Bently Nevada 21128-02-03 Velocity Transducer Housing, NEMA 4X/IP65

Technical Specifications Breakdown

Key parameters for the 21128-02-03 are listed below for quick reference:

Industry Applications

Oil and Gas Facilities

In refineries and petrochemical plants, sensors face corrosive atmospheres and washdown procedures. The 21128-02-03 housing provides robust protection, ensuring velocity transducers remain operational in non-hazardous areas. For explosive environments, the CA21128 variant offers CSA certification for Classes I, II, III, Division 1, Groups B through G.

Water and Wastewater Treatment

Pump stations and treatment basins expose sensors to moisture and chemical splashes. This housing's NEMA 4X and IP65 ratings resist water ingress, while the 303 stainless steel construction withstands corrosion. The neoprene O-ring maintains a reliable seal over time.

Power Generation

Turbine monitoring in power plants demands sensors that survive high temperatures and physical impacts. With a temperature range of -29°C to +121°C, the housing protects velocity transducers in both indoor and outdoor installations. The 3/4-in NPT mounting thread simplifies integration into existing machinery.

Installation & Setup Guidance

Mount the 21128-02-03 housing using the 3/4-in 14 NPT thread to ensure a secure fit. The 1/2-in NPT cable exit accepts explosion-proof and cable grip fittings; use cable part number 89477-AA when connecting a Velomitor sensor to a monitor. For BASEEFA-approved installations (BA42608 housing), compliance with BS EN 60079-14 is required. Always verify that the O-ring is properly seated to maintain the IP65 seal.

Maintenance & Reliability

Inspect the housing periodically for signs of physical damage or corrosion. Check the neoprene O-ring for cracks or deformation and replace if necessary to preserve moisture resistance. Clean the exterior with mild detergent and water; avoid abrasive cleaners that could damage the stainless steel surface. The housing is not submersible, so avoid prolonged immersion.

Protective Enclosure for Velocity Sensors

The Bently Nevada 21128-02-03 is a velocity transducer housing designed to shield sensors from hose-directed water, corrosion, physical abuse, and other harsh environmental conditions. Constructed from 303 stainless steel, this housing meets NEMA 4X and IP65 requirements when properly installed, making it a reliable choice for industrial environments where sensor protection is critical.

Selection Guide & Purchasing Advice

When selecting a velocity transducer housing, consider the environmental classification of your site. For non-hazardous areas, the 21128-02-03 is the preferred choice. For explosive atmospheres, order the CA21128 with a CSA-approved sensor. For BASEEFA compliance, choose the BA42608. The tall cap option is available for Velomitor CT sensors or 9200/74712 Seismoprobe with isolated base. Contact AutoDCSTech for current lifecycle status and availability before ordering.

Compatibility & Integration

The 21128-02-03 housing is designed for use with Bently Nevada velocity sensors, including Velomitor and Seismoprobe models. When using the 21128 housing, cable part number 89477-AA is necessary to connect the Velomitor sensor to a monitor. The tall cap option accommodates Velomitor CT sensors and isolated-base 9200/74712 Seismoprobe units.