21128-14-03 | Bently Nevada 1.6 kg Velocity Transducer Housing

Introduction to the 21128-14-03 Velocity Transducer Housing

When harsh environmental conditions threaten the reliability of your velocity sensors, the 21128-14-03 from Bently Nevada provides a robust solution. Constructed from 303 stainless steel, this housing is engineered to meet NEMA 4X and IP65 requirements when properly installed, making it ideal for non-hazardous locations. With a weight of 1.6 kg (3.55 lb) and a temperature rating of -29°C to +121°C (-20°F to +250°F), it offers durable protection without compromising performance.

Key Features & Technical Specs

• Material: 303 stainless steel construction resists corrosion and physical abuse.
• Environmental Rating: Meets NEMA 4X and IP65 when properly installed.
• Temperature Range: Operates from -29°C to +121°C (-20°F to +250°F).
• Moisture Protection: Resistant to moisture and corrosion but not submersible.
• O-ring Material: Neoprene ensures a reliable seal.
• Mounting Thread: 1/2-in 14 BSP (G 1/2-in) with tall cap.
• Cable Exit: 1/2-in NPT explosion-proof and cable grip fittings.
• Weight: 1.6 kg (3.55 lb) without sensor or fittings.

Industry Applications & Use Cases

In industries such as oil and gas, petrochemical, and water treatment, velocity sensors are often exposed to hose-directed water, corrosive agents, and physical impacts. The 21128-14-03 housing mitigates these risks, extending sensor life and reducing maintenance costs. For example, in a refinery cooling tower, this housing protects vibration sensors from constant moisture and chemical exposure, ensuring continuous monitoring without frequent replacements.

Installation Guide

To install the 21128-14-03, first ensure the internal mounting thread (1/2-in 20 UNF for 21128 and CA21128 models) is clean and free of debris. Attach the velocity sensor securely, then thread the housing onto the mounting point using the 1/2-in 14 BSP thread. For cable connections, use the 1/2-in NPT outlet port with explosion-proof fittings. The tall cap option is required if installing a Velomitor CT or a 9200/74712 Seismoprobe with an isolated base. Always verify the O-ring is properly seated to maintain the IP65 seal.

Maintenance & Reliability

Regularly inspect the neoprene O-ring for wear or cracking, as it is critical for moisture resistance. Check the housing for signs of corrosion or physical damage, especially in harsh environments. The 303 stainless steel construction minimizes maintenance needs, but periodic cleaning with a damp cloth (avoiding abrasive solvents) helps maintain the NEMA 4X rating. For safety-rated installations, follow the manufacturer's manual for inspection intervals.

Compatibility & Integration

The 21128-14-03 is designed for use with Bently Nevada velocity sensors, including the Velomitor CT and 9200/74712 Seismoprobe. When using the 21128 housing, cable part number 89477-AA is necessary to connect the sensor to a monitor. For explosion-proof requirements, the CA21128 version is CSA certified for Classes I, II, III, Division 1, Groups B through G. The BA42608 housing is available for BASEEFA-approved installations requiring compliance with BS EN 60079 14.

FAQs about the 21128-14-03

Q: What is the temperature rating of the 21128-14-03?

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

Q: Is the 21128-14-03 submersible?

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

Q: What cable is needed with the 21128 housing?

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

Q: What is the weight of the 21128-14-03?

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

Q: What mounting thread does the 21128-14-03 use?

A: It uses a 1/2-in 14 BSP (G 1/2-in) mounting thread with a tall cap.

Product Support & Availability

The 21128-14-03 is in stock and ready to ship from Petro Auto Tech. Contact our team for pricing and lead times. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.