21000-34-00-20-030-03-02 | Bently Nevada 8 mm Proximity Probe Housing Assembly

Introduction to the 21000-34-00-20-030-03-02

When reliable vibration monitoring in hazardous environments is critical, the 21000-34-00-20-030-03-02 from Bently Nevada delivers a robust solution. This proximity probe housing assembly is part of the 21000 series, engineered for externally mounted probes in demanding industrial settings. It combines an aluminum body with a 304 stainless steel sleeve for durability and corrosion resistance.

Key Features and Technical Specifications

The 21000-34-00-20-030-03-02 includes a 3300 XL 8 mm probe with connector protector, selectable for hazardous area approvals. Its standoff adapter measures 2.0 inches, and the probe penetration is 3.0 inches. The assembly comes with 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. The mounting thread is 3/4-14 NPT. The probe cable length is 1.0 meter, with a maximum visible probe dimension of 17.0 inches (43.18 cm) and a maximum overall dimension of 32.9 inches (83.5 cm). Typical weight is 1.1 kg (2.4 lb) without fittings.

• Probe Type: 3300 XL 8 mm with connector protector
• Standoff Adapter: 2.0 inches
• Probe Penetration: 3.0 inches
• Mounting Thread: 3/4-14 NPT
• Probe Cable Length: 1.0 meter
• Maximum Dimension (C+D): 32.9 inches (83.5 cm)
• Weight: 1.1 kg (2.4 lb) typical
• Material: Aluminum body with 304 stainless steel sleeve

Applications and Use Cases

This housing assembly is ideal for monitoring rotating machinery such as turbines, compressors, and pumps in oil and gas, petrochemical, and power generation plants. Its explosion-proof rating makes it suitable for Class I, Division 1 hazardous areas. Additionally, it complies with the API 670 standard for externally mounted proximity probes, ensuring reliable performance in critical applications.

Installation and Setup

Mount the 21000-34-00-20-030-03-02 using the 3/4-14 NPT mounting thread. The standoff adapter and probe penetration are pre-configured to 2.0 inches and 3.0 inches, respectively. Use the provided conduit fittings and cable seal grip to secure the probe cable. Ensure the dome cover is tightened properly to maintain the CSA Type 4 enclosure rating. For intrinsically safe installations, pair with an approved barrier.

Maintenance and Reliability

Regularly inspect the housing for signs of corrosion or damage, especially in harsh environments. Verify that all seals and gaskets remain intact to preserve the explosion-proof integrity. The stainless steel sleeve provides long-term resistance to wear. Periodic cleaning of the probe tip with a soft cloth helps maintain measurement accuracy.

Compatibility and Integration

This assembly works with Bently Nevada 3300 XL 8 mm proximity probes and compatible monitoring systems. It is designed for use with standard vibration monitoring racks and can be integrated into existing plant control systems. The CSA Type 4 and explosion-proof approvals ensure compatibility with hazardous area installations.

Frequently Asked Questions

Q: What is the probe cable length for the 21000-34-00-20-030-03-02?

A: The probe cable length is 1.0 meter.

Q: What mounting thread does this housing use?

A: It uses a 3/4-14 NPT mounting thread.

Q: Is this housing suitable for hazardous areas?

A: Yes, it is rated explosion proof and CSA Type 4 for hazardous locations.

Q: What is the maximum overall dimension of the assembly?

A: The maximum dimension (C+D) is 32.9 inches (83.5 cm).

Q: What materials are used in the housing?

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

Product Support and Availability

The 21000-34-00-20-030-03-02 is available from Petro Auto Tech as a new, factory-sealed unit. It comes with a 12-month warranty. Contact Petro Auto Tech for current stock and lead times.