Product Overview – Pyramid Summary
- The Bently Nevada 21128-04-03 velocity transducer housing delivers rugged protection for vibration monitoring systems.
- Core Value: It protects sensors from hose-directed water, corrosion, and physical impact.
- Design Focus: Precision stainless steel construction supports long service life in non-hazardous areas.
Application & Compatibility
- The housing supports Velomitor sensors used in rotating equipment protection applications.
- The tall cap option allows proper installation of Velomitor CT sensors without mechanical stress.
- The design supports 9200 and 74712 Seismoprobes with isolated bases when correctly installed.
- Users must select cable part number 89477-AA for correct sensor-to-monitor connection.
Technical Specifications – Tree Structure
- Brand
- Bently Nevada
- Model
- 21128-04-03
- Category
- Water and corrosion-resistant velocity transducer housing
- Mounting & Threads
- Mounting option: 04 = 1/2-in 14 BSP (G 1/2-in)
- Internal thread: 1/2-in 20 UNF (21128 / CA21128)
- Cable Exit
- Option 03 = 1/2-in NPT explosion-proof cable grip fitting
- Outlet port size: 1/2-in NPT
- Environmental Ratings
- Temperature range: -29°C to +121°C (-20°F to +250°F)
- Moisture resistance: corrosion resistant, not submersible
- Physical Characteristics
- Weight: 1.6 kg (3.55 lb) without sensor or fittings
- O-ring material: Neoprene
Installation Guidelines
- Installers should tighten threaded connections evenly to maintain sealing integrity.
- Technicians must route cables carefully to avoid sharp bends and strain.
- Users should confirm thread compatibility before final installation.
Signal Integrity & Interference Resistance
- The stainless steel housing provides effective shielding against external interference.
- Proper grounding practices support stable and accurate vibration signals.
- Secure internal mounting reduces micro-movement that could affect measurement accuracy.
Packaging & Logistics
- The package includes one velocity transducer housing with integrated O-ring.
- Orders ship via FedEx, UPS, or DHL depending on destination requirements.
Frequently Asked Questions (FAQ)
- Which environments suit this housing best?
- The housing suits non-hazardous industrial environments with moisture and corrosion exposure.
- When should users select the tall cap option?
- Users must select the tall cap when installing a Velomitor CT sensor.
- Does this housing work with proximity probe systems?
- Applications using a 3300 XL 11mm Proximity Probe require dedicated probe housings.
- How should buyers choose mounting threads?
- Buyers should match housing threads with machine ports to simplify installation.
Contact Information & Support
- Email inquiries:
info@oiltechcontrols.com - WhatsApp support:
+86 158 8020 0923
- Copyright © 2026 Oiltech Controls Limited. All rights reserved.
- Original Source:
https://www.oiltechcontrols.com/ - Partner:
PLCDCS HUB Limited - Partner:
Powergear X Automation Limited - All rights reserved.
Michael Thompson –
This 21128-04-03 housing arrived brand new and well packaged. The stainless steel enclosure is very solid and provides excellent protection for our velocity transducer in a high-vibration pump application. Installation was straightforward and the fit was exactly as expected. We’re using it in a refinery environment where durability really matters, and it’s been performing reliably with no corrosion issues. The seller was very professional and responsive, and shipping was faster than expected for an industrial component. Overall, a dependable solution for critical vibration monitoring setups.