The Bently Nevada 21000-16-05-15-098-03-02, also cataloged as the 21000 Proximity Probe Housing Assembly, serves as a dedicated mechanical interface for eddy-current proximity probe installation and alignment within Bently Nevada 3300 XL Transducer Systems. It provides direct physical support and environmental sealing for precision shaft vibration measurement circuits.
Hardware Specifications
Parameter
Specification
Model Brand
Bently Nevada
Origin
USA
Weight
1.08 kg
Dimensions
8.5 x 8.5 x 30.5 cm
Operating Temp
-40 to 85 degC
Power Consumption
Passive component, no power required
Mounting Thread
3/4-14 NPT
Cable Gland Range
1/8 to 3/8 inches OD
Probe Compatibility
3300 XL 8 mm Eddy-Current Proximity Probe
Eddy-Current Probe Scaling and Gap Voltage Validation
This housing assembly supports precise eddy-current probe scaling by maintaining fixed probe standoff distances relative to the target surface. Gap voltage validation targets -10 VDC at nominal clearance, ensuring linear transducer response for rotor dynamics monitoring. Cross-talk suppression is achieved via rigid mechanical isolation from adjacent sensor assemblies, minimizing electromagnetic interference in densely instrumented machinery trains.
Frequently Asked Questions
Q: Can this housing be installed without removing the proximity probe?
A: No. The probe must be inserted into the housing prior to final mounting to ensure correct axial positioning and avoid damage to the probe tip.
Q: Is hot-swapping supported for the probe within this assembly?
A: No. System shutdown is required before removal or replacement to prevent erroneous transient signals and potential damage to the conditioning electronics.
Q: What torque specification applies to the NPT thread engagement?
A: Use standard NPT pipe thread engagement of at least 5 full threads with appropriate thread sealant; torque values should follow ASME B1.20.1 guidelines for 3/4-14 NPT steel fittings.
Field Installation Guidelines
Mount the assembly directly to a rigid machine structure using the 3/4-14 NPT threaded boss. Apply compatible anti-seize compound if stainless-to-stainless threading is used. Ensure the probe cable shield is grounded at the termination point only, avoiding ground loops. Maintain minimum bend radius of the probe cable to prevent signal attenuation. Verify probe standoff distance with calibrated feeler gauges before final tightening.
