Technical Specifications Breakdown
Key parameters for the 21128-03-02 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Material | 303 stainless steel |
| Mounting Thread | 1/2-in 14 NPT (option 03) |
| Cable Exit Fitting | 1/2-in NPT, explosion-proof (option 02) |
| Temperature Rating | -29°C to +121°C (-20°F to +250°F) |
| Moisture Protection | Resistant to moisture and corrosion; not submersible |
| O-ring Material | Neoprene |
| Weight | 1.6 kg (3.55 lb) without sensor or fittings |
| Environmental Rating | NEMA 4X / IP65 (when properly installed) |
Application Scenarios for the 21128-03-02
This housing is preferred for non-hazardous locations where moisture and corrosion resistance are critical. Typical uses include:
- Pump and compressor monitoring: Protects velocity transducers from water spray and chemical exposure in process plants.
- Turbine vibration sensing: Shields sensors from physical abuse and environmental contaminants in power generation.

Installation Guidance
Proper installation ensures the NEMA 4X/IP65 seal. Use the 1/2-in NPT mounting thread (option 03) for secure attachment. The cable exit fitting (option 02) is explosion-proof for added safety. When using a Velomitor sensor, cable part number 89477-AA is required to connect to the monitor. For Velomitor CT or Seismoprobe sensors with isolated base, the tall cap option is necessary. Always follow manufacturer guidelines for torque and sealing.
Maintenance and Reliability
Inspect the neoprene O-ring periodically for cracks or deformation. Clean the housing exterior with mild detergent; avoid abrasive cleaners. Verify that all fittings remain tight to maintain the IP65 seal. The 303 stainless steel construction resists corrosion, but regular visual checks are recommended in aggressive environments.
Robust Protection for Velocity Sensors in Harsh Conditions
Industrial environments expose velocity sensors to water spray, corrosive agents, and physical impact. The Bently Nevada 21128-03-02 provides a durable 303 stainless steel enclosure designed to meet NEMA 4X and IP65 requirements when properly installed. This housing shields sensors from hose-directed water, corrosion, and physical abuse, ensuring reliable operation in demanding settings.

Selection Guide and Purchasing Advice
Choose the 21128-03-02 for standard non-hazardous applications requiring robust environmental protection. For explosion-proof needs, order the CA21128 with a CSA-approved sensor. For BASEEFA-approved installations, use the BA42608 housing. Contact AutoDCSTech to verify lifecycle status and availability before ordering. We stock genuine Bently Nevada parts to support your critical machinery monitoring systems.
Availability & Condition at AutoDCSTech
| Part Number | 21128-03-02 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
