21128 -02-01Velocity Transducer Housing Series
Bently Nevada 21128-02-01 MOD 148264-02 – rugged housing for velocity sensors. Shields against hose-directed water, corrosion, and physical abuse. Meets NEMA 4X and IP65 when installed correctly. Non-hazardous environments use the standard 21128. For explosive areas, choose the CSA-certified CA21128. BASEEFA-approved BA42608 complies with BS EN 60079 14. Tall cap option available for Velomitor CT, 9200, or 74712 Seismoprobe with isolated base.
Technical Specifications
| Brand | Bently Nevada |
| Model | 21128-02-01 MOD 148264-02 |
| Mounting Thread | 3/4-in 14 NPT |
| Cable Exit | 1/2-in NPT plug |
| Temperature Range | -29°C to +121°C (-20°F to +250°F) |
| Moisture Resistance | Resistant, not submersible |
| O-ring Material | Neoprene |
| Weight | 1.6 kg (3.55 lb) without sensor |
| Internal Mounting Thread (21128/CA21128) | 1/2-in 20 UNF |
| Internal Mounting Thread (BA42608) | 5/8-in 18 UNF-2B |
| Outlet Port | 1/2-in NPT |
Key Features & Compatibility
- Housing Options: 21128 (standard), CA21128 (explosion-proof CSA Class I,II,III Div1 Gr B-G), BA42608 (BASEEFA, IP65)
- Tall Cap: Required for Velomitor CT, 9200, or 74712 Seismoprobe with isolated base
- Cable: Use 89477-AA to connect Velomitor to monitor
- Frequency Response: Optimized for velocity sensors
- Sensitivity & Linearity: Depends on installed sensor
- Resolution: Sensor-dependent
- Environmental Protection: NEMA 4X, IP65, corrosion-resistant
- Interference Immunity: Robust against EMI/RFI
Installation & Maintenance
- Mounting: Use provided NPT threads. Apply sealant to prevent leakage.
- Orientation: Install upright for best drainage.
- Cable Connection: Route 89477-AA cable through 1/2-in NPT port.
- Testing: Verify continuity before operation.
- Maintenance: Inspect O-ring annually. Replace if cracked.
- Calibration: Perform with certified sensor per factory spec.
Diagnostics & Application
- Diagnostic Use: Monitors vibration on turbines, compressors, pumps.
- Typical Scenarios: Oil & gas, power generation, paper mills.
- Condition Monitoring: Interfaces with Bently Nevada monitors.
- Alarm Setpoints: Adjustable via monitor.
Certifications & Compliance
- CA21128: CSA certified Classes I,II,III Div1 Gr B-G
- BA42608: BASEEFA approved per BS EN 60079 14
- 21128: NEMA 4X, IP65 (when installed)
- Material: 303 stainless steel
What’s Included
- 21128 Housing assembly with 1/2-in NPT plug
- Neoprene O-ring (installed)
- Installation guide
- No sensor included (order separately)
12-Month Warranty
Oiltech Controls provides a full 12-month warranty against defects in material and workmanship. Covers replacement or repair. Does not cover misuse or unauthorized modification.
Shipping & Delivery
We ship via FedEx, UPS, and DHL worldwide. Tracking number provided. Most orders ship within 24 hours. Expedited options available.
Frequently Asked Questions
- Is this housing submersible? No, it resists moisture but is not submersible.
- Can I use this with a Velomitor CT? Yes, you need the tall cap option.
- What cable is required? Use Bently Nevada 89477-AA.
- Is sensor included? No, sensor must be ordered separately.
- Is this CSA approved? Only CA21128 version is CSA certified.
Why Buy From Oiltech Controls?
- Over 15 years in industrial automation spares
- Global shipping support – we deliver worldwide
- Tested industrial surplus and refurbished options
- 12-month warranty gives you peace of mind
- Technical verification performed before shipment
- We support obsolete control systems, including Modicon Quantum
Contact Inquiries: info@oiltechcontrols.com • +86 158 8020 0923
Copyright © 2026 Oiltech Controls Limited. All rights reserved.
Original Source: https://www.oiltechcontrols.com/
Reviews
There are no reviews yet.