21000-34-00-20-039-03-02 | Bently Nevada 3.9 in Probe Penetration Housing Assembly

Introduction to the Bently Nevada 21000-34-00-20-039-03-02

When machinery protection demands a rugged and precise mounting solution, the 21000-34-00-20-039-03-02 delivers a proven design. This Bently Nevada proximity probe housing assembly is engineered for hazardous area applications. It combines an aluminum body with a 304 stainless steel sleeve. The assembly supports a 3300 XL 8 mm probe with connector protector. Engineers can rely on its selectable hazardous area approvals for intrinsically safe installations.

Key Features and Technical Specifications

• Probe Option: 3300 XL 8 mm probe with connector protector and selectable hazardous area approvals.
• Probe Cable Length: 1.0 m (not required for this suffix code).
• Standoff Adapter: 2 in length.
• Probe Penetration: 3.9 in.
• Mounting Thread: 3/4-14 NPT.
• 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.
• Material: Aluminum body with 304 stainless steel sleeve.
• Enclosure Rating: CSA Type 4, explosion proof for hazardous areas.

A distinctive spec is the 3.9 in probe penetration. This allows deep insertion into bearing housings or casings. It ensures accurate proximity measurements even in tight installations. The 2 in standoff adapter provides flexibility for mounting on various machine surfaces.

Industry Applications and Use Cases

The 21000-34-00-20-039-03-02 is ideal for rotating machinery monitoring. It is commonly used in turbines, compressors, and pumps. The housing meets API 670 Standard for externally mounted proximity probes. Therefore, it suits oil and gas, power generation, and petrochemical plants. Its CSA Type 4 enclosure protects against dust and water ingress. This makes it reliable in harsh outdoor or washdown environments.

Installation and Setup Guidance

Mounting the housing requires a 3/4-14 NPT threaded hole. The included fitting kit contains one 3/4-14 NPT plug and one reducer to 1/2-14 NPT. A cable seal grip with grommets accommodates cable sizes from 1/8 to 3/8 inches. Ensure the standoff adapter is properly torqued to avoid leakage. For hazardous areas, follow local electrical codes and the manufacturer's manual. Always verify the probe gap setting before final tightening.

Maintenance and Reliability Tips

Periodic inspection of the housing is recommended. Check for corrosion on the aluminum body and stainless steel sleeve. Verify that all conduit fittings remain tight. The O-rings should be inspected for cracks or wear. Replace them if any damage is found. This proactive care extends service life and prevents false alarms. The housing's robust construction minimizes maintenance intervals.

Compatibility and Integration

This housing is designed for the Bently Nevada 3300 XL 8 mm proximity probe. It works with Bently Nevada monitoring systems such as 3500 and 3300 racks. The assembly is fully compliant with API 670 standards. Therefore, it integrates seamlessly into existing vibration monitoring networks. For intrinsically safe applications, order the appropriate hazardous area approved probe.

Comparison with Similar Housing Assemblies

Compared to the 24701 stainless steel housing, the 21000 aluminum body is lighter (1.1 kg vs. heavier stainless steel). Both offer CSA Type 4 and explosion proof ratings. The 21000 series provides selectable hazardous area approvals, while the 24701 is typically used in more corrosive environments. The 21000-34-00-20-039-03-02 specifically includes a 2 in standoff adapter and 3.9 in probe penetration. Other suffix codes may offer different lengths. Always choose the correct penetration for your machine's clearance.

Frequently Asked Questions

Q: What probe is compatible with the 21000-34-00-20-039-03-02?

A: It accepts a 3300 XL 8 mm proximity probe with connector protector, including selectable hazardous area approvals.

Q: What is the mounting thread size?

A: The mounting thread is 3/4-14 NPT, which is standard for many industrial conduit connections.

Q: Is this housing suitable for hazardous areas?

A: Yes, it is CSA certified as explosion proof and can be used with intrinsically safe probes in hazardous locations.

Q: What is the maximum cable length for the probe?

A: The probe cable length is 1.0 m. The suffix code 00 indicates that a probe cable is not required separately.

Q: Does the housing meet API 670 standards?

A: Yes, the 21000 housing is fully compliant with the API 670 Standard for externally mounted proximity probe housings.

Product Support and Availability

The 21000-34-00-20-039-03-02 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 lead times. They can also help with selecting the correct probe and accessories for your application.