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Introduction
The Bently Nevada 31000-28-10-00-026-00-02 is a 31000 Series proximity probe housing designed to provide secure mechanical support and environmental protection for compatible 3300 XL 8 mm proximity probes. It is intended for installations where the probe is mounted through the machine casing and must maintain a stable position relative to the rotating shaft.
This particular configuration combines a 3300 XL 8 mm probe option, 1.0 m cable, no standoff adapter, 2.6-inch probe penetration, no additional fittings, and a 3/4-14 NPT mounting thread. The resulting arrangement is well suited to relatively short-penetration applications where straightforward probe access and precise mechanical positioning are priorities.
The 31000 Series housing is especially useful in machinery-monitoring installations because it allows technicians to access the probe and extension cable externally for gap adjustment or replacement without requiring major machine disassembly. This can make routine maintenance more efficient while helping preserve the original probe geometry.
Technical Specifications
The model number provides a useful description of the complete configuration. In 31000-28-10-00-026-00-02, the 28 option identifies compatibility with a 3300 XL 8 mm probe, 10 identifies the 1.0 m cable configuration, 00 indicates no standoff adapter, 026 specifies a 2.6-inch penetration, the second 00 indicates no additional fittings, and 02 identifies the 3/4-14 NPT mounting thread.
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 31000-28-10-00-026-00-02 |
| Product Type | Proximity Probe Housing |
| Product Series | 31000 Series |
| Compatible Probe | 3300 XL 8 mm |
| Probe Option | 28 |
| Cable Length | 1.0 m / approximately 39 in |
| Standoff Adapter | None |
| Probe Penetration | 2.6 in |
| Fittings | None |
| Mounting Thread | 3/4-14 NPT |
| Housing Material | Glass-reinforced conductive PPS |
| Sleeve Material | AISI 304 stainless steel |
| Screw Material | AISI 303 stainless steel |
| Environmental Protection | NEMA 4X / IP66 configuration |
| Primary Function | Probe mounting and environmental protection |
| Measurement Application | Radial vibration / shaft displacement |
| Typical Probe Family | 3300 XL 8 mm |
| Overall Dimensions | Approximately 2.6 in penetration; complete envelope depends on installed configuration |
| Approximate Unit Weight | 1.2 kg / 2.65 lb |
| Installation | Through-machine-case mounting |
Applications
Radial Shaft Vibration Monitoring
The 31000 housing is intended primarily for radial mounting of proximity transducers through the machine casing. When correctly installed, it provides a stable mechanical reference for measuring relative shaft vibration.
Turbine Installations
Steam and gas turbine auxiliary systems can use proximity probes to monitor shaft behavior. The housing provides a defined mounting interface while allowing maintenance access from outside the machine casing.
Compressor Monitoring
For compressors, stable probe positioning is essential when monitoring shaft vibration and displacement. The 2.6-inch penetration makes this configuration appropriate for installations where only a relatively short probe extension into the machine is required.
Pump and Motor Monitoring
The housing can be used on suitable pumps, motors, and other rotating equipment where a permanent proximity probe installation is required.
Gearbox Retrofit Projects
The compact penetration configuration can be useful in gearbox and similar machinery retrofits where mounting space is limited. A dedicated housing also makes subsequent probe adjustment or replacement more convenient.
Machinery Protection Systems
When paired with a compatible 3300 XL 8 mm probe, extension system, and monitoring electronics, the housing can form part of a complete machinery protection or condition-monitoring channel.
Maintenance-Friendly Installations
One of the key advantages of the 31000/32000 housing concept is external access to the probe and extension cable. This can allow gap adjustment or probe replacement without disassembling the machine.
Advantages
3300 XL 8 mm Compatibility
The 28 probe option is designed around the 3300 XL 8 mm proximity probe family, making this housing a practical choice for systems already standardized on that sensing platform.
Short 2.6-Inch Penetration
The 2.6-inch penetration provides a compact mechanical arrangement for installations where the probe does not need a long extension into the machine.
1.0 Meter Cable Configuration
The integrated 1.0 m cable configuration provides useful reach between the probe location and the associated connection point while keeping the overall assembly clearly defined.
No Standoff Adapter
The model uses a 00 standoff configuration, giving the assembly a straightforward direct-mount arrangement without an additional standoff component.
Robust PPS Construction
Glass-reinforced PPS provides a strong housing material with good dimensional stability and corrosion resistance while keeping the assembly relatively lightweight.
Stainless-Steel Hardware
The AISI 304 sleeve and AISI 303 screws add mechanical durability and corrosion resistance to the housing assembly.
External Probe Access
The housing concept allows technicians to reach the probe and extension cable externally, which can simplify maintenance and reduce the need for machine disassembly.
IP66 / NEMA 4X Protection
The housing configuration is identified with NEMA 4X and IP66 protection, providing a strong level of enclosure protection against dust and water ingress when properly installed.
Reduced Maintenance Disruption
A purpose-built probe housing can help maintenance personnel perform probe replacement or adjustment with less disruption to the surrounding machinery.
Technical FAQs
1. What is the Bently Nevada 31000-28-10-00-026-00-02?
It is a 31000 Series proximity probe housing configured for a compatible 3300 XL 8 mm proximity probe, with a 1.0 m cable and 2.6-inch probe penetration.
2. Which proximity probe is compatible with this housing?
The 28 configuration corresponds to a 3300 XL 8 mm proximity probe. The exact probe part number should still be checked against the monitoring system before installation.
3. What is the probe penetration?
This model has a 2.6-inch probe penetration, represented by the 026 portion of the part number.
4. How long is the cable?
The housing is configured with a 1.0 meter, approximately 39-inch cable.
5. Does the housing include a standoff adapter?
No. The 00 configuration indicates that no standoff adapter is included.
6. What mounting thread does it use?
The housing uses a 3/4-14 NPT mounting thread, identified by the final 02 in the ordering code.
7. What material is the housing made from?
The housing uses glass-reinforced conductive PPS, with a 304 stainless-steel sleeve and 303 stainless-steel screws.
8. What are the dimensions and weight?
The key dimensional characteristic is the 2.6-inch probe penetration. A listed product weight is approximately 1.2 kg (2.65 lb). The complete installation envelope depends on the probe, cable routing, and mounting arrangement.
9. Can the housing be used for vibration monitoring?
Yes. The 31000/32000 housing family is intended for mounting proximity probes through the machine case and is typically used for radially mounted vibration or Keyphasor measurements.
10. Can the housing be used for axial shaft-position measurement?
The 31000/32000 housing family is primarily intended for radial transducer mounting. For dual-probe axial position measurement, the applicable Bently Nevada housing arrangement should be selected instead; the 31000 housing should not be assumed to be interchangeable with dedicated axial-position housings.
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