Bently Nevada 21128-13-02 Velocity Transducer Housing for Harsh Environments

Technical Specifications Breakdown

Key parameters for the 21128-13-02 are listed below for quick reference:

Installation Guidance for Optimal Performance

Proper installation is critical to maintain the NEMA 4X and IP65 ratings. The housing uses a 1/2-in NPT cable exit fitting with an explosion-proof fitting option (part number 21128-13-02). For Velomitor sensors, cable part number 89477-AA is required to connect the sensor to a monitor. Ensure the O-ring (neoprene) is seated correctly and all threads are properly sealed to prevent moisture ingress. The internal mounting thread is 1/2-in 20 UNF for the 21128 and CA21128 models.

Maintenance and Reliability Considerations

While the housing is corrosion-resistant, periodic inspection is recommended. Check the neoprene O-ring for wear or deformation, and verify that all fittings remain tight. The unit is not submersible, so avoid prolonged immersion. Clean the exterior with mild detergents; do not use abrasive tools that could damage the stainless steel surface.

Robust Protection for Critical Velocity Measurements

Industrial environments expose vibration sensors to water, corrosion, and physical impact. The Bently Nevada 21128-13-02 Velocity Transducer Housing solves this challenge by providing a rugged enclosure that shields velocity sensors from hose-directed water, corrosive agents, and mechanical abuse. Constructed from 303 stainless steel, this housing meets NEMA 4X and IP65 requirements when properly installed, ensuring reliable operation in demanding non-hazardous conditions.

Engineered for Harsh Industrial Environments

This housing is purpose-built for applications where sensors face continuous moisture, washdowns, or corrosive atmospheres. Typical use cases include:

• Pump and compressor monitoring: Protects velocity transducers in areas with high humidity or occasional water spray.
• Paper and pulp mills: Resists corrosion from chemicals and moisture-laden air.
• Food and beverage processing: Withstands hose-directed cleaning without compromising sensor integrity.

The 21128-13-02 variant includes a tall cap, which is required when installing a Velomitor CT or a 9200/74712 Seismoprobe with isolated base. This ensures proper fitment and reliable signal transmission.

Compatibility and Integration Notes

The 21128-13-02 is designed for non-hazardous environments. For hazardous locations, the CA21128 explosion-proof version (CSA certified for Classes I, II, III, Division 1, Groups B-G) or the BA42608 BASEEFA-approved housing should be selected. These require a CSA-approved velocity sensor installed at the factory. Always verify the correct housing variant for your area classification.

Selection Guide and Purchasing Advice

When selecting the 21128-13-02, confirm your sensor type and cable requirements. The tall cap is mandatory for Velomitor CT or isolated-base Seismoprobe installations. AutoDCSTech stocks this housing and can advise on compatible sensors and accessories. Please verify current lifecycle status and availability with AutoDCSTech before ordering.