21000-16-05-15-085-03-02 | Bently Nevada 8 mm Proximity Probe Housing Assembly

What Is the 21000-16-05-15-085-03-02?

When machine vibration threatens uptime, the 21000-16-05-15-085-03-02 from Bently Nevada provides a robust housing solution for proximity probes. This assembly is designed for externally mounted probes in hazardous areas, offering explosion-proof certification and compliance with API 670. With a 3300 XL 8 mm probe and 0.5 m cable, it delivers accurate shaft displacement measurements in rotating machinery.

Key Features & Technical Specs

• Probe option: 3300 XL 8 mm probe with connector.
• Probe cable length: 0.5 m (20 in).
• Standoff adapter: 1.5 in (38 mm).
• Probe penetration (D dimension): 8.5 in.
• Fittings: One 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip.
• Mounting thread: 3/4-14 NPT.
• Material: Aluminum body with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Hazardous area approvals: CSA certified for Class 1 Divisions 1 and 2 Groups C and D; Class 2 Divisions 1 and 2 Groups E, F, and G; Class III; Enclosure Type 4; T5 @ Ta = -50 °C to +40 °C; T4 @ Ta = -50 °C to +80 °C.

The distinctive 8.5 in probe penetration allows deep insertion into machine casings, reducing side-view effects and improving measurement accuracy in tight installations.

Installation & Setup

Mount the 21000-16-05-15-085-03-02 using the 3/4-14 NPT thread. For probe penetration lengths between 1.0 and 2.0 inches, counter boring the machine case may reduce side-view effects. If the total probe penetration (C plus D) exceeds 300 mm (12 in), add sleeve support near the probe to prevent resonance. The adjustment range of the D dimension is 13 mm (± 0.5 in).

Maintenance & Reliability

From a maintenance engineer's perspective, the aluminum body with stainless steel sleeve offers corrosion resistance in harsh environments. The included O-rings and thread seal help maintain enclosure integrity. Periodic inspection of the cable seal grip and fittings ensures continued explosion-proof protection. This design reduces the need for frequent recalibration, supporting long service intervals.

Compatibility & Integration

The 21000-16-05-15-085-03-02 is fully compliant with API 670 for externally mounted proximity probe housings. It works with Bently Nevada monitoring systems that accept 3300 XL 8 mm probe inputs. The CSA Type 4 enclosure rating makes it suitable for outdoor and washdown environments.

Common Questions About the 21000-16-05-15-085-03-02

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

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

Q: What mounting thread does the housing use?

A: It uses a 3/4-14 NPT mounting thread.

Q: Is this housing suitable for hazardous areas?

A: Yes, it is CSA certified for explosion-proof applications in Class 1 Divisions 1 and 2 Groups C and D, and other hazardous classifications.

Q: What probe does this assembly include?

A: It includes a 3300 XL 8 mm probe with connector.

Q: What is the typical weight without fittings?

A: The typical weight is 1.1 kg (2.4 lb).

Product Support & Availability

The 21000-16-05-15-085-03-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for current lifecycle status and availability before ordering.