Bently Nevada 21128-04-01 Velocity Transducer Housing – Corrosion-Resistant Enclosure

Technical Specifications Breakdown

Key parameters for the 21128-04-01 are listed below for quick reference:

Industrial Applications and Cost Benefits

Water Jet Exposure in Washdown Areas

In food processing or chemical plants, high-pressure washdowns can damage unprotected velocity transducers. The 21128-04-01 housing prevents water ingress, avoiding sensor replacement costs that can exceed $500 per incident. Its 303 stainless steel construction resists corrosion, extending sensor life by up to three years in wet environments.

High-Temperature Machinery Monitoring

For steam turbines or compressors operating near 121°C, standard plastic housings degrade quickly. This housing withstands -29°C to +121°C, eliminating the need for frequent housing swaps. The neoprene O-ring maintains seal integrity across the temperature range, reducing maintenance labor costs.

Physical Abuse Protection in Mining

In mining operations, falling debris can crush exposed sensors. The rugged stainless steel housing absorbs impacts, cutting sensor damage rates by 40% based on field data. The 1/2-in NPT outlet port allows easy conduit connection, simplifying replacement and reducing installation time.

Installation and Setup Guidance

Mount the 21128-04-01 using the 1/2-in 14 BSP internal thread. Ensure the neoprene O-ring is seated properly before tightening. For the cable exit, use the supplied 1/2-in NPT plug or attach a conduit fitting. When installing a Velomitor CT, order the tall cap option. For 9200 or 74712 Seismoprobe sensors with isolated base, the tall cap is also required. Use cable part number 89477-AA to connect the Velomitor sensor to a monitor.

Maintenance and Reliability

Inspect the O-ring annually for cracks or compression set. Clean the housing exterior with mild detergent; avoid abrasive tools that could scratch the stainless steel surface. Verify that all fittings remain tight after thermal cycling. The housing is not submersible, so avoid immersion in liquids.

Cost-Effective Protection for Velocity Sensors

Industrial environments expose velocity sensors to water, corrosion, and physical abuse, leading to frequent replacements and costly downtime. The Bently Nevada 21128-04-01 velocity transducer housing provides a robust, cost-saving solution by shielding sensors from these hazards. Constructed from 303 stainless steel, this housing meets NEMA 4X and IP65 requirements when properly installed, ensuring long-term reliability and reducing total cost of ownership.

Selection Guide and Purchasing Advice

For non-hazardous environments, the 21128 housing is the standard choice. If explosion-proof certification is needed, select the CA21128 version with CSA approval. For BASEEFA-approved installations, use the BA42608 housing. The 21128-04-01 variant with 1/2-in 14 BSP thread fits most European-style sensors. Please verify current lifecycle status and availability with AutoDCSTech before ordering.