When bearing vibration or shaft displacement threatens uptime in rotating machinery, the Bently Nevada 21000-34-00-20-039-04-02 Proximity Probe Housing Assembly delivers reliable, continuous monitoring. This new and original unit, supplied in factory packing, is engineered for harsh industrial environments and complies with the American Petroleum Institute's (API) 670 Standard for externally mounted proximity probe housings.
Product Overview
The Bently Nevada 21000-34-00-20-039-04-02 is a precision-machined housing assembly designed to protect and position a 3300 XL 8 mm proximity probe. It features an aluminum body with a 304 stainless steel sleeve, ensuring durability and corrosion resistance. The assembly includes a dome cover, threaded conduit ports, an optional-length probe sleeve, O-rings, a reverse mount probe, a thread seal, and optional conduit fittings. This configuration comes with a standoff adapter of 2.0 inches, a probe penetration of 3.9 inches, and a single 3/4-14 NPT plug. The mounting thread is 3/4-14 NPT, and the probe cable length is 1.0 meter.
Key Technical Specifications
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Model: 21000-34-00-20-039-04-02
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Probe Option: 3300 XL 8 mm probe with connector protector (selectable hazardous area approvals)
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Probe Cable Length: 1.0 m
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Standoff Adapter: 2.0 in
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Probe Penetration: 3.9 in
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Fitting Option: One 3/4-14 NPT plug only
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Mounting Thread: 3/4-14 NPT
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Material: Aluminum body with 304 stainless steel sleeve
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Maximum (C)+(D) with visible probe (P/N and S/N): 17.0 in (43.18 cm)
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Maximum (C)+(D) Dimension: 32.9 in (83.5 cm)
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Weight: 1.1 kg (2.4 lb) typical, without fittings
Industry Applications
This housing assembly is ideal for monitoring vibration and displacement in critical rotating equipment such as turbines, compressors, pumps, and motors. In a typical turbomachinery train, the Bently Nevada 21000-34-00-20-039-04-02 mounts externally on the bearing housing, providing a secure, repeatable probe position. Its CSA Type 4 enclosure rating makes it suitable for outdoor and wash-down environments, while the explosion-proof certification (when ordered with appropriate options) allows installation in hazardous areas. The API 670 compliance ensures it meets the stringent requirements of the oil and gas industry, making it a preferred choice for refinery and petrochemical applications.
Installation and Setup
Proper installation is critical for accurate readings. Mount the housing using the 3/4-14 NPT thread, ensuring a tight seal to prevent contamination. The standoff adapter (2.0 in) positions the probe at the correct distance from the shaft. Verify the probe penetration (3.9 in) matches the required gap. Connect the 1.0 m cable to the monitor, and check that the probe tip is clean and free of debris. Always follow the manufacturer's guidelines for torque and gap settings to achieve optimal performance.
Maintenance and Reliability
Regular inspection of the housing and probe is essential for long-term reliability. Check the O-rings and thread seal for wear, and tighten any loose fittings. Clean the probe tip periodically to prevent buildup that could affect readings. The aluminum housing with 304 stainless steel sleeve resists corrosion, reducing maintenance frequency. By investing in this durable assembly, you minimize downtime and extend the service life of your monitoring system, delivering a strong return on investment.
Selection Guide and Purchasing Advice
Before ordering, confirm that the configuration matches your application requirements: probe length, standoff, penetration, and fitting options. Verify the mounting thread compatibility with your existing hardware. For hazardous area installations, ensure you select the appropriate explosion-proof options. PLC Source PRO is a reliable supplier of new, original Bently Nevada components, backed by a 12-month factory warranty. Contact us to discuss your specific needs.