21128-11-03 | Bently Nevada Velocity Transducer Housing IP65

What Is the Bently Nevada 21128-11-03?

When harsh environmental conditions threaten the reliability of velocity sensors, the 21128-11-03 provides a robust solution. This Bently Nevada housing is constructed from 303 stainless steel to resist hose-directed water, corrosion, physical abuse, and other adverse conditions. It meets NEMA 4X and IP65 requirements when properly installed, making it a preferred choice for non-hazardous locations.

The housing is available with a tall cap option, which is required for installing a Velomitor CT or a 9200 or 74712 Seismoprobe with an isolated base. For connecting the Velomitor sensor to a monitor, cable part number 89477-AA is necessary.

Key Features and Technical Specs

• Material: 303 stainless steel for corrosion resistance.
• Temperature Rating: -29°C to +121°C (-20°F to +250°F).
• Moisture Protection: Resistant to moisture and corrosion but not submersible.
• O-ring Material: Neoprene for reliable sealing.
• Weight: 1.6 kg (3.55 lb) without sensor or fittings.
• Mounting Thread: Unthreaded base, 28.5 mm diameter with tall cap (option 11).
• Cable Exit: 1/2-inch NPT explosion-proof and cable grip fittings (option 03).
• Internal Mounting Thread: 1/2-inch 20 UNF for 21128 and CA21128 models.

One standout spec is the wide temperature range from -29°C to +121°C, ensuring reliable operation in both freezing and high-heat industrial settings.

Real-World Applications

The 21128-11-03 is ideal for machinery monitoring in industries such as oil and gas, power generation, and manufacturing. It protects velocity sensors in environments with wash-down procedures, outdoor exposure, or corrosive atmospheres. For example, in a petrochemical plant, this housing shields sensors from chemical splashes and weather, reducing downtime.

Installation and Setup

Installation requires proper mounting to meet NEMA 4X and IP65 standards. Use the unthreaded base with a 28.5 mm diameter opening, and secure the housing with the 1/2-inch NPT cable exit fittings. Ensure the O-ring is correctly seated to maintain moisture resistance. For Velomitor sensors, use cable 89477-AA to connect to the monitor.

Maintenance and Reliability

Routine inspection of the O-ring and cable fittings is recommended to preserve the IP65 seal. The 303 stainless steel construction resists corrosion, extending service life in harsh conditions. Regular checks for physical damage or moisture ingress help avoid sensor failure.

Compatibility and Integration

This housing is compatible with Bently Nevada Velomitor CT, 9200, and 74712 Seismoprobe sensors. The tall cap option is mandatory for Velomitor CT or isolated-base sensors. Cable 89477-AA is required for Velomitor connections.

Common Questions About the 21128-11-03

Q: What is the temperature rating of the 21128-11-03?

A: The housing is rated for -29°C to +121°C (-20°F to +250°F).

Q: Is the 21128-11-03 submersible?

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

Q: What cable is needed for a Velomitor sensor?

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

Q: What is the weight of the housing without sensor?

A: It weighs 1.6 kg (3.55 lb) without the velocity sensor or fittings.

Q: Does the housing require a tall cap for certain sensors?

A: Yes, the tall cap option is required for Velomitor CT or 9200/74712 Seismoprobe with isolated base.

Product Support and Availability

The Bently Nevada 21128-11-03 is in stock and ready to ship from Petro Auto Tech. Contact our team for pricing and delivery details.