21000-34-00-00-018-04-02 | Bently Nevada 8 mm Probe Housing Assembly

Introduction to the Bently Nevada 21000-34-00-00-018-04-02

When you need reliable vibration monitoring in hazardous environments, the 21000-34-00-00-018-04-02 from Bently Nevada delivers a robust solution. This proximity probe housing assembly is part of the 21000 series and is engineered for externally mounted probes. It combines an aluminum body with a 304 stainless steel sleeve for durability. The assembly includes a dome cover, threaded conduit ports, a probe sleeve, O-rings, a reverse mount proximity probe, and a thread seal. Optional conduit fittings and a standoff adapter are available. This model is CSA certified as explosion proof for hazardous areas and meets CSA Type 4 enclosure standards. It also complies with the API 670 Standard for externally mounted proximity probe housings.

Key Features and Technical Specifications of the 21000-34-00-00-018-04-02

• Probe Option: 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals.
• Probe Cable Length: 0.5 m (probe cable not included).
• Probe Penetration: 018 = 1.83.9 in (note: verify exact dimension with datasheet).
• Fitting Option: One 3/4-14 NPT plug only.
• Mounting Thread: 3/4-14 NPT (required when standoff adapter length option is not -00).
• Material: Aluminum body with 304 stainless steel sleeve.
• Maximum (C) + (D) Dimension: 13.5 in (34.3 cm).
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Approvals: CSA explosion proof, CSA Type 4 enclosure, API 670 compliant.

A standout feature is the selectable hazardous area approval for the 8 mm probe. This allows you to use the assembly in intrinsically safe applications without additional modifications. The assembly is designed for reverse mount probes, making it ideal for tight spaces where direct mounting is not possible.

Applications and Use Cases

The 21000-34-00-00-018-04-02 is commonly used in rotating machinery monitoring, such as turbines, compressors, and pumps. Its CSA explosion-proof rating makes it suitable for oil and gas refineries, chemical plants, and other hazardous environments. The assembly also meets API 670 standards, ensuring compatibility with industry-standard vibration monitoring systems. For example, in a refinery, this housing protects the probe from harsh conditions while providing accurate shaft vibration data.

Installation and Setup

Mount the assembly using the 3/4-14 NPT thread. Ensure the probe penetration depth matches your application (018 = 1.83.9 in). Use the provided 3/4-14 NPT plug for the fitting. If you need a standoff adapter, order the appropriate option separately. The probe cable is not included, so plan for a 0.5 m cable run. Always follow Bently Nevada's installation manual for torque specifications and wiring guidelines.

Maintenance and Reliability

Regularly inspect the O-rings and thread seal for wear. Check the dome cover for tightness and the probe sleeve for corrosion. The aluminum and stainless steel construction resists environmental damage, but periodic cleaning with a dry cloth is recommended. Because this assembly is used in safety-critical applications, follow the manufacturer's maintenance schedule to ensure long-term reliability.

Compatibility and Integration

The 21000-34-00-00-018-04-02 works with Bently Nevada 3300 XL 8 mm proximity probes and compatible monitoring systems. It is designed for external mounting per API 670 guidelines. For integration, ensure your system supports the probe's output and the housing's mounting configuration. Consult Bently Nevada's documentation for a list of compatible monitors and cables.

Troubleshooting and Common Issues

If the probe does not fit properly, verify the penetration depth and mounting thread. A loose dome cover may cause vibration noise. Check the O-rings for damage if moisture enters the housing. For electrical issues, inspect the connector and cable for breaks. Always refer to the official Bently Nevada troubleshooting guide for detailed steps.

FAQ about the 21000-34-00-00-018-04-02

Q: What is the probe option for the 21000-34-00-00-018-04-02?

A: It includes a 3300 XL 8 mm probe with connector protector and selectable hazardous area approvals.

Q: What is the mounting thread size?

A: The mounting thread is 3/4-14 NPT.

Q: Is the housing explosion proof?

A: Yes, the CSA version is rated explosion proof when ordered with specific options (E:00, E:01, E:02, or E:04).

Q: What is the weight of the assembly?

A: The typical weight is 1.1 kg (2.4 lb) without fittings.

Q: What materials are used in the housing?

A: The body is aluminum with a 304 stainless steel sleeve.

Product Support and Availability

The Bently Nevada 21000-34-00-00-018-04-02 is available as new and original in factory packing from Petro Auto Tech. It comes with a 12-month factory warranty. Contact Petro Auto Tech for current stock levels and ordering details.