21128-11-01 | Bently Nevada -29°C to +121°C Velocity Transducer Housing

What Makes the 21128-11-01 Essential for Harsh Environments?

When moisture, corrosion, or physical impact threatens your velocity sensors, the 21128-11-01 from Bently Nevada delivers robust protection. This velocity transducer housing is constructed from 303 stainless steel and meets NEMA 4X and IP65 requirements when properly installed. It is designed to safeguard sensors in demanding industrial settings, ensuring reliable operation and extended service life.

Key Features & Technical Specs of the 21128-11-01

• Temperature Rating: -29°C to +121°C (-20°F to +250°F), suitable for extreme thermal environments.
• Moisture Protection: Resistant to moisture and corrosion, but not submersible.
• O-ring Material: Neoprene ensures a secure seal against contaminants.
• Weight: 1.6 kg (3.55 lb) without sensor or fittings, lightweight for easy installation.
• Mounting Thread: Unthreaded base, 28.5 mm (1.125 in) diameter with tall cap.
• Cable Exit: 1/2-in NPT plug for flexible cable routing.
• Internal Mounting Thread: 1/2-in 20 UNF for secure sensor attachment.

The tall cap option accommodates Velomitor CT sensors or 9200/74712 Seismoprobe with isolated base. Cable part number 89477-AA is required to connect the Velomitor sensor to a monitor.

Real-World Applications for the 21128-11-01

Industries such as oil and gas, chemical processing, and power generation benefit from this housing. It protects velocity transducers in areas exposed to hose-directed water or corrosive atmospheres. By preventing physical damage and environmental ingress, the 21128-11-01 reduces unplanned downtime and maintenance costs.

Installation Guide for the 21128-11-01

Mount the housing on a stable surface using the unthreaded base. Ensure the 1/2-in NPT cable exit fitting is properly sealed. Insert the velocity sensor and secure it with the internal 1/2-in 20 UNF thread. Verify the neoprene O-ring is in place before closing the cap to maintain NEMA 4X/IP65 protection.

Maintenance & Reliability Tips

Inspect the housing periodically for signs of corrosion or seal wear. Replace the neoprene O-ring if damaged to preserve moisture resistance. The stainless steel construction withstands harsh conditions, but regular cleaning with a damp cloth helps maintain appearance and function. Follow manufacturer guidelines for sensor maintenance.

Compatible Systems & Integration

The 21128-11-01 works with Bently Nevada Velomitor CT sensors and 9200/74712 Seismoprobe sensors. It requires cable part number 89477-AA for Velomitor connections. This housing integrates seamlessly into existing monitoring systems, providing a standardized mounting solution.

FAQs About the 21128-11-01

Q: What is the temperature range for the 21128-11-01?

A: The housing operates from -29°C to +121°C (-20°F to +250°F).

Q: Is the 21128-11-01 submersible?

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

Q: What cable is needed for Velomitor sensors?

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

Q: Does the housing include a tall cap?

A: Yes, the 21128-11-01 includes a tall cap for Velomitor CT or isolated base Seismoprobe sensors.

Product Support & Availability

The 21128-11-01 is in stock and ready to ship from Petro Auto Tech. Contact our team for pricing and lead times. We ensure fast delivery to keep your operations running.