turns recommended for sealing integrity). Use PTFE-based sealing compound compatible with industrial vibration environments.
Probe sleeve insertion must maintain axial alignment to prevent mechanical scraping of probe tip during installation. Cable sealing grommets must be selected according to actual cable diameter range (1/8 to 3/8 in) to maintain ingress protection performance.
Shield termination should be executed at system-side instrumentation ground only. Avoid dual grounding paths between housing body and monitoring system to prevent circulating current loops in proximity probe signal return paths.
