21000-16-10-15-034-03-02 | Bently Nevada 3.4 in Probe Penetration Housing Assembly

What Is the 21000-16-10-15-034-03-02?

When rotating machinery demands precise vibration monitoring in hazardous environments, the 21000-16-10-15-034-03-02 from Bently Nevada provides a robust solution. This proximity probe housing assembly combines an aluminum body with a 304 stainless steel sleeve for durability. It is part of the 21000 series, designed for externally mounted proximity probes. The assembly includes a 3300 XL 8 mm probe with a 1.0 m (39 in) cable. A 1.5 in (38 mm) standoff adapter and 3.4 in probe penetration optimize placement. The package comes with one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with grommets for various cable sizes.

Key Features & Technical Specs

• Probe Option: 3300 XL 8 mm probe with connector.
• Probe Cable Length: 1.0 m (39 in).
• Standoff Adapter: 1.5 in (38 mm).
• Probe Penetration (D Dimension): 3.4 in (034).
• Mounting Thread: 3/4-14 NPT.
• Material: Aluminum body with 304 stainless steel sleeve.
• 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, cable seal grip.

A standout feature is the 3.4 in probe penetration, which allows precise positioning within the machine case. This reduces side view effects and ensures accurate vibration readings.

Real-World Applications

In oil and gas refineries, the 21000-16-10-15-034-03-02 monitors compressor and turbine vibrations. Its CSA explosion-proof certification makes it suitable for Class 1 Divisions 1 and 2 Groups C and D areas. For example, a petrochemical plant can install this housing on a critical pump to detect early bearing wear. The assembly also meets API 670 standards for externally mounted probes. Consequently, it supports predictive maintenance programs that reduce unplanned downtime.

Installation Guide

Mount the housing using the 3/4-14 NPT thread. Ensure the probe penetration (C plus D) does not exceed 300 mm without sleeve support. For penetrations between 1.0 and 2.0 inches, counter bore the machine case to minimize side view effects. Adjust the D dimension within a 13 mm (±0.5 in) range. Connect the cable seal grip for cable sizes 1/8 to 3/8 inches. Finally, verify the probe P/N and S/N on the flag label if visible.

Routine Care & Reliability

Inspect the O-rings and thread seal periodically for wear. The aluminum body resists corrosion, while the stainless steel sleeve protects the probe. In harsh environments, check the conduit connections for tightness. Regular inspection per the manufacturer's manual extends service life. This reduces replacement costs over time.

Common Questions

Q: What is the maximum probe cable length for the 21000-16-10-15-034-03-02?

A: The maximum (C) plus (D) dimension is 32.9 in (83.5 cm) with visible probe P/N and S/N.

Q: Is this housing CSA certified for hazardous areas?

A: Yes, it is CSA certified explosion-proof for Class 1 Divisions 1 and 2 Groups C and D, and Class 2 Divisions 1 and 2 Groups E, F, and G.

Q: What fittings come with the 21000-16-10-15-034-03-02?

A: 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 cables 1/8 to 3/8 inches.

Q: Can I adjust the probe penetration after installation?

A: Yes, the D dimension has an adjustment range of 13 mm (±0.5 in).

Q: What is the typical weight without fittings?

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

Product Support & Availability

The 21000-16-10-15-034-03-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for pricing and lead times. We provide original factory packing and a 12-month warranty.