21128-12-03 | Bently Nevada 1/2-in NPT Velocity Transducer Housing

Product Overview: Bently Nevada 21128-12-03 Velocity Transducer Housing

When environmental protection is critical for your velocity sensors, the 21128-12-03 from Bently Nevada delivers robust defense against water, corrosion, and physical abuse. This housing is constructed from 303 stainless steel and meets NEMA 4X and IP65 requirements when properly installed. With a mounting thread of 3/4-in 14 NPT and a tall cap option, it accommodates Velomitor CT sensors and specific Seismoprobe models. The 1/2-in NPT cable exit fitting with explosion-proof and cable grip fittings ensures secure connections in demanding industrial environments.

Key Features & Technical Specs of the 21128-12-03

• Mounting Thread: 3/4-in 14 NPT with tall cap for versatile installation.
• Cable Exit: 1/2-in NPT, explosion-proof and cable grip fittings included.
• Temperature Rating: -29°C to +121°C (-20°F to +250°F) for wide operating range.
• Moisture Resistance: Resistant to moisture and corrosion but not submersible.
• O-ring Material: Neoprene ensures reliable sealing.
• Weight: 1.6 kg (3.55 lb) without sensor or fittings.
• Internal Mounting Thread: 1/2-in 20 UNF for 21128 and CA21128 models.
• Outlet Port Size: 1/2-in NPT for standard cable connections.

One distinctive spec is the tall cap option, which is required for installing a Velomitor CT or certain Seismoprobe models. This feature expands the housing's compatibility, making it a flexible choice for various velocity sensor configurations.

Real-World Applications for the 21128-12-03

In industrial settings where sensors face hose-directed water or corrosive environments, the 21128-12-03 provides essential protection. It is preferred for non-hazardous conditions but also supports explosion-proof versions like the CA21128 for hazardous areas. Use it in manufacturing plants, refineries, or water treatment facilities to safeguard velocity transducers and ensure reliable monitoring.

Installation Guide for the Bently Nevada 21128-12-03

Install the housing by threading it onto the sensor using the 3/4-in 14 NPT mounting thread. Ensure the O-ring is properly seated to maintain the IP65 seal. For the 21128-12-03, use cable part number 89477-AA to connect the Velomitor sensor to a monitor. Verify the cable exit fitting is tightened to prevent moisture ingress. Always follow the manufacturer's manual for torque specifications and wiring details.

Maintenance & Reliability Tips

Inspect the O-ring periodically for wear or damage to maintain the environmental seal. Clean the exterior with a damp cloth to remove corrosive residues. Check the cable grip fittings for tightness after any temperature cycling. Regular inspection helps extend the housing's service life and prevents sensor damage.

Compatibility & Integration

The 21128-12-03 is designed for use with Bently Nevada velocity sensors such as the Velomitor CT. It requires cable part number 89477-AA for sensor-to-monitor connections. The housing is compatible with standard 1/2-in NPT cable fittings and supports both non-hazardous and explosion-proof installations when paired with the appropriate sensor.

Frequently Asked Questions about the 21128-12-03

What is the temperature rating of the 21128-12-03?

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

Is the 21128-12-03 submersible?

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

What cable is needed for the 21128-12-03?

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

What is the weight of the 21128-12-03?

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

Product Support & Availability

The 21128-12-03 is in stock and ready to ship. Contact Petro Auto Tech for pricing and availability. Please verify current lifecycle status with Petro Auto Tech before ordering.