21000-34-00-30-039-03-02 | Bently Nevada 3.9 in Probe Penetration Housing Assembly

Introduction to the 21000-34-00-30-039-03-02 Proximity Probe Housing Assembly

When machinery protection demands precise and durable proximity sensing, the 21000-34-00-30-039-03-02 from Bently Nevada delivers a robust solution. This aluminum housing assembly with a 304 stainless steel sleeve is designed for externally mounted proximity probes in hazardous areas. It supports a 3300 XL 8 mm probe with connector protector, making it a key component for vibration monitoring in rotating equipment.

Key Features and Technical Specifications of the 21000-34-00-30-039-03-02

• Probe Option: 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals.
• Standoff Adapter: 3 inches (30 suffix).
• Probe Penetration: 3.9 inches (039 suffix).
• Mounting Thread: 3/4-14 NPT (-02 option).
• Fittings Included: 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 1/8 to 3/8 inches.
• Maximum Probe Cable Length (C+D): 32.9 inches (83.5 cm) with visible probe P/N and S/N.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Material: Aluminum body with 304 stainless steel sleeve.
• Enclosure Rating: CSA Type 4, explosion proof for hazardous areas, compliant with API 670 Standard.

One distinctive specification is the 3.9-inch probe penetration, which allows the sensor to reach deep into the machine casing for accurate proximity measurements. This feature is critical for applications where the target surface is recessed or behind obstructions.

Applications and Use Cases for the 21000-34-00-30-039-03-02

This housing assembly is ideal for monitoring shaft vibration and position in turbines, compressors, pumps, and motors. It is fully compliant with API 670, making it suitable for use in refineries and chemical plants. In addition, the CSA Type 4 and explosion-proof ratings enable deployment in hazardous environments where safety is paramount. For engineers upgrading from older probe housings, this model offers a standardized 3/4-14 NPT mounting thread and a robust stainless steel sleeve for extended service life.

Installation and Setup Guidance

Mount the housing using the 3/4-14 NPT thread and ensure the standoff adapter is properly torqued. The included fittings allow for flexible conduit connections. Verify that the probe cable length does not exceed the maximum C+D dimension of 32.9 inches. For hazardous area installations, follow all local codes and use the provided cable seal grip with the appropriate grommet for your cable diameter.

Maintenance and Reliability Tips

Periodically inspect the O-rings and thread seal for wear. Check the dome cover for tightness and ensure no moisture ingress. The aluminum body with stainless steel sleeve resists corrosion in harsh environments. Following a routine inspection schedule helps prevent unplanned downtime and extends the life of the assembly.

Compatibility and Integration

The 21000-34-00-30-039-03-02 is designed for use with Bently Nevada 3300 XL 8 mm proximity probes. It integrates seamlessly with Bently Nevada monitoring systems and is compatible with standard 3/4-14 NPT conduit fittings. For intrinsically safe applications, order the appropriate hazardous area approved probe.

Frequently Asked Questions about the 21000-34-00-30-039-03-02

What is the probe penetration length of the 21000-34-00-30-039-03-02?

The probe penetration is 3.9 inches (039 suffix).

What mounting thread does this housing use?

It uses a 3/4-14 NPT thread (-02 option).

Is the 21000-34-00-30-039-03-02 suitable for hazardous areas?

Yes, it is CSA Type 4 rated and explosion proof for hazardous areas.

What fittings are included with this assembly?

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 1/8 to 3/8 inches.

What is the weight of the 21000-34-00-30-039-03-02?

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

Product Support and Availability

The 21000-34-00-30-039-03-02 is available in new and original factory packaging from Petro Auto Tech. It comes with a 12-month factory warranty. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.