21000-28-05-20-018-04-02 | Bently Nevada 8 mm Probe Housing Assembly

What Is the 21000-28-05-20-018-04-02?

When machinery protection demands robust vibration sensing, the 21000-28-05-20-018-04-02 from Bently Nevada delivers a purpose-built solution. This proximity probe housing assembly integrates a 3300 XL 8 mm probe with a 0.5 m (20 in) cable and a 2 in standoff adapter. The 1.8 in probe penetration ensures accurate clearance measurements in rotating equipment.

Engineered for hazardous environments, the housing features an aluminum body with a 304 stainless steel sleeve. It carries CSA Type 4 enclosure certification and is rated explosion proof for North American Class I Divisions 1 and 2 Groups C and D, as well as Class II Divisions 1 and 2 Groups E, F, and G. The assembly also complies with RoHS Directive 2011/65/EU.

Key Features & Technical Specs

• Probe Option: 3300 XL 8 mm probe with selectable hazardous area approvals.
• Probe Cable Length: 0.5 m (20 in).
• Standoff Adapter: 2 in length.
• Probe Penetration: 1.8 in.
• Fitting Option: One 3/4-14 NPT plug.
• 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 mm) for 0.5 m cable.

A standout spec is the 1.8 in probe penetration, which allows precise gap setting in tight installations, reducing measurement errors.

Applications & Use Cases

This housing assembly is ideal for monitoring vibration and position in critical rotating machinery such as turbines, compressors, and pumps. Its explosion-proof rating makes it suitable for oil and gas, petrochemical, and power generation facilities. The CSA certification ensures compliance with North American safety standards, while the API 670 compliance supports externally mounted probe housings.

Installation & Setup

Mount the housing using the 3/4-14 NPT thread. The 2 in standoff adapter positions the probe correctly. Ensure the probe cable length of 0.5 m is accounted for during routing. The fitting option includes one 3/4-14 NPT plug for conduit connections. Always follow Bently Nevada’s installation manual for torque and gap settings.

Maintenance & Reliability

Inspect the housing periodically for signs of corrosion or damage, especially in harsh environments. The aluminum body and stainless steel sleeve resist wear. Verify that O-rings and thread seals remain intact to maintain explosion-proof integrity. Regular checks extend service life and reduce unplanned downtime.

Compatibility & Integration

The 21000-28-05-20-018-04-02 works with Bently Nevada monitoring systems that accept 8 mm proximity probes. It integrates seamlessly with vibration monitoring racks and software. For intrinsically safe applications, pair with hazardous area approved probes and CSA-certified housings.

FAQs about the 21000-28-05-20-018-04-02

Q: What is the probe cable length for this model?

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

Q: Is this housing suitable for hazardous areas?

A: Yes, it carries CSA explosion-proof certification for Class I Divisions 1 and 2 Groups C and D, and Class II Divisions 1 and 2 Groups E, F, and G.

Q: What mounting thread does the housing use?

A: The mounting thread is 3/4-14 NPT.

Q: What is the weight of the assembly?

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

Q: Does it comply with RoHS?

A: Yes, it complies with RoHS Directive 2011/65/EU.

Product Support & Availability

The 21000-28-05-20-018-04-02 is available from Petro Auto Tech in new and original factory packing. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.