Bently Nevada 21000-16-05-15-102-03-02

Bently Nevada 21000-16-05-15-102-03-02

Product Overview This assembly is a complete externally mounted proximity probe housing designed for large industrial rotating machinery. It incorporates a 3300 XL 8 mm reverse mount proximity probe with 0.5 meter integral cable, a 1.5 inch standoff adapter, and a probe sleeve providing 10.2 inches of total penetration depth. The housing allows external access to the proximity probe and extension cable, permitting gap adjustment or probe replacement without disassembly of the machine casing. It is fully compliant with API 670 standards for externally mounted proximity probe housings and carries CSA explosion-proof certification for hazardous area deployment.

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Description

Bently Nevada 21000-16-05-15-102-03-02

Technical Specifications

  • Base Model: 21000 aluminum proximity probe housing assembly
  • Probe Type: 3300 XL 8 mm reverse mount proximity probe
  • Probe Cable Length: 0.5 meter (20 inches)
  • Standoff Adapter Length: 1.5 inches (38 mm)
  • Probe Penetration Depth: 10.2 inches (259 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 for cable sizes 1/8 to 3/16 inches, 1/4 to 5/16 inches, and 5/16 to 3/8 inches
  • 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 ambient -50°C to +40°C, T4 at ambient -50°C to +80°C

Functional Features

  • All-metal construction with aluminum body and 304 stainless steel sleeve
  • Dome cover screws into housing body for quick internal access
  • Threaded ports for conduit connections with integrated cable sealing
  • Reverse mount proximity probe pre-installed in sleeve
  • Fluorocarbon O-rings and thread seals for environmental protection
  • Standoff adapter provides mechanical offset from mounting surface
  • External gap adjustment capability without machine disassembly
  • Compatible with 3300 XL 8 mm proximity transducer systems

Application Scenarios

  • Large steam turbine bearing vibration monitoring
  • Centrifugal compressor shaft displacement measurement
  • Industrial pump radial vibration surveillance
  • Generator rotor dynamics monitoring
  • Gearbox shaft position tracking
  • Hazardous area rotating machinery protection

Performance Parameters

  • Maximum combined C plus D dimension: 13.5 inches (343 mm) for 0.5 meter probe cable with non-visible part number and serial number label
  • Probe linear range: 2.0 mm (80 mils) for 3300 XL 8 mm probe
  • Target gap voltage: -10 Vdc at center of linear range
  • Vibration frequency response: 0 to 10 kHz
  • Structural rigidity maintains probe alignment under operational vibration

Material Composition

  • Housing body: Cast aluminum alloy with protective finish
  • Probe sleeve: AISI 304 stainless steel
  • Dome cover: Aluminum with machined threads
  • O-rings: Fluorocarbon elastomer for chemical and temperature resistance
  • Thread seal: PTFE or similar high-temperature sealing material
  • Probe tip: Polyphenylene sulfide
  • Probe case: AISI 304 stainless steel

Structural Characteristics

  • Cylindrical body with external 3/4-14 NPT mounting threads
  • Internal probe sleeve with reverse mount probe retention threads
  • Dome cover with knurled or wrench flats for hand tightening
  • Conduit entry port with internal threads for 3/4-14 NPT fittings
  • Standoff adapter integrated between housing body and machine surface
  • Cable seal grip with multi-size grommets for various cable diameters

Working Principle The housing serves as a mechanical mounting platform and environmental barrier for the eddy-current proximity probe. The reverse mount probe is threaded into the internal sleeve from the housing interior, with the probe tip facing inward toward the machine shaft. The sleeve length and standoff adapter combine to position the probe tip at the correct distance from the target surface. As the shaft rotates, the probe detects changes in the eddy-current field induced in the metal surface, generating a voltage signal proportional to the gap distance. The housing maintains this critical geometric relationship while protecting the probe and cable from external contaminants, pressure, and mechanical damage.

Installation Requirements

  • Machine mounting boss must be machined with 3/4-14 NPT threads perpendicular to shaft centerline
  • Minimum of 5 full threads of NPT engagement required for pressure containment
  • Apply industrial thread sealant to mounting threads for pressurized lubricant applications
  • Total penetration depth of 10.2 inches requires verification of internal machine clearance
  • For penetration lengths exceeding 12 inches, additional sleeve support must be added near the probe to prevent resonance
  • Route probe cable through conduit entry and connect to extension cable using provided cable seal grip
  • Adjust probe gap while monitoring output voltage with digital voltmeter until -10 Vdc is achieved

Usage Precautions

  • Sleeve lengths longer than 304 mm require additional support to reduce vibration
  • Probe lead must be longer than the sleeve length to allow proper internal routing
  • Verify O-ring integrity before installing dome cover to prevent moisture ingress
  • Do not overtighten dome cover to avoid damaging threads
  • Ensure conduit fittings are properly sealed to maintain explosion-proof integrity
  • Regularly inspect housing for corrosion in harsh chemical environments
  • Counterbore machine case if necessary for penetration lengths between 1.0 and 2.0 inches to reduce probe side view effects

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