21000-34-00-20-095-03-02 | Bently Nevada 8 mm Probe Housing Assembly

What Is the 21000-34-00-20-095-03-02?

When industrial machinery demands precise vibration monitoring in hazardous environments, the 21000-34-00-20-095-03-02 from Bently Nevada delivers a robust solution. This proximity probe housing assembly is part of the 21000 series, designed for externally mounted probes. It features an aluminum body with a 304 stainless steel sleeve, ensuring durability in harsh conditions. The assembly includes a 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals, and CSA Type 4 enclosure certification. With a 1.0 m probe cable and a maximum dimension of 32.9 in (83.5 cm), it meets API 670 standards for external mounting.

Key Features & Technical Specs

• Probe Option: 3300 XL 8 mm probe with connector protector and selectable hazardous area approvals.
• Standoff Adapter: 2.0 in (20 suffix) for precise positioning.
• Probe Penetration: 9.5 in (095 suffix) ensures deep insertion.
• Mounting Thread: 3/4-14 NPT (-02 option) for secure installation.
• Material: Aluminum body with 304 stainless steel sleeve for corrosion resistance.
• Maximum (C) + (D) Dimension: 32.9 in (83.5 cm) for flexible routing.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• 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 various cable sizes.

One distinctive spec is the 2.0 in standoff adapter, which allows precise gap adjustment for optimal probe performance in tight spaces.

Applications & Use Cases

In oil and gas refineries, the 21000-34-00-20-095-03-02 monitors shaft vibration on pumps and compressors. Its explosion-proof rating makes it ideal for hazardous areas. Similarly, in petrochemical plants, it provides reliable data for predictive maintenance. By using this housing, engineers reduce unplanned downtime and extend equipment life.

Installation & Setup

Mount the housing using the 3/4-14 NPT thread option for a secure fit. Attach the standoff adapter (2.0 in) to set the probe gap. Route the probe cable through the cable seal grip, selecting the appropriate grommet for cable sizes from 1/8 to 3/8 inches. Ensure the dome cover is tightened properly to maintain the CSA Type 4 enclosure rating.

Maintenance & Reliability

Inspect the O-rings and thread seal periodically to prevent moisture ingress. The 304 stainless steel sleeve resists corrosion, reducing replacement frequency. Regular checks of the cable seal grip maintain the explosion-proof integrity. This routine care minimizes lifecycle costs.

Compatibility & Integration

The 21000-34-00-20-095-03-02 works with Bently Nevada 3300 XL series proximity probes. It integrates with monitoring systems that accept 8 mm probe inputs. For hazardous area applications, pair it with intrinsically safe barriers as needed.

Comparison with Similar Housings

Compared to the 24701 stainless steel housing, the 21000 aluminum model offers lighter weight (1.1 kg vs. heavier steel) and similar CSA approvals. While both support 8 mm probes, the 21000 is cost-effective for non-corrosive environments. The standoff adapter options (e.g., 2.0 in) provide flexibility that fixed-length housings lack.

FAQs about 21000-34-00-20-095-03-02

Q: What is the maximum cable length for this housing?

A: The probe cable length is 1.0 m, with a maximum (C) + (D) dimension of 32.9 in (83.5 cm).

Q: Is this housing explosion-proof?

A: Yes, it is rated explosion proof for hazardous areas with CSA Type 4 enclosure certification.

Q: What mounting thread options are available?

A: The -02 suffix specifies 3/4-14 NPT, required if the standoff adapter length option is not -00.

Q: What fittings are included with the housing?

A: 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.

Q: Can this housing be used with intrinsically safe probes?

A: Yes, it supports hazardous area approved proximity probes for intrinsically safe applications.

Product Support & Availability

The 21000-34-00-20-095-03-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for ordering assistance or technical inquiries.