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21000-00-00-00-250-03-02

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The Bently Nevada 21000-00-00-00-250-03-02 is an all-metal, externally mounted proximity probe housing assembly designed for continuous vibration and shaft position monitoring.
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Technical specifications for 21000-00-00-00-250-03-02

  • Manufacturer:
    Bently Nevada
  • Part Number:
    21000-00-00-00-250-03-02
  • Product Family:
    21000, 24701, and 164818 Proximity Probe Housing A
  • Housing Material:
    Aluminum body, 304 stainless steel sheath
  • Operating Temperature Range:
    -51°C to +177°C (based on 3300 XL 8mm probe)
  • Storage Temperature Range:
    -51°C to +177°C
  • Housing Protection Rating:
    CSA Type 4 (Explosion-proof, suitable for hazardous areas)
  • Mounting Thread:
    3/4-14 NPT (with option F=02)
  • Weight:
    1.1 kg
  • Estimated shipping dimensions:
    25.00x8.33x16.16cm
  • Tariff Code:
    9031809090
  • 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 Operating Firmware & Updates Applications

Features:

  • Extended Probe Penetration Capability
  • Ready for Hazardous Area Installations
  • Direct Mounting Without Standoff Adapter
The Bently Nevada 21000-00-00-00-250-03-02 features a 25.0-inch (635 mm) stainless steel sleeve, allowing deep installation through inner bearing housings for measuring shaft vibration in large machinery.

This housing is designed with CSA explosion-proof certification (when ordered with CA version and appropriate fittings), making it suitable for Class I, Divisions 1 and 2 environments in oil & gas and petrochemical facilities.

With Option C set to 00, the Bently Nevada 21000-00-00-00-250-03-02 is configured for direct machine case mounting, eliminating additional interfaces and reducing potential leak paths while maintaining the full 25.0-inch probe penetration depth.

The 21000-00-00-00-250-03-02 Bently Nevada Proximity Probe Housing Assemblies may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 21000-00-00-00-250-03-02 Proximity Probe Housing Assemblies Manuals,Datasheets,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 21000-00-00-00-250-03-02 Proximity Probe Housing Assemblies

General

  • Manufacturer Bently Nevada
  • Model 21000-00-00-00-250-03-02
  • Condition New Original ready stock
  • Product Family 21000-00-00-00-100-03-02,21000-00-00-00-150-03-02,21000-00-00-00-200-03-02
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.
  • The Proximity Probe Housing Assemblies operates reliably across a wide temperature range. It is suitable for both indoor and outdoor industrial environments. This ensures consistent performance.
  • It supports continuous operation without degradation. The materials used resist wear and environmental stress. This ensures long-term stability.
  • Installation is flexible, allowing routing through complex industrial layouts. The Proximity Probe Housing maintains performance even in tight spaces. This enhances usability.
  • It requires minimal operational oversight. Once installed, it functions reliably without frequent adjustments. This reduces operational workload.
  • The Proximity Probe Housing itself does not require firmware updates. It functions as a passive component. This simplifies system management.
  • Compatible with updated monitoring systems. Supports modern diagnostics features. Ensures long-term usability.
  • No software configuration required. Plug-and-play functionality. Reduces setup time.
  • Works with evolving system architectures. Ensures backward compatibility. Protects investment.
  • Used in turbine monitoring systems. Ensures safe operation. Prevents failures.
  • Applied in oil & gas facilities. Supports harsh environment monitoring. Improves reliability.
  • Suitable for power plants. Enhances equipment protection. Reduces downtime.
  • Used in manufacturing plants. Enables predictive maintenance. Improves productivity.
Description
The Bently Nevada 21000-00-00-00-250-03-02 is a non-contact probe housing assembly from Bently Nevada's trusted 21000 series, built for externally mounting proximity probes in critical rotating machinery such as turbines, compressors, and pumps. This specific configuration utilizes a durable aluminum body combined with a 304 stainless steel sleeve measuring 25.0 inches (635 mm), making it suitable for applications requiring deep probe penetration through bearing housings. It comes standard with 3/4-14 NPT mounting threads and includes a conduit fitting configuration (E:03) featuring one NPT plug, one reducer, and a cable seal grip for cable diameters from 1/8 to 3/8 inches.

Engineered for harsh industrial environments, the Bently Nevada 21000-00-00-00-250-03-02 offers robust mechanical protection and is rated CSA Type 4 for enclosure integrity. It supports operating temperatures up to +177°C when paired with compatible probes and includes a reverse mount probe sleeve with a minimum penetration length of 1.0 inch. However, because this housing is ordered without a probe (A:00) and without a probe cable (B:00), users must purchase a compatible reverse mount probe (such as 3300 XL 8mm or NSv series) and a separate proximitor system to achieve full measurement functionality.

For applications where the combined standoff adapter plus probe penetration length exceeds 300 mm (12 inches), additional sleeve support (part number 37948-01) is mandatory to prevent resonance. The Bently Nevada 21000-00-00-00-250-03-02 is fully compliant with API 670 standards and is suitable for both standard and hazardous area installations when ordered with the appropriate optional approvals.

Alternative Names
21000-00-00-00-100-03-02 21000-00-00-00-150-03-02 21000-00-00-00-200-03-02 21000-00-00-00-300-03-02 21000-00-00-00-350-03-02 21000-00-00-00-400-03-02
Technical notes
The Bently Nevada 21000-00-00-00-250-03-02 is specified as an empty housing assembly with a 25.0-inch sleeve, and because it is ordered with AA=00 (no probe) and BB=00 (no probe cable), it requires the separate purchase of a compatible reverse mount probe, extension cable, and proximitor to function as a complete vibration monitoring system. Users must also add sleeve support (p/n 37948-01) if the total penetration length exceeds 300 mm to avoid mechanical resonance.
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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 Bently Nevada 21000-00-00-00-250-03-02 used for?
The Bently Nevada 21000-00-00-00-250-03-02 is used as an externally mounted housing for proximity probes to continuously monitor shaft vibration, displacement, and position in rotating machinery such as turbines, compressors, and generators.
Does the Bently Nevada 21000-00-00-00-250-03-02 include a probe?
No. This part number is ordered with no probe (AA=00) and no probe cable (BB=00). You must purchase a compatible reverse mount probe (e.g., 3300 XL 8mm, NSv, or 11mm) and a proximitor separately.
What is the maximum probe penetration length for this housing?
The D option is set to 25.0 inches (635 mm). However, if the total of standoff adapter (C) plus probe penetration (D) exceeds 300 mm (12 inches), you must add a probe support / oil seal (part number 37948-01) to prevent mechanical resonance.
Can the Bently Nevada 21000-00-00-00-250-03-02 operate in high-temperature environments?
Yes. When paired with a compatible 3300 XL series probe, the housing supports operating and storage temperatures from -51°C to +177°C (-60°F to +351°F). However, avoid exposing probes to temperatures below -34°C to prevent premature pressure seal failure.