21000-34-00-00-039-04-02 Bently Nevada Probe Housing

Bently Nevada 21000 Series Proximity Probe Housing Assemblies

• Brand & Model Focus – This 21000-34-00-00-039-04-02 assembly includes a factory-installed 3300 XL probe without an attached cable. The Bently Nevada 21000 series uses a CSA Type 4 enclosure, ensuring explosion-proof operation in hazardous areas.
• Precise Mechanical Specifications – The unit features a 3.9 inch probe penetration (suffix 039) and the probe cable is not required (suffix 00). We machine the body from aluminum with a 304 stainless steel sleeve for long-lasting corrosion resistance.
• Fitting Configuration – We supply the housing with a single 3/4-14 NPT plug (fitting option 04). This simplified fitting set suits applications where you prefer to use your own conduit fittings.
• Mounting Thread & Adapter – It comes with the -02 mounting thread option (3/4-14 NPT) because the standoff adapter suffix is -00. This allows direct installation into standard machine case openings without extra hardware.
• Dimensions & Weight – The maximum (C) + (D) dimension reaches 13.5 inches (34.3 cm) with the probe installed. The assembly weighs 1.1 kg (2.4 lb) typical without fittings, making it compact and lightweight.

Technical Specifications & Performance

• Measurement System – The 21000-34-00-00-039-04-02 incorporates a reverse mount 3300 XL 8 mm probe. It delivers a sensitivity of 200 mV/mil (7.87 V/mm) for displacement measurements, ensuring high linearity and resolution for shaft vibration monitoring.
• Frequency Response – The system provides a frequency response of 0 to 10 kHz, covering both slow roll and high-speed machine vibrations. You can rely on its accuracy for critical machinery protection.
• Environmental Tolerance – The aluminum housing and stainless steel sleeve withstand harsh industrial conditions. The assembly operates reliably in temperatures from -35°C to +150°C, with excellent resistance to moisture and dust.
• Electrical & EMC Protection – We integrate the probe with a connector protector inside the housing. The design minimizes electromagnetic interference, ensuring stable signal transmission in noisy plant environments.
• Interchangeability & Linearity – Each unit meets strict linearity tolerances (± 0.025 V) per API 670 standards. The eddy-current sensing technology provides accurate static and dynamic measurements without physical contact.

Frequently Asked Questions (FAQ)

• Is this housing suitable for intrinsically safe applications? Yes, the 21000-34-00-00-039-04-02 comes with selectable hazardous area approvals. You can use it with intrinsically safe barriers for safe operation.
• Why does this version not include a probe cable? The suffix "00" for probe cable length means the customer supplies the cable. This flexibility allows you to use custom cable lengths or existing field wiring.
• What is the maximum temperature the probe can withstand? The 3300 XL probe inside this housing operates continuously from -35°C to +150°C, making it ideal for turbines and compressors.
• Does the assembly include the proximity probe? Yes, the package includes the 3300 XL 8 mm probe, but without an attached cable. The probe mounts inside the housing ready for your cable connection.
• What conduit fitting size does it support? The main port is 3/4-14 NPT, and we include one matching plug. You can add your own fittings as needed.
• How do I verify the correct probe penetration? Use the 3.9 inch (suffix 039) specification as your target. Since the probe markings are not visible, measure from the housing face during setup.
• Are these units new or refurbished? We supply only new & original units in factory packaging. Each includes a 12-month factory warranty from Bently Nevada.
• Can I mount this housing without a standoff adapter? Yes, suffix -00 means no adapter, so you use the -02 mounting thread (3/4-14 NPT) directly into the machine port.

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