21128-13-02 | Bently Nevada 1/2-in NPT Velocity Transducer Housing

What Is the Bently Nevada 21128-13-02?

When harsh environmental conditions threaten the reliability of your velocity sensors, the 21128-13-02 provides a robust solution. This Bently Nevada housing is constructed from 303 stainless steel and is designed to meet NEMA 4X and IP65 requirements when properly installed. It protects sensors from hose-directed water, corrosion, physical abuse, and other adverse conditions.

The 21128-13-02 variant includes a 1/2-in 14 NPT mounting thread with a tall cap and a 1/2-in NPT explosion-proof cable exit fitting. This configuration is ideal for non-hazardous locations where environmental protection is critical.

Key Features & Technical Specs

• Mounting Thread: 1/2-in 14 NPT with tall cap for versatile installation.
• Cable Exit: 1/2-in NPT explosion-proof fitting for secure cable routing.
• Temperature Rating: -29°C to +121°C (-20°F to +250°F) for extreme environments.
• Moisture Protection: Resistant to moisture and corrosion, but not submersible.
• O-ring Material: Neoprene ensures a reliable seal.
• Weight: 1.6 kg (3.55 lb) without sensor or fittings.
• Outlet Port Size: 1/2-in NPT for standard connections.

The 21128-13-02 is part of the 21128 housing family, which is preferred for most non-hazardous conditions. For explosion-proof needs, the CA21128 version is available.

Real-World Applications

This housing is commonly used in industrial environments where velocity sensors must withstand moisture, corrosion, and physical impact. For example, it is suitable for monitoring machinery in pulp and paper mills, chemical processing plants, and offshore platforms. Its IP65 rating ensures protection against water jets, while the stainless steel construction resists corrosion from harsh chemicals.

Because the 21128-13-02 is designed for non-hazardous areas, it is a cost-effective choice for facilities that do not require explosion-proof certification. However, if your application demands CSA certification, consider the CA21128 version.

Installation & Setup

Installing the 21128-13-02 is straightforward. First, mount the housing using the 1/2-in 14 NPT thread. Then, route the sensor cable through the 1/2-in NPT explosion-proof fitting. Ensure the O-ring is properly seated to maintain the IP65 seal. Finally, verify that the tall cap is securely fastened to protect the sensor.

When using the 21128 housing, cable part number 89477-AA is required to connect the Velomitor sensor to a monitor. Always follow the manufacturer's guidelines for torque specifications and wiring.

Maintenance & Reliability

Regular inspection of the O-ring and cable fitting is recommended to maintain the IP65 seal. Check for signs of corrosion or damage to the stainless steel housing, especially in aggressive environments. The neoprene O-ring should be replaced if it shows wear or compression set.

Because the housing is not submersible, avoid installing it in areas prone to flooding. Periodic cleaning with a damp cloth is sufficient to remove surface contaminants. This low-maintenance design reduces downtime and extends the life of your velocity sensor.

Compatibility & Integration

The 21128-13-02 is compatible with Bently Nevada velocity sensors such as the Velomitor CT, 9200, and 74712 Seismoprobe. The tall cap option is required when installing a Velomitor CT or a 9200/74712 Seismoprobe with an isolated base. For standard sensors, the standard cap may be used.

This housing integrates seamlessly with Bently Nevada monitoring systems using cable 89477-AA. It is designed for non-hazardous environments; for hazardous locations, use the CA21128 or BA42608 versions.

FAQs about the 21128-13-02

What is the temperature rating of the 21128-13-02?

The temperature rating is -29°C to +121°C (-20°F to +250°F).

Is the 21128-13-02 submersible?

No, it is resistant to moisture and corrosion but is not submersible.

What cable is needed for the 21128 housing?

Cable part number 89477-AA is necessary to connect the Velomitor sensor to a monitor.

What is the weight of the 21128-13-02?

The weight is 1.6 kg (3.55 lb) without the velocity sensor or fittings.

What is the mounting thread size?

The mounting thread is 1/2-in 14 NPT with a tall cap.

Product Support & Availability

The Bently Nevada 21128-13-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for pricing and lead times. We are your trusted source for industrial automation parts.