21000-16-10-15-256-03-02 | Bently Nevada 8 mm Probe Housing Assembly

Introduction to the 21000-16-10-15-256-03-02

When machine vibration monitoring demands precision and durability, the 21000-16-10-15-256-03-02 from Bently Nevada delivers a robust solution. This proximity probe housing assembly is part of the trusted 21000 series, engineered for industrial environments where accurate shaft displacement measurements are critical. With a 3300 XL 8 mm probe, 1.0 meter cable, and 1.5 inch standoff adapter, it provides reliable performance for rotating machinery protection.

Key Features & Technical Specifications

• Probe Option: 3300 XL 8 mm probe with connector for precise proximity sensing.
• Probe Cable Length: 1.0 m (39 in) for flexible installation.
• Standoff Adapter: 1.5 in (38 mm) to position the probe correctly.
• Probe Penetration: 25.6 in for deep machine case insertion.
• Mounting Thread: 3/4-14 NPT for secure attachment.
• Material: Aluminum body with 304 stainless steel sleeve for corrosion resistance.
• 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 cable seal grip with grommets.

A standout feature is the 25.6 inch probe penetration, which allows the sensor to reach deep into bearing housings or casings for accurate readings. This depth reduces side-view effects and improves measurement fidelity in large rotating equipment.

Applications & Use Cases

Industries such as power generation, oil and gas, and heavy manufacturing rely on the 21000-16-10-15-256-03-02 for critical machinery protection. It is ideal for monitoring radial vibration and axial position in turbines, compressors, pumps, and motors. The housing assembly meets API 670 standards, making it suitable for externally mounted proximity probes in hazardous areas. For example, in a steam turbine installation, the deep penetration option ensures the probe tip reaches the shaft target area without interference from casing walls.

Installation & Setup

Mount the housing using the 3/4-14 NPT thread into a pre-drilled hole. For probe penetration lengths between 1.0 and 2.0 inches, counter boring the machine case may reduce side view effects. If the combined probe cable length (C plus D) 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). Use the included fittings: the 3/4-14 NPT plug, reducer, and cable seal grip with appropriate grommets for cable diameters from 1/8 to 3/8 inches.

Maintenance & Reliability

Periodic inspection of the housing assembly ensures long-term reliability. Check the O-rings and thread seal for wear, and verify that the dome cover is tight. The aluminum body and stainless steel sleeve resist corrosion in harsh environments. For hazardous area installations, follow the CSA certification guidelines: Class 1 Divisions 1 and 2 Groups C and D, and Class 2 Divisions 1 and 2 Groups E, F, and G. Operating temperature range is T5 @ Ta = -50 °C to +40 °C or T4 @ Ta = -50 °C to +80 °C. Regular maintenance reduces downtime and extends service life.

Compatibility & Integration

The 21000-16-10-15-256-03-02 integrates with Bently Nevada monitoring systems such as the 3500 Series and System 1 platform. It is compatible with 3300 XL 8 mm proximity probes and standard extension cables. The housing is CSA Type 4 enclosure rated and fully compliant with API 670. For intrinsically safe applications, pair with hazardous area approved proximity probes. The assembly works with conduit connections and supports non-incendive circuits when wired per drawing 140979.

Frequently Asked Questions

What is the probe cable length for the 21000-16-10-15-256-03-02?

The probe cable length is 1.0 m (39 in) as specified by suffix code 10.

What mounting thread does this housing use?

It uses a 3/4-14 NPT thread, which is the default option when the standoff adapter length is not 00.

Is the housing suitable for hazardous areas?

Yes, it has CSA explosion-proof certification for Class 1 Divisions 1 and 2 Groups C and D, and Class 2 Divisions 1 and 2 Groups E, F, and G.

What is the weight of the assembly?

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

What fittings are included with the housing?

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 from 1/8 to 3/8 inches.

Product Support & Availability

The 21000-16-10-15-256-03-02 is available from Petro Auto Tech in new, original factory packaging. It comes with a 12-month factory warranty. Contact Petro Auto Tech for current lifecycle status and ordering assistance.