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21000-00-00-40-040-02-02

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The Bently Nevada 21000-00-00-40-040-02-02 is an aluminum probe housing with 4.0" standoff, 4.0" penetration, two explosion-proof fittings/one plug, and 3/4-14 NPT threads.
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Technical specifications for 21000-00-00-40-040-02-02

  • Manufacturer:
    Bently Nevada
  • Part Number:
    21000-00-00-40-040-02-02
  • Product Family:
    21000, 24701, and 164818 Proximity Probe Housing A
  • Product Type:
    Aluminum Probe Housing
  • Stock:
    3
  • Probe Type (A):
    00 = Probe not required
  • Probe Cable Length (B):
    00 = Probe cable not required
  • Standoff Adapter (C):
    40 = 4.0 inches (102 mm)
  • Probe Penetration (D):
    040 = 4.0 inches (102 mm)
  • C + D Dimension:
    8.0 inches (203 mm) – no additional support required
  • Fittings (E):
    02 = Two 3/4-14 NPT explosion-proof fittings, one plug
  • Mounting Thread (F):
    02 = 3/4-14 NPT
  • Enclosure Rating:
    CSA Type 4, Explosion-proof
  • API Compliance:
    API 670 Standard
  • Weight:
    1.1 kg
  • Estimated shipping dimensions:
    47.5x8.5x8.5cm
  • Tariff Code:
    8479899990
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Application Machinery Diagnostic Upgrade Guidelines

Features:

  • CSA Type 4 certified for hazardous area installations with API 670 compliance.
  • 4.0" standoff with 4.0" penetration for symmetrical mounting.
  • Two 3/4-14 NPT fittings with one plug for conduit connections.
The 21000-00-00-40-040-02-02 features a rugged aluminum housing specifically designed for externally mounting proximity probes in hazardous industrial environments. The housing is CSA Type 4 certified, providing explosion-proof protection for installations in potentially explosive atmospheres. This certification ensures that the 21000-00-00-40-040-02-02 meets stringent safety requirements for use in refineries, chemical plants, and other hazardous locations. The housing includes a dome cover that screws securely into the body, threaded ports for conduit connections, and O-rings for sealing.

The 21000-00-00-40-040-02-02 provides balanced mounting with a 4.0-inch standoff adapter (option C:40) and a 4.0-inch probe penetration (option D:040). This symmetrical configuration ensures consistent and predictable probe positioning for accurate measurements. The standoff adapter positions the housing at the optimal distance from the machine case, while the probe penetration determines how far the probe extends toward the target surface.

The 21000-00-00-40-040-02-02 includes two 3/4-14 NPT explosion-proof fittings with one plug (option E:02), providing flexible conduit connection options for hazardous area installations. This dual-fitting configuration allows for convenient cable routing and simplifies installation in complex control cabinet environments. The explosion-proof fittings are CSA rated and maintain the housing's hazardous area certification. The 21000-00-00-40-040-02-02's 3/4-14 NPT mounting thread (option F:02) is the standard for most 21000 installations, ensuring compatibility with standard mounting hardware.

The 21000-00-00-40-040-02-02 Bently Nevada Aluminum Probe Housing may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).

Bently Nevada 21000-00-00-40-040-02-02 Aluminum Probe Housing Manuals, Datasheets, Drivers, Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Bently Nevada 21000-00-00-40-040-02-02 Aluminum Probe Housing Specs

General

  • Manufacturer GE / Bently Nevada
  • Model 21000-00-00-40-040-02-02
  • Condition New Original ready stock
  • Product Family 21000-00-00-00-000-00-02,21000-16-10-15-144-03-02,21000-16-10-15-114-03-02
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Petrochemical & Refining: Installed on critical multi-stage centrifugal pumps, process gas screw compressors, and medium-sized steam turbines.
  • Power Generation: Deployed on combustion gas turbines, auxiliary boiler feed pumps, and large industrial draft fans (forced and induced draft).
  • Pulp & Paper / Water Utilities: Applied on high-volume wastewater pumps, large industrial water intake pumps, and high-load paper mill refining rollers.
  • Heavy Manufacturing: Used on main plant air compressors and massive industrial reduction gearboxes.
  • Radial Vibration (Shaft Dynamic Motion): Measures the raw micro-inch dynamic motion of the shaft relative to the bearing shell. It allows diagnostics engineers to identify common machine faults such as unbalance, shaft misalignment, structural looseness, or fluid-film bearing instabilities (oil whirl and oil whip).
  • Axial Thrust Position (Rotor Displacement): Monitors the micro-movement of the rotor along its longitudinal axis. This is a vital emergency safety loop; excessive axial movement indicates thrust bearing breakdown, which can lead to catastrophic internal rotor-to-stator blade impacts.
  • Keyphasor / Rotational Speed: Provides a once-per-turn reference voltage pulse. This allows the upstream rack to measure precise machine RPM and calculate phase angles, which are mandatory for producing advanced diagnostic plots (such as Orbit, Bode, Polar, and Cascade plots).
  • Rotor Eccentricity: Tracks the peak-to-peak mechanical bow of a large turbine shaft at low turning-gear speeds prior to a hot machine start-up, preventing major thermal imbalance damage.
  • Mechanical Voltage Gapping: Because the housing allows for precise linear threading, technicians calibrate the probe's gap manually before locking it down. A digital multimeter is connected to the external Proximitor sensor's terminals. The probe is threaded through the 4.0-inch sleeve until the DC bias voltage reads exactly -10.0 Vdc (for a standard 3300 XL 8mm probe), which marks the exact center of its linear electrical range (approx. 50 mils or 1.27 mm gap from the shaft).
  • Torque Locking: Once the -10.0 Vdc gap is established, the mechanical locknuts on the 21000 housing must be torqued down to specification to ensure machine casing vibrations do not shift the sensor during long-term operation.
  • Conduit and Environmental Sealing: The -02 suffix features a 3/4-14 NPT thread. It should be securely paired with an approved flexible armored conduit to completely seal the internal coaxial cable from hot lubrication oil splashes, ambient moisture, and dust, maintaining an IP66/NEMA 4X rating.
Description
The Bently Nevada 21000-00-00-40-040-02-02 is an aluminum proximity probe housing assembly designed for externally mounting proximity probes in machinery monitoring applications. This housing provides a robust, explosion-proof enclosure for the probe, protecting it from harsh industrial environments. The 21000-00-00-40-040-02-02 is certified as a CSA Type 4 enclosure and is fully compliant with API 670 Standard. 

The 21000-00-00-40-040-02-02 features two 3/4-14 NPT explosion-proof fittings and one plug (option E:02) and a 3/4-14 NPT mounting thread (option F:02). The 21000-00-00-40-040-02-02's standoff plus penetration dimension (C+D) is 8.0 inches (203mm).

The Bently Nevada 21000-00-00-40-040-02-02 is constructed from aluminum, providing a lightweight yet durable solution for external probe mounting. The 21000-00-00-40-040-02-02 includes O-rings and a dome cover that screws into the housing body for secure sealing. Since the 21000-00-00-40-040-02-02 has a probe penetration length (C+D = 8.0 inches) below 12 inches, no additional sleeve support is required.
Alternative Names
21OOO-OO-OO-4O-O4O-O2-O2 2I000-00-00-40-040-02-02 21000 00 00 40 040 02 02 21000-28-10-00-098-04-02 21000-28-10-00-217-04-02 21000-16-10-15-057-03-02 21000-16-10-15-114-03-02 21000-16-10-15-144-03-02
Technical notes
The Bently Nevada 21000-00-00-40-040-02-02 is an aluminum probe housing with 4.0" standoff, 4.0" penetration, and 3/4-14 NPT threads. CSA Type 4, API 670 compliant, explosion-proof. C+D = 8.0" below threshold. Suitable for vibration/position monitoring on rotating machinery.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is the primary function of the 21000-00-00-40-040-02-02?
It externally mounts proximity probes with 4.0" standoff, 4.0" penetration, and 3/4-14 NPT threads for machine monitoring.
What are the key specifications of the 21000-00-00-40-040-02-02?
Aluminum housing, 4.0" standoff, 4.0" penetration, 3/4-14 NPT threads, CSA Type 4, API 670 compliant.
What fittings does the 21000-00-00-40-040-02-02 include?
It includes two 3/4-14 NPT explosion-proof fittings and one plug (option E:02).
Does the 21000-00-00-40-040-02-02 require sleeve support?
No, with 8.0" C+D below 12 inches, no additional sleeve support is required.

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