21000-28-05-30-095-04-02 | Bently Nevada 8 mm Probe Housing Assembly

What Is the 21000-28-05-30-095-04-02?

When machine vibration threatens uptime, the 21000-28-05-30-095-04-02 provides a robust housing solution. This Bently Nevada proximity probe housing assembly is designed for externally mounted probes in hazardous areas. It features an aluminum body with a 304 stainless steel sleeve, ensuring durability in demanding environments.

Part of the 21000 series, the 21000-28-05-30-095-04-02 supports a 3300 XL 8 mm probe with selectable hazardous area approvals. The unit includes a 0.5 m (20 in) probe cable and a 3 in standoff adapter. With a probe penetration of 9.5 in, it offers flexibility for various machine configurations.

Key Features & Technical Specs

• Probe Type: 3300 XL 8 mm proximity probe with selectable hazardous area approvals.
• Probe Cable Length: 0.5 m (20 in).
• Standoff Adapter Length: 3 in.
• Probe Penetration: 9.5 in (adjustable ±0.5 in).
• Fittings: One 3/4-14 NPT plug only.
• Mounting Thread: 3/4-14 NPT.
• Material: Aluminum body with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Maximum (C) + (D) Dimension: 13.5 in (34.3 cm) with 0.5 m cable.

A distinctive spec is the adjustable probe penetration range of ±0.5 in, allowing fine-tuning during installation. This reduces the risk of measurement errors and improves reliability.

Real-World Applications

In rotating machinery monitoring, the 21000-28-05-30-095-04-02 excels. It is fully compliant with API 670 Standard for externally mounted proximity probe housings. For example, in a steam turbine application, the housing protects the probe from harsh conditions while maintaining accurate vibration readings. Consequently, operators gain early warning of bearing wear or imbalance.

Furthermore, the CSA Type 4 enclosure rating makes it suitable for outdoor and washdown environments. This expands its use to pumps, compressors, and fans in refineries and chemical plants.

Installation Guide

Mount the 21000-28-05-30-095-04-02 using the 3/4-14 NPT thread. For probe penetration lengths between 1.0 and 2.0 inches, counter boring the machine case may be necessary to reduce side view effects. If the combined C plus D dimension exceeds 300 mm (12 in), add sleeve support near the probe to prevent resonance. The adjustment range of probe penetration option D is 13 mm (±0.5 in).

Ensure the probe cable is routed without sharp bends. The visible probe P/N and S/N may appear on a flag label for some C plus D combinations. Always follow the manufacturer's manual for torque specifications.

Routine Care & Reliability

Regular inspection of the 21000-28-05-30-095-04-02 ensures long service life. Check O-rings and thread seals for wear during scheduled maintenance. The aluminum body resists corrosion, while the 304 stainless steel sleeve provides additional protection. For hazardous area installations, verify that all fittings remain tight and the enclosure maintains its explosion-proof rating.

By following a preventive maintenance schedule, users reduce unplanned downtime and extend equipment life. This aligns with a cost-benefit approach, as early detection of seal degradation prevents costly failures.

Common Questions About the 21000-28-05-30-095-04-02

Q: What is the maximum (C) + (D) dimension for this model?

A: With a 0.5 m probe cable, the maximum (C) + (D) dimension is 13.5 in (34.3 cm).

Q: Is the 21000-28-05-30-095-04-02 suitable for hazardous areas?

A: Yes, it supports selectable hazardous area approvals and is rated explosion proof for hazardous areas with CSA approvals.

Q: What mounting thread does this housing use?

A: It uses a 3/4-14 NPT mounting thread, which must be ordered if the standoff adapter option is not -00.

Q: Can the probe penetration be adjusted after installation?

A: The adjustment range of probe penetration option D is 13 mm (±0.5 in), allowing fine-tuning during setup.

Q: What is the typical weight of this assembly?

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

Product Support & Availability

The 21000-28-05-30-095-04-02 is in stock and ready to ship from Petro Auto Tech. As an industrial automation parts supplier, Petro Auto Tech offers new and original factory-packed units with a 12-month warranty. Contact our team for pricing and lead times.