Technical specifications

• Brand: Bently Nevada
• Model: 21000 Proximity Probe Housing Assemblies
• Part Number: 21000-34-05-00-028-04-02
• Material: Aluminum body with 304 stainless steel sleeve
• Weight: 1.1 kg (2.4 lb) typical, without fittings
• Enclosure Rating: CSA Type 4, explosion-proof for hazardous areas
• Compliance: API 670 Standard for externally mounted proximity probe housings

Complete suffix configuration

• 34 – Probe Option: 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals
• 05 – Probe Cable Length: 0.5 m (20 in)
• 00 – Standoff Adapter: None
• 028 – Probe Penetration: 2.8 in
• 04 – Fitting Option: One 3/4-14 NPT plug only
• -02 – Mounting Thread: 3/4-14 NPT (required when standoff adapter is not -00)

Probe performance specifications

The included 3300 XL 8 mm probe delivers precision measurements for vibration and position monitoring.

• Sensitivity: 200 mV/mil (7.87 V/mm) nominal
• Linear Range: 2 mm (80 mils) from 0.25 mm to 2.3 mm gap
• Linearity Deviation: ≤ ±6 mils (±0.15 µm)
• Frequency Response: 0 to 10 kHz
• Resolution: Infinite analog output with noise floor below 3 µm
• Interchangeability Error: Within 5%

Temperature range

• 3300 XL 8mm Probe Operating and Storage: –51°C to +177°C (–60°F to +351°F)
• 3300 XL 11mm Probe Operating and Storage: –51°C to +177°C (–60°F to +351°F)
• 3300 NSv Probe Operating: –34°C to +177°C (–30°F to +351°F)
• 3300 NSv Probe Storage: –51°C to +177°C (–60°F to +351°F)

Enclosure & environmental protection

• CSA certified explosion-proof for hazardous areas
• Suitable for intrinsically safe applications with approved probes
• CSA Type 4 enclosure protects against dust and water ingress
• Stainless steel sleeve resists corrosion in harsh process environments
• Integrated EMI/RFI shielding ensures high noise immunity

Frequently asked questions

• Can I use an 11 mm probe with this housing? Yes – the 21000 body accepts 3300 XL 11 mm probes. Order with the appropriate suffix code for 11 mm probe options.
• What is the maximum extension cable length? The standard probe cable is 0.5 m. You can extend up to 10 meters using Bently Nevada extension cables without signal degradation.
• Does this housing include the probe? Yes – this assembly comes complete with the reverse-mount 3300 XL 8 mm probe installed, as specified by suffix 34.
• Is this unit suitable for ATEX environments? This assembly carries CSA approval. For ATEX certification, please contact us to verify probe suffix compatibility.
• What tools do I need for installation? You need a strap wrench for the dome cover and standard wrenches for NPT fittings.
• Can I rotate the conduit entry after installation? With fitting option 04 (single plug), conduit entry orientation is fixed during installation. Plan your conduit placement accordingly.
• What does no standoff adapter (00) mean? The housing mounts directly without an extension, providing a shorter overall profile for tight spaces.

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