Bently Nevada 21128-03-03 Protective Housing | Explosion-Proof Sensor Cover

Bently Nevada 21128-03-03 Velocity Transducer Housing

The 21128-03-03 housing shields velocity sensors from water, impact, and corrosion.
It uses 303 stainless steel and meets NEMA 4X and IP65 standards.
Ideal for long-term reliability in both safe and harsh environments.

• Manufacturer: Bently Nevada
• Part Number: 21128-03-03
• Material: 303 Stainless Steel
• Temperature Range: -29°C to +121°C (-20°F to +250°F)
• Weight: 1.6 kg (3.55 lb)
• Water Resistance: Moisture and corrosion resistant, not submersible
• O-ring: Neoprene, long-life seal
• Outlet Port: 1/2-in NPT
• Mounting Thread: 1/2-in 20 UNF (21128 / CA21128) | 5/8-in 18 UNF-2B (BA42608)

Ordering Structure

• 21128 – AA-BB
  • AA – Mounting Thread & Cap: 03 = 1/2-in 14 NPT
  • BB – Cable Exit Fitting: 03 = 1/2-in NPT explosion-proof, with cable grip fittings

Product Highlights

• Explosion-proof design certified for Classes I–III, Groups B–G.
• Compatible with Velomitor CT, 9200, and 74712 Seismoprobe sensors.
• Tall cap option supports isolated base installations.
• Corrosion-proof 303 steel extends product life in marine and chemical areas.
• Stable mechanical sealing ensures high-vibration reliability.
• Operating humidity: 0 – 95% RH, non-condensing.
• Shock limit: 50 g; Vibration limit: 10 g peak.

Installation & Use

• Install using the correct NPT or UNF thread size per model type.
• Ensure the neoprene O-ring is seated firmly before tightening.
• Use cable 89477-AA to connect Velomitor sensors to monitors.
• Check sealing and torque regularly for maximum protection.

Packaging & Delivery

• Includes one stainless housing, O-ring, cable plug, and mounting hardware.
• Packed for vibration and moisture resistance.
• Ships worldwide via FedEx, UPS, or DHL.
• Standard delivery within 7–10 business days.

Warranty

• All Bently Nevada 21128-03-03 housings carry a 12-month limited warranty.
• Warranty covers manufacturing defects under normal operating conditions.

FAQ

• Q:
  Can I mount the housing outdoors in heavy rain?
  A:
  Yes. It meets IP65 and NEMA 4X, but avoid full immersion.
• Q:
  Which cable should I use for Velomitor sensors?
  A:
  Use cable 89477-AA for best connection and monitoring signal quality.
• Q:
  What is the difference between 21128 and CA21128?
  A:
  The CA21128 is explosion-proof, while 21128 suits normal conditions.
• Q:
  How can I ensure a proper seal during installation?
  A:
  Clean surfaces, seat the O-ring evenly, and tighten fittings firmly.
• Q:
  Does the housing need periodic maintenance?
  A:
  Check threads, inspect O-rings, and clean after exposure to oil or dust.

Contact & Support

• Email: sales@powergearx.com
• WhatsApp: +86 18030005825

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