21000-34-05-20-039-03-02 | Bently Nevada 0.5m Cable Proximity Probe Housing Assembly

Introduction to the 21000-34-05-20-039-03-02 Proximity Probe Housing Assembly

When machinery vibration threatens uptime, the 21000-34-05-20-039-03-02 from Bently Nevada provides a robust solution. This proximity probe housing assembly is engineered for hazardous area applications, featuring an aluminum body with a 304 stainless steel sleeve. It includes a 3300 XL 8 mm probe with connector protector, a 0.5 m (20 in) probe cable, and a 2.0 in standoff adapter. The assembly is rated explosion proof with CSA approvals and complies with API 670 standards.

Key Features & Technical Specifications

• Probe Option: 3300 XL 8 mm probe with connector protector and selectable hazardous area approvals.
• Probe Cable Length: 0.5 m (20 in).
• Standoff Adapter: 2.0 in.
• Probe Penetration: 3.9 in.
• Fitting Option: 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 3/16 in, 1/4 to 5/16 in, and 5/16 to 3/8 in.
• Mounting Thread: 3/4-14 NPT.
• Material: Aluminum body with 304 stainless steel sleeve.
• Maximum (C) + (D) Dimension: 13.5 in (34.3 cm) with visible probe P/N and S/N not visible.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.

One distinctive spec is the 0.5 m probe cable length, which enables close-coupled mounting in tight machine train configurations, reducing signal noise and installation complexity.

Applications & Use Cases

Engineers rely on the 21000-34-05-20-039-03-02 for critical rotating machinery such as turbines, compressors, and pumps. Its CSA Type 4 enclosure and explosion-proof rating make it suitable for hazardous environments like oil refineries and chemical plants. The assembly supports API 670 compliance, ensuring consistent vibration monitoring in demanding industrial settings.

Installation & Setup

Mount the housing using the 3/4-14 NPT thread option. Ensure the standoff adapter is set to 2.0 in and probe penetration to 3.9 in. Route the 0.5 m cable through the cable seal grip, selecting the appropriate grommet for your cable diameter. Tighten fittings to prevent moisture ingress. Always follow Bently Nevada’s installation manual for torque specifications and hazardous area requirements.

Maintenance & Reliability

Periodically inspect the housing for corrosion or damage, especially in corrosive environments. Verify that the O-rings and seals remain intact to maintain the CSA Type 4 rating. The aluminum body with stainless steel sleeve resists wear, but routine checks every six months help ensure long-term reliability. Replacing worn grommets during cable changes prevents seal failure.

Compatibility & Integration

The 21000-34-05-20-039-03-02 integrates with Bently Nevada monitoring systems that accept 3300 XL 8 mm proximity probes. It is compatible with standard vibration monitoring racks and can be paired with extension cables and signal conditioners. The assembly’s selectable hazardous area approvals allow use in both intrinsically safe and explosion-proof installations.

Troubleshooting & Common Issues

If the probe signal is unstable, check the cable seal grip for proper compression and verify that the probe tip is not damaged. Ensure the standoff adapter length matches the 2.0 in specification—incorrect standoff can cause measurement errors. For intermittent readings, inspect the connector protector for debris or corrosion. Refer to Bently Nevada documentation for advanced diagnostics.

FAQ about 21000-34-05-20-039-03-02

What is the probe cable length of the 21000-34-05-20-039-03-02?

The probe cable length is 0.5 m (20 in).

What is the standoff adapter length for this model?

The standoff adapter length is 2.0 in.

What probe penetration does the 21000-34-05-20-039-03-02 provide?

The probe penetration is 3.9 in.

What mounting thread option is available?

The mounting thread option is 3/4-14 NPT.

What hazardous area approvals does this assembly have?

It is rated explosion proof with CSA approvals and is certified as a CSA Type 4 enclosure.

Product Support & Availability

The 21000-34-05-20-039-03-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for lead times and bulk pricing. We provide a 12-month factory warranty and original factory packaging.