21128-01-02 Bently Nevada 21128 Velocity Transducer Housing

Introduction to Bently Nevada Velocity Transducer Housings

Bently Nevada velocity transducer housings protect sensitive sensors from harsh conditions. These durable enclosures prevent damage from water, corrosion, and physical impact. They ensure reliable performance in demanding industrial environments. The 21128 housing is a versatile choice for standard applications.

Core Protective Features

• Constructed from robust 303 stainless steel for long-term durability.
• Meets NEMA 4X and IP65 standards for water and dust resistance.
• Shields sensors from hose-directed water and corrosive elements.
• Provides excellent defense against physical abuse and environmental stress.
• Neoprene O-ring ensures a reliable seal against moisture ingress.

Model Variants and Suffix Details

• 21128: Standard housing for non-hazardous locations.
  • Suffix -01: Unthreaded base, 28.5 mm (1.125 in) diameter.
  • Suffix -02: 1/2-in NPT explosion-proof cable exit fitting.
• CA21128: CSA certified explosion-proof housing.
  • Approved for Classes I, II, III, Division 1, Groups B-G.
  • Must ship with a pre-installed CSA approved sensor.
• BA42608: BASEEFA-approved for BS EN 60079-14 compliance.
  • IEC 144 IP65 rating for environmental protection.
• Tall Cap Option: Required for Velomitor CT or Seismoprobe installations.

Key Technical Specifications

• Brand: Bently Nevada. Model: 21128.
• Outlet Port: 1/2-in NPT size for secure connections.
• Internal Mounting Thread: 1/2-in 20 UNF for 21128 and CA21128.
• Weight: 1.6 kg (3.55 lb) without sensor or fittings.
• Temperature Rating: -29°C to +121°C (-20°F to +250°F).
• Moisture Resistance: Protects against corrosion but not submersible.
• O-ring Material: Neoprene for effective sealing.

Installation Guidelines

• Use cable part number 89477-AA with 21128 housing for Velomitor sensors.
• Ensure proper mounting to maintain NEMA 4X and IP65 integrity.
• Select tall cap option when installing Velomitor CT or specific Seismoprobes.
• Verify all fittings are tight to prevent environmental contamination.

Packaging Contents

• One velocity transducer housing unit.
• Neoprene O-ring pre-installed.
• No sensors or cables included unless specified.
• Packaged securely for safe transport via FedEx, UPS, or DHL.

Frequently Asked Questions

• What is the main difference between the 21128 and CA21128 models?
  The CA21128 is explosion-proof and CSA certified for hazardous areas.
• When should I choose the tall cap option?
  It is necessary for Velomitor CT or Seismoprobe 9200/74712 with isolated base.
• Can this housing be fully submerged in water?
  No, it is moisture-resistant but not designed for submersion.
• What cable should I use with the 21128 housing?
  You need cable part number 89477-AA for proper connectivity.
• Is the housing compatible with all Bently Nevada sensors?
  Check specific model requirements, as some sensors need the tall cap.

For technical support or purchasing, contact sales@powergearx.com or call +86 18030005825.

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