Description
Bently Nevada 21000-16-10-15-081-03-02
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: 8.1 inches (206 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
- 8.1 inch penetration for moderate-depth casings
- 1.5 inch standoff adapter for mechanical offset
- 1.0 meter cable for flexible routing
- Pre-installed reverse mount probe
- External access for maintenance
- API 670 compliant design
- CSA explosion-proof certification
Application Scenarios
- General industrial steam turbines
- Standard centrifugal compressors
- Medium-sized pumps and motors
- Industrial gearboxes
- Generator bearing monitoring
Performance Parameters
- Probe linear range: 2.0 mm (80 mils)
- Scale factor: 7.87 V/mm (200 mV/mil)
- Target gap voltage: -10 Vdc
- Frequency response: 0 to 10 kHz
- Maximum C plus D dimension: 29.2 inches for 1.0 meter cable
Material Composition
- Housing body: Cast aluminum alloy
- Probe sleeve: AISI 304 stainless steel
- Standoff adapter: Aluminum
- Dome cover: Aluminum
- O-rings: Fluorocarbon elastomer
- Probe case: AISI 304 stainless steel
Structural Characteristics
- 8.1 inch stainless steel sleeve
- 1.5 inch standoff adapter
- 1.0 meter integral cable
- Standard dome cover with threaded retention
- 3/4-14 NPT mounting thread
Working Principle The 1.5 inch standoff adapter positions the aluminum housing away from the machine surface, while the 8.1 inch sleeve extends through the casing to place the probe tip at the correct distance from the shaft. The reverse mount probe faces the shaft from inside the housing, with its cable routed back through the sleeve and out via the conduit port. The eddy-current field generated at the probe tip interacts with the shaft surface to produce the gap-dependent voltage signal.
Installation Requirements
- Mount standoff to machine surface
- Thread housing into standoff with 3/4-14 NPT
- Verify 8.1 inches internal clearance
- Route 1.0 meter cable through conduit
- Adjust probe gap to -10 Vdc
Usage Precautions
- Sleeve length under 12 inches does not require additional support
- Verify standoff adapter seal integrity
- Ensure adequate clearance for dome cover removal
- Inspect sleeve for straightness before installation
