21000-34-10-00-039-03-02 | Bently Nevada 3.9 in Probe Penetration Housing

Introduction to the 21000-34-10-00-039-03-02

When a rotating machine demands precise vibration monitoring in a hazardous environment, the 21000-34-10-00-039-03-02 from Bently Nevada delivers a robust solution. This proximity probe housing assembly is engineered for external mounting per API 670 standards. It combines an aluminum body with a 304 stainless steel sleeve for durability. The assembly includes a 3300 XL 8 mm probe with connector protector. Engineers trust this model for its explosion-proof CSA certification and Type 4 enclosure rating.

Key Features and Technical Specs of the 21000-34-10-00-039-03-02

• Probe Option: 3300 XL 8 mm probe with connector protector and selectable hazardous area approvals.
• Probe Cable Length: 1.0 m (probe cable not required with this suffix).
• Probe Penetration: 039 = 3.9 in.
• Fitting Option: One 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and one cable seal grip with grommets for multiple cable sizes.
• Mounting Thread Option: 3/4-14 NPT (required when standoff adapter length is not -00).
• Material: Aluminum body with 304 stainless steel sleeve.
• Maximum (C) + (D) with visible probe P/N and S/N: 17.0 in (43.18 cm).
• Maximum (C) + (D) Dimension: 32.9 in (83.5 cm).
• Weight: 1.1 kg (2.4 lb) typical, without fittings.

A standout spec is the 3.9 in probe penetration, which allows the sensor to reach deep into the machine casing for accurate shaft vibration readings. This capability is critical for early fault detection in turbines and compressors.

Real-World Applications for the 21000-34-10-00-039-03-02

In petrochemical plants, the 21000-34-10-00-039-03-02 monitors vibration on large centrifugal compressors. Its CSA explosion-proof rating makes it suitable for Class I, Division 1 areas. Similarly, power generation facilities use this housing to protect probes on steam turbines. The API 670 compliance ensures consistent performance across the industry. Moreover, the aluminum and stainless steel construction resists corrosion in offshore environments.

Installation and Setup Guidance

Mount the 21000-34-10-00-039-03-02 using the 3/4-14 NPT thread option. Ensure the probe sleeve penetrates exactly 3.9 in into the machine. Secure the conduit fittings provided: one 3/4-14 NPT plug and one reducer. Use the included cable seal grip with the appropriate grommet for your cable diameter. Always follow the manufacturer's manual for torque specifications and wiring.

Maintenance and Reliability

Inspect the O-rings and thread seal periodically for wear. The 304 stainless steel sleeve resists corrosion, extending service life in harsh environments. Regular visual checks of the dome cover and conduit connections help maintain the explosion-proof integrity. This proactive care reduces unplanned downtime and supports long-term reliability.

Compatibility and Integration

The 21000-34-10-00-039-03-02 works with Bently Nevada monitoring systems that accept 8 mm proximity probes. It is compatible with standard 1.0 m probe cables. The assembly integrates easily into existing API 670-compliant installations. For system-specific compatibility, consult the Bently Nevada documentation.

Troubleshooting and Common Issues

If the probe signal is noisy, verify the cable seal grip is properly tightened and the grommet matches the cable diameter. A loose dome cover can allow moisture ingress, so check the O-ring condition. For intermittent readings, inspect the connector protector for damage. Always refer to the official manual for detailed diagnostics.

Frequently Asked Questions about the 21000-34-10-00-039-03-02

What is the probe penetration of the 21000-34-10-00-039-03-02?

The probe penetration is 3.9 in, as indicated by the suffix code 039.

What mounting thread does this housing use?

It uses a 3/4-14 NPT mounting thread, required when the standoff adapter option is not -00.

Is this housing suitable for hazardous areas?

Yes, it is CSA certified explosion proof and rated as a Type 4 enclosure for hazardous locations.

What materials are used in the construction?

The body is aluminum, and the sleeve is 304 stainless steel.

What fittings are included with the 21000-34-10-00-039-03-02?

It includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with grommets for cable sizes from 1/8 to 3/8 inches.

Product Support and Availability

The 21000-34-10-00-039-03-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for current lifecycle status and ordering details. We provide new, original factory-packed units with a 12-month warranty.