Description
Bently Nevada 21000-16-10-15-144-03-02
Technical Specifications
- Base Model: 21000 aluminum proximity probe housing assembly
- Probe Type: 3300 XL 8 mm reverse mount proximity probe
- Probe Cable Length: 1.0 meter (39 inches)
- Standoff Adapter Length: 1.5 inches (38 mm)
- Probe Penetration Depth: 14.4 inches (366 mm)
- Fittings Configuration: One 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, one cable seal grip with grommets
- Mounting Thread: 3/4-14 NPT
- Housing Material: Aluminum body with 304 stainless steel sleeve
- Weight: 1.1 kg (2.4 lb) typical without fittings
- Operating Temperature: -51°C to +177°C (-60°F to +351°F)
- Enclosure Rating: CSA Type 4
- Hazardous Area Approval: CSA certified explosion-proof
Functional Features
- 1.0 meter probe cable for extended routing flexibility
- 14.4 inch deep penetration for very thick machine casings
- 1.5 inch standoff adapter for mechanical offset
- Reverse mount probe pre-installed
- External access for gap adjustment and probe replacement
- Complete cable seal kit with multiple grommet sizes
- API 670 and CSA explosion-proof compliance
Application Scenarios
- Very large steam turbines with deep bearing housings
- Heavy industrial compressors with thick casing walls
- Large generators requiring extended probe reach
- Multi-stage pumps with substantial housing thickness
- Applications requiring visible probe part number label
Performance Parameters
- Maximum C plus D dimension with visible label: 17.0 inches (432 mm) for 1.0 meter cable
- Maximum C plus D dimension overall: 29.2 inches (742 mm) for 1.0 meter cable
- Probe linear range: 2.0 mm (80 mils)
- Scale factor: 7.87 V/mm (200 mV/mil)
- Target gap voltage: -10 Vdc
Material Composition
- Housing body: Cast aluminum alloy
- Probe sleeve: AISI 304 stainless steel
- Dome cover: Aluminum
- O-rings: Fluorocarbon elastomer
- Probe case: AISI 304 stainless steel
- Cable insulation: Fluorinated ethylene propylene
Structural Characteristics
- Extended 14.4 inch sleeve length
- 1.0 meter integral coaxial cable
- Standard dome cover with threaded retention
- 3/4-14 NPT mounting thread
- Conduit entry with cable seal grip
Working Principle The 1.0 meter cable provides additional length for routing from the probe tip through the housing and out to the extension cable or Proximitor sensor. The 14.4 inch penetration depth is achieved through the extended stainless steel sleeve, which maintains precise probe alignment over the long distance from mounting surface to target shaft. The eddy-current sensing principle remains identical to shorter configurations, with the probe detecting minute changes in gap distance between the probe tip and rotating shaft surface.
Installation Requirements
- Verify machine internal clearance for 14.4 inch penetration
- Additional sleeve support mandatory for this extended length
- Mounting boss must have adequate depth for full NPT thread engagement
- Route 1.0 meter cable carefully to avoid sharp bends
- Connect to extension cable using provided seal grip and grommet
- Adjust gap to -10 Vdc target
Usage Precautions
- Extended sleeve absolutely requires additional support to prevent resonance
- 1.0 meter cable provides routing flexibility but must not be kinked
- Verify probe label visibility if required for asset tracking
- Ensure cable seal grip is properly tightened to maintain environmental seal
- Inspect long sleeve for straightness before installation
