Bently Nevada 21128 Velocity Transducer Housing: Premium Protection
This sturdy housing safeguards velocity sensors 21128-11-01 from harsh conditions. It meets NEMA 4X and IP65 standards for reliable performance. The 21128-11-01 housing suits demanding industrial monitoring applications perfectly.
Core Features & Benefits
- Constructed from durable 303 stainless steel for excellent corrosion resistance.
- Provides robust protection against hose-directed water, physical impact, and adverse environments.
- Engineered to meet NEMA 4X and IP65 requirements when you install it correctly.
- Features a tall cap option for compatibility with the Velomitor CT sensor and specific Seismoprobe models.
- Offers reliable operation across a wide temperature range from -29°C to +121°C.
Technical Specifications
- Brand & Model: Bently Nevada 21128 Series
- Construction: 303 Stainless Steel
- Environmental Ratings: NEMA 4X, IP65 (when properly installed)
- Temperature Rating: -29°C to +121°C (-20°F to +250°F)
- Moisture Protection: Resists moisture and corrosion but is not submersible.
- Sealing: Neoprene O-ring
- Weight: 1.6 kg (3.55 lb) without sensor or fittings
Model Variants & Configuration
The model number 21128-11-01 includes suffix options for custom configuration.
- Mounting Thread & Cap (AA):
- 11: Unthreaded base, 28.5 mm diameter with tall cap
- Cable Exit Fitting (BB):
- 01: 1/2-in NPT plug
Installation & Compatibility Guide
- You must use the tall cap when installing a Velomitor CT sensor.
- The tall cap is also required for 9200 or 74712 Seismoprobe models with an isolated base.
- Use cable part number 89477-AA to connect the Velomitor sensor to a monitor inside this housing.
- For other sensor installations, consider our 3300 XL 11mm Proximity Probe options.
- The internal mounting thread for the 21128 is 1/2-in 20 UNF.
Frequently Asked Questions (FAQ)
- What is the main purpose of the Bently Nevada 21128 housing?
- It protects sensitive velocity transducers from water, corrosion, and physical damage in tough environments.
- Is this housing waterproof for submerged applications?
- No, it resists moisture and corrosion but is not designed for submersible use.
- When do I need to order the tall cap option?
- Always order the tall cap for Velomitor CT sensors or specific Seismoprobe models (9200/74712 with isolated base).
- What cable should I use with a Velomitor inside this housing?
- You need cable part number 89477-AA for a proper connection.
- How do I choose the right model suffix for my application?
- Select “11” for the unthreaded base with tall cap and “01” for the standard 1/2-in NPT plug exit.
Packaging & Shipping
- Each 21128 Velocity Transducer Housing ships as one complete unit.
- The package includes the housing body, cap with O-ring, and specified exit plug.
- We ship globally via reliable carriers like FedEx, UPS, and DHL.
For specific technical inquiries or compatibility checks, please contact us:
Email: info@oiltechcontrols.com
Phone/WhatsApp: +86 158 8020 0923
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Daniel Rivera –
We purchased the 21128-11-01 housing for an outdoor compressor monitoring project, and it exceeded expectations. The unit was brand new and clearly original. The NEMA 4X rating is critical for our washdown environment, and this enclosure has held up perfectly against moisture and dust. Customer service was professional and knowledgeable, helping confirm compatibility before ordering. Shipping was quick, which helped us avoid downtime during a scheduled maintenance window. We’ve already installed multiple units across the site and plan to reorder.