Bently Nevada 21000-16-10-00-046-03-02

Bently Nevada 21000-16-10-00-046-03-02

Product Overview This assembly provides a 4.6 inch penetration depth without standoff adapter, representing one of the more compact configurations in the 21000 series. It is designed for machinery with thin walls or minimal distance between the external mounting surface and the target shaft. The 1.0 meter cable offers routing flexibility, while the absence of a standoff adapter keeps the external dimensions minimal. This configuration is well-suited for small industrial pumps, motors, and compact turbomachinery.

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Description

Bently Nevada 21000-16-10-00-046-03-02

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: None
  • Probe Penetration Depth: 4.6 inches (117 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

  • Compact 4.6 inch penetration
  • Direct mounting without standoff
  • 1.0 meter probe cable
  • Pre-installed reverse mount probe
  • External access for gap adjustment
  • API 670 standard compliance
  • CSA explosion-proof certification

Application Scenarios

  • Small industrial pumps
  • Electric motor bearing monitoring
  • Compact gearboxes
  • Thin-wall process equipment
  • Space-constrained installations

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

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

Structural Characteristics

  • 4.6 inch stainless steel sleeve
  • No standoff adapter
  • 1.0 meter integral cable
  • Dome cover with threaded retention
  • 3/4-14 NPT mounting thread

Working Principle The compact sleeve positions the reverse mount probe close to the mounting surface. The probe tip generates an electromagnetic field that induces eddy currents in the nearby shaft surface. Changes in the gap distance between probe and shaft modify the coil impedance, which is converted to a proportional voltage signal by the Proximitor sensor. The housing maintains this precise geometric relationship while providing environmental protection.

Installation Requirements

  • 3/4-14 NPT mounting hole required
  • Verify 4.6 inches of internal clearance
  • Route cable through conduit entry
  • Adjust probe to achieve -10 Vdc gap voltage
  • Ensure flat mounting surface

Usage Precautions

  • Very short penetration requires careful verification of internal clearances
  • Counterbore machine case if necessary to prevent side view interference
  • Ensure probe cable is not pinched during dome cover installation
  • Verify O-ring seal integrity

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