21128-02-01 | Bently Nevada 3/4-in NPT Velocity Transducer Housing

What Protects Your Velocity Sensors in Harsh Environments?

When moisture, corrosion, or physical abuse threatens sensor reliability, the 21128-02-01 from Bently Nevada delivers robust protection. This velocity transducer housing is constructed from 303 stainless steel and designed to meet NEMA 4X and IP65 requirements when properly installed. It safeguards velocity sensors from hose-directed water and adverse environmental conditions, making it a preferred choice for non-hazardous locations.

Key Features and Technical Specs of the 21128-02-01

• Mounting Thread: 3/4-in 14 NPT internal mounting thread for secure installation.
• Cable Exit Fitting: 1/2-in NPT plug for flexible cable routing.
• Temperature Rating: Operates from -29°C to +121°C (-20°F to +250°F).
• Moisture Resistance: Resists moisture and corrosion but is not submersible.
• O-ring Material: Neoprene ensures a reliable seal.
• Weight: 1.6 kg (3.55 lb) without sensor or fittings.
• Material: 303 stainless steel construction for durability.

A distinctive feature is the 3/4-in NPT mounting thread, which provides a robust connection for velocity sensors in industrial settings. This housing is part of the 21128 series, which also includes explosion-proof (CA21128) and BASEEFA-approved (BA42608) variants for hazardous environments.

Installation and Setup Guidance

For proper installation, ensure the housing is mounted securely using the 3/4-in 14 NPT thread. The 1/2-in NPT cable exit fitting accommodates standard conduit or cable glands. When using the 21128 housing with a Velomitor sensor, cable part number 89477-AA is required for connection to a monitor. For tall cap applications, such as installing a Velomitor CT or a 9200/74712 Seismoprobe with an isolated base, order the tall cap option separately.

Maintenance and Reliability Tips

Regularly inspect the neoprene O-ring for wear or damage to maintain the IP65 seal. Although the housing resists moisture and corrosion, avoid submersion. Periodic cleaning with a damp cloth and mild detergent helps preserve the 303 stainless steel finish. Following these steps extends service life and reduces replacement costs, aligning with a cost-benefit approach.

Compatibility and Integration

The 21128-02-01 is compatible with Bently Nevada velocity sensors, including the Velomitor series. For non-hazardous environments, it works directly with standard monitors using cable 89477-AA. For explosion-proof installations, use the CA21128 variant with CSA-approved sensors. The BA42608 housing supports BASEEFA-approved setups per BS EN 60079 14.

Frequently Asked Questions about the 21128-02-01

Q: What is the temperature range of the 21128-02-01 housing?

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

Q: Is the 21128-02-01 submersible?

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

Q: What material is the O-ring made of?

A: The O-ring is made of neoprene.

Q: What cable is needed to connect a Velomitor sensor to a monitor?

A: Cable part number 89477-AA is required.

Q: What is the weight of the 21128-02-01 housing?

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

Product Support and Availability

The 21128-02-01 is available from Petro Auto Tech. Please verify current lifecycle status and availability before ordering. In stock and ready to ship for your industrial automation needs.