Bently Nevada 21000-34-00-20-018-03-02 Proximity Probe Housing Assembly

Technical Specifications Breakdown

Key parameters for the 21000-34-00-20-018-03-02 are listed below for quick reference:

Industry Applications

The 2.0 in standoff adapter and 1.8 in probe penetration allow precise positioning of the 3300 XL 8 mm probe relative to the shaft target. The aluminum body with 304 stainless steel sleeve provides corrosion resistance in wet or corrosive atmospheres, while the CSA Type 4 enclosure rating ensures protection against dust and water ingress. By using this housing, maintenance teams can reduce unplanned downtime by enabling continuous, accurate vibration monitoring.

Installation & Setup Guidance

Mount the assembly using the 3/4-14 NPT threaded port. Ensure the standoff adapter length (2.0 in) is appropriate for the machine casing thickness. The fitting option includes a 3/4-14 NPT plug, a 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with grommets for cable diameters between 1/8 and 3/8 inches. Select the correct grommet size to maintain the environmental seal. Tighten all fittings to manufacturer torque specifications to prevent leakage. Verify the probe tip gap according to the 3300 XL probe installation manual.

Maintenance & Reliability

Inspect the housing assembly periodically for signs of corrosion, loose fittings, or damage to the cable seal grip. The 304 stainless steel sleeve resists rust, but the aluminum body may require attention in highly acidic environments. Replace O-rings if the housing is disassembled for probe replacement. The assembly does not require routine lubrication or adjustment. Keeping the conduit connections sealed prevents moisture ingress that could affect probe performance.

Robust Protection for Critical Machinery Monitoring

In rotating machinery monitoring, the probe housing assembly is the first line of defense against environmental contaminants and mechanical damage. The Bently Nevada 21000-34-00-20-018-03-02 provides a rugged, sealed enclosure for the 3300 XL 8 mm proximity probe, ensuring reliable vibration and position measurements in harsh industrial environments. This assembly is engineered to meet API 670 standards for externally mounted proximity probe housings, making it a trusted choice for refineries, power plants, and chemical facilities.

Selection Guide & Purchasing Advice

When ordering, verify that the standoff adapter length and probe penetration match your machine geometry. The 21000-34-00-20-018-03-02 configuration is suited for applications requiring a 2.0 in standoff and 1.8 in probe penetration. If your installation requires a different standoff length, select the appropriate suffix code. AutoDCSTech stocks this assembly as new and original in factory packing, backed by a 12-month warranty. Please verify current lifecycle status and availability with AutoDCSTech before ordering.

Troubleshooting & Common Issues

If the proximity probe output is erratic, check the cable seal grip for damage and ensure the grommet is properly seated. Loose fittings can allow moisture to enter the housing, causing intermittent signals. Verify that the mounting thread (3/4-14 NPT) is fully engaged and sealed with thread sealant. If the probe does not reach the target, confirm the probe penetration (1.8 in) is correct for your installation. For persistent issues, consult the Bently Nevada 3300 XL probe documentation.