Description
Bently Nevada 21000-16-05-15-037-01-02
Technical Specifications
- Base Model: 21000 aluminum proximity probe housing assembly
- Probe Type: 3300 XL 8 mm reverse mount proximity probe
- Probe Cable Length: 0.5 meter (20 inches)
- Standoff Adapter Length: 1.5 inches (38 mm)
- Probe Penetration Depth: 3.7 inches (94 mm)
- Fittings Configuration: One explosion-proof fitting and one plug
- 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 for Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G
- Temperature Code: T5 at -50°C to +40°C, T4 at -50°C to +80°C
Functional Features
- Compact 3.7 inch penetration with 1.5 inch standoff
- 0.5 meter cable for close-coupled installations
- Explosion-proof fitting and plug for hazardous areas
- Reverse mount probe pre-installed
- External access for gap adjustment
- API 670 standard compliance
- CSA explosion-proof certification
Application Scenarios
- Hazardous area pump monitoring
- Petrochemical compressor protection
- Refinery turbine surveillance
- Explosion-proof motor bearing monitoring
- Class I Division 2 rotating equipment
Performance Parameters
- Maximum C plus D dimension: 13.5 inches (343 mm) for 0.5 meter cable
- 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
Material Composition
- Housing body: Cast aluminum alloy
- Probe sleeve: AISI 304 stainless steel
- Standoff adapter: Aluminum
- Dome cover: Aluminum
- O-rings: Fluorocarbon elastomer
- Explosion-proof fitting: Steel with NPT threads
- Probe case: AISI 304 stainless steel
Structural Characteristics
- 3.7 inch stainless steel sleeve
- 1.5 inch standoff adapter
- 0.5 meter integral cable
- Explosion-proof fitting and plug instead of cable seal grip
- Standard dome cover
- 3/4-14 NPT mounting thread
Working Principle The housing positions the reverse mount probe at the correct gap distance from the shaft through the combined length of the 1.5 inch standoff and 3.7 inch sleeve. The explosion-proof fitting provides a flame-tight seal for conduit entry in hazardous atmospheres, preventing ignition propagation. The probe operates on standard eddy-current principles, with the 0.5 meter cable connecting to extension cables or Proximitor sensors outside the hazardous area.
Installation Requirements
- Mount standoff adapter to machine surface
- Thread housing into standoff with 3/4-14 NPT
- Verify 3.7 inches internal clearance
- Install explosion-proof fitting per NEC or local codes
- Route cable through explosion-proof conduit system
- Adjust probe gap to -10 Vdc
Usage Precautions
- Explosion-proof fitting must be installed per applicable electrical codes
- Verify fitting torque to maintain explosion-proof seal
- Short 0.5 meter cable limits Proximitor mounting location
- Counterbore machine case if necessary for short penetration
- Ensure O-ring and thread seal integrity for environmental protection
- Only CA versions of housing are rated explosion-proof when ordered with E:00, E:01, E:02, or E:04 options
