Product Overview
When machine vibration threatens uptime, the Bently Nevada 21000-34-00-20-030-04-02 Proximity Probe Housing Assembly provides a rugged, certified solution. This assembly houses a 3300 XL 8 mm probe and is designed for permanent installation in hazardous areas. With a CSA Type 4 enclosure rating and full compliance with API 670, the 21000-34-00-20-030-04-02 delivers reliable, repeatable measurements for critical rotating machinery.
Key Features
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Explosion-proof construction – CSA certified for hazardous locations.
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Aluminum body with 304 stainless steel sleeve – corrosion-resistant and durable.
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Selectable hazardous area approvals – flexible for various site requirements.
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Optional standoff adapter (2-inch) – allows proper probe positioning.
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3/4-14 NPT mounting thread – standard industrial connection.
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Visible probe P/N and S/N – simplifies identification and traceability.
Technical Specifications
| Specification |
Value |
| Probe Option |
3300 XL 8 mm probe with connector protector |
| Probe Cable Length |
Not required (suffix 00) |
| Standoff Adapter |
2 in (suffix 20) |
| Probe Penetration |
3 in (suffix 030) |
| Fitting Option |
One 3/4-14 NPT plug only (suffix 04) |
| Mounting Thread |
3/4-14 NPT (suffix -02) |
| Housing Material |
Aluminum body with 304 stainless steel sleeve |
| Maximum (C) + (D) with visible probe P/N and S/N |
17.0 in (43.18 cm) |
| Maximum (C) + (D) Dimension |
32.9 in (83.5 cm) |
| Weight (typical, without fittings) |
1.1 kg (2.4 lb) |
Industry Applications
In petrochemical plants, the 21000-34-00-20-030-04-02 monitors shaft vibration on compressors and pumps, helping prevent unplanned downtime. Power generation facilities use it on turbines and generators to ensure safe operation. The assembly's explosion-proof rating makes it ideal for oil and gas environments where flammable gases are present.
Installation & Setup Guidance
Mount the housing using the 3/4-14 NPT thread. Ensure the standoff adapter (2 in) and probe penetration (3 in) match your machine's dimensions. The probe cable is not required with this suffix, so connect the probe directly to an extension cable or proximitor. Tighten all fittings to prevent leakage and verify the probe tip gap per the manufacturer's instructions.
Maintenance & Reliability
This housing requires minimal maintenance. Periodically inspect the dome cover and O-rings for wear. Keep the conduit ports sealed to maintain the explosion-proof rating. The aluminum body resists corrosion, while the stainless steel sleeve protects the probe. Regular checks ensure long service life and reliable measurements.
Buying Guide
Before ordering, confirm that your system requires a 3300 XL 8 mm probe and that the standoff adapter and penetration lengths match your installation. This part number includes a 3/4-14 NPT plug and mounting thread. PLC Source PRO offers this new, factory-packed unit with a 12-month warranty. Contact our team if you need assistance with compatibility.