Bently Nevada 21128-02-02 Velocity Transducer Housing: NEMA 4X & IP65 Protection

Technical Specifications Breakdown

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

Industry Applications

This housing is engineered for environments where hose-directed water, corrosive agents, or physical impact threaten sensor integrity. Typical applications include:

• Pulp and Paper Mills: Protects velocity transducers on rotating machinery from washdown water and chemical exposure.
• Water and Wastewater Treatment: Shields sensors in humid, splash-prone areas around pumps and blowers.
• Mining and Mineral Processing: Guards against dust, moisture, and mechanical abrasion in crushers and conveyors.

Choosing the right housing prevents costly sensor failures and unplanned downtime.

Installation & Setup Guidance

Proper installation is critical to achieve the NEMA 4X and IP65 ratings. Follow these steps:

1. Mounting: Use the 3/4-in 14 NPT mounting thread to secure the housing to a rigid structure. Ensure the mating surface is clean and free of debris.
2. Cable Exit: The 1/2-in NPT explosion-proof fitting must be correctly torqued to maintain the seal. Use approved conduit or cable glands.
3. O-ring Care: The neoprene O-ring provides the environmental seal. Inspect it for cuts or deformation before each installation. Replace if damaged.
4. Sensor Installation: For the 21128 housing, use the 1/2-in 20 UNF internal thread. When installing a Velomitor CT, order the tall cap option. The same tall cap is required for 9200 or 74712 Seismoprobe sensors with isolated bases.
5. Cabling: When using the 21128 housing with a Velomitor sensor, cable part number 89477-AA is necessary to connect to a monitor.

Maintenance & Reliability

Regular inspection ensures long-term protection. Check the housing quarterly for:

• O-ring condition: Look for cracks, hardening, or compression set. Replace neoprene O-rings annually or sooner if exposed to extreme temperatures.
• Fitting tightness: Verify the cable exit fitting and mounting threads remain secure. Vibration can loosen connections over time.
• Surface integrity: Examine the 303 stainless steel for pitting or corrosion, especially in chloride-rich environments.

The housing is designed for non-submersible applications. Avoid immersion in water or process fluids.

Robust Protection for Critical Velocity Sensors

Industrial environments expose velocity sensors to water, corrosion, and physical abuse. The Bently Nevada 21128-02-02 velocity transducer housing provides a durable shield, ensuring reliable operation in demanding conditions.

Compatibility & Integration

This housing is compatible with Bently Nevada velocity sensors such as the Velomitor and Seismoprobe series. For hazardous locations, the explosion-proof version CA21128 is CSA certified for Classes I, II, III, Division 1, Groups B through G. The BA42608 housing supports BASEEFA-approved installations per BS EN 60079-14. Always verify sensor compatibility with the internal mounting thread and cap option before ordering.

Selection Guide & Purchasing Advice

When selecting a velocity transducer housing, consider the environmental conditions and required certifications. For explosive atmospheres, choose the CA21128 or BA42608 variants. AutoDCSTech stocks this housing and can advise on the correct configuration for your application. Please verify current lifecycle status and availability with AutoDCSTech before ordering.