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- Bently Nevada
- 31000-00-00-00-031-01-02
- Proximity Probe Housing Assembly
- USA
- 91.4 × 144.8 mm
- 1.2 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Bently Nevada 31000-00-00-00-031-01-02 is a proximity probe housing assembly used to mount and protect proximity measurement components on rotating machinery. It belongs to the 31000 Series and provides a mechanical enclosure for probe installations where the sensor must pass through the machine casing to measure shaft movement.
Unlike a proximity probe itself, this model is a housing assembly configured without a probe or probe cable. The assembly allows the probe and its associated cable to be installed and serviced separately, making it useful for machinery installations where the sensor configuration is selected according to the existing monitoring system.
The housing is particularly relevant to radial shaft vibration measurement arrangements on compressors, turbines, pumps, and other rotating equipment. In these installations, the probe is positioned near the shaft, while the housing supports the mounting arrangement and provides environmental protection for the installed components.
The model’s ordering configuration specifies a probe penetration option of 3.1 inches, one 3/4-14 NPT conduit fitting with two plugs, and a 3/4-14 NPT mounting thread. These details determine how the assembly interfaces with the machine casing and associated cable-entry arrangement.
The housing uses a glass-reinforced PPS thermoplastic body containing conductive fibers, together with stainless-steel mechanical components. Its construction is intended to protect the installed probe arrangement against the environmental conditions encountered around industrial machinery. The housing is not intended to function as an explosion-proof enclosure or as a pressure-containing vessel.
For example, on a centrifugal compressor, a proximity probe may be installed through the bearing housing to monitor relative shaft vibration. The 31000 housing provides the external mounting and access arrangement, allowing technicians to adjust the probe gap and service the connection without treating the housing and sensing element as a single inseparable component.
The assembly also supports maintenance planning. If a probe requires replacement, the housing can remain installed when its condition and the application permit, reducing the need to disturb the machine-side mounting arrangement. The probe, cable, and signal-conditioning electronics must still be selected as a compatible measurement system.
Correct installation is essential to measurement accuracy. The housing must be secured to the intended mounting point, the probe sleeve must be positioned correctly, and the installed probe must maintain the required sensing gap. The mechanical relationship between the housing and bearing structure is especially important when the system is used for relative shaft vibration measurements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 31000-00-00-00-031-01-02 |
| Product Series | 31000 Proximity Probe Housing Assemblies |
| Product Type | Proximity Probe Housing Assembly |
| Housing Configuration | Housing assembly without probe or probe cable |
| Housing Material | Glass-reinforced PPS thermoplastic with conductive fibers |
| Sleeve Material | AISI 304 stainless steel |
| Outer Sleeve and Exterior Screws | AISI 303 stainless steel |
| Probe Penetration Option | 3.1 inches |
| Standoff Adapter | None |
| Conduit Fitting Configuration | One 3/4-14 NPT fitting and two plugs |
| Mounting Thread | 3/4-14 NPT |
| Typical Application | Radial proximity probe mounting for machinery monitoring |
| Standard Compliance | API 670 |
| Dimensions | 91.4 × 144.8 mm |
| Weight | 1.2 kg |
Product Features
- Dedicated probe housing: Provides the mounting and protective enclosure for a compatible proximity probe installation.
- Probe supplied separately: Allows the sensing element and cable configuration to be selected independently.
- 3.1-inch penetration option: Defines the specified probe penetration configuration for the machine-side installation.
- 3/4-14 NPT mounting thread: Supports installation in a matching threaded mounting arrangement.
- Conduit fitting and plugs: Includes one specified conduit fitting and two plugs for the housing’s cable-entry configuration.
- Glass-reinforced PPS construction: Provides a corrosion-resistant thermoplastic housing material suitable for industrial machinery environments.
- Stainless-steel mechanical components: Supports the sleeve and retaining arrangement used to position the installed probe.
- External probe access: Allows access to the installed probe and cable for adjustment and maintenance.
- Machinery monitoring integration: Supports suitable radial vibration or Keyphasor measurement arrangements using compatible instrumentation.
- API 670 compliance: The 31000/32000 housing family is specified for compliance with API 670 requirements.
Working Principle
The 31000-00-00-00-031-01-02 does not generate a measurement signal by itself. Its role is to provide the mechanical mounting and environmental protection required for a compatible proximity probe and its associated connection.
Machine Casing → Probe Housing Assembly → Installed Proximity Probe → Signal-Conditioning Electronics → Monitoring System
During installation, the housing is fitted over the appropriate outer sleeve or mounting arrangement at the machine casing. The probe is inserted and adjusted so that its sensing tip faces the intended target at the required clearance. Once the probe position is established, the housing retains the installation arrangement and protects the accessible probe connection.
When the installed probe operates, its sensing circuit detects changes in the gap between the probe tip and a conductive shaft. Compatible signal-conditioning electronics process the probe response, allowing the monitoring system to evaluate shaft vibration or other supported displacement measurements.
The housing contributes to measurement quality by maintaining the probe’s mechanical position. If the housing or its mounting point moves relative to the bearing structure, the resulting signal may include unwanted movement of the measurement reference. This is particularly relevant when monitoring relative shaft vibration.
The assembly also allows access to the probe and cable for servicing. Technicians can perform approved gap adjustments or replace compatible components without necessarily removing the complete housing from the machine. The maintenance procedure must preserve the intended probe position and prevent contamination or damage to the sensing components.
Because the model is supplied without the probe and cable, those components must be selected separately. The housing’s mechanical compatibility does not automatically establish the electrical compatibility of a chosen probe, extension cable, and Proximitor Sensor.
Role in the Machinery Monitoring Architecture
The Bently Nevada 31000-00-00-00-031-01-02 provides the mechanical interface between the machine casing and the installed proximity probe. It supports the physical positioning and protection of the measurement components, while the probe and monitoring electronics perform the sensing and signal-processing functions.
Machine Casing → 31000 Housing Assembly → Proximity Probe → Proximitor Sensor → Monitoring Module
| System Component | Function |
|---|---|
| Bently Nevada 31000-00-00-00-031-01-02 | Houses and mechanically supports the installed proximity probe |
| Outer Sleeve and Retaining Hardware | Secure the mounting arrangement at the machine casing |
| Proximity Probe | Detects changes in the gap between the probe tip and conductive target |
| Probe Cable | Connects the probe to the compatible transducer circuit |
| Proximitor Sensor | Processes the probe response into a usable measurement signal |
| Bearing Housing | Provides the stationary mechanical reference for relative shaft measurement |
| Rotating Shaft | Provides the target for non-contact displacement sensing |
| Machinery Monitoring Module | Receives and evaluates the measurement signal |
| Machinery Protection System | Applies configured alarm and protective functions through the monitoring architecture |
Industrial Applications
| Application | Typical Use |
|---|---|
| Centrifugal Compressors | Mounting proximity probes for shaft vibration monitoring |
| Steam Turbines | Providing a protected mounting arrangement for compatible shaft measurement probes |
| Gas Turbines | Supporting probe installation at designated machinery measurement points |
| Industrial Pumps | Mounting probes near suitable shaft and bearing locations |
| Power Generation Equipment | Supporting relative shaft vibration measurement installations |
| Petrochemical Plants | Maintaining probe mounting arrangements on critical rotating machinery |
| Refinery Compressors | Providing external access to installed proximity probes and cable connections |
| Process Machinery | Supporting suitable radial vibration and Keyphasor installations |
| Machinery Maintenance Programs | Allowing probe servicing while retaining a serviceable housing arrangement |
| Continuous-Operation Facilities | Supporting maintainable proximity measurement installations on rotating equipment |
Installation and Maintenance
- Verify the housing reference: Confirm that the required assembly is Bently Nevada 31000-00-00-00-031-01-02 and that the installation calls for a housing supplied without a probe or cable.
- Inspect the machine mounting point: Check the threaded mounting interface and surrounding machine casing for damage, contamination, or unsuitable surface conditions.
- Prepare the equipment safely: Follow the site’s isolation and maintenance procedures before accessing the machinery measurement point.
- Confirm the mounting thread: Ensure that the machine-side interface matches the specified 3/4-14 NPT mounting arrangement.
- Install the mounting sleeve: Fit the applicable outer sleeve and retaining components according to the housing installation procedure.
- Position the probe: Install the separately selected compatible probe and adjust its penetration to establish the required sensing gap.
- Check the probe alignment: Confirm that the sensing tip faces the intended target and that the mounting arrangement does not interfere with the shaft or surrounding components.
- Secure the housing: Fit the housing over the mounting arrangement and tighten the retaining components according to the applicable instructions.
- Arrange the cable entry: Use the specified conduit fitting and plugs to establish the intended cable-entry arrangement and close unused openings.
- Reconnect the measurement circuit: Connect the probe to the compatible cable and signal-conditioning electronics without damaging the connector.
- Verify the measurement channel: Check the probe gap and signal response using the approved commissioning procedure.
- Record the installation details: Document the housing reference, probe model, mounting arrangement, gap setting, and commissioning results.
Related Components
| Component | Function |
|---|---|
| Bently Nevada 31000-00-00-00-031-01-02 | Provides the probe housing and mounting arrangement |
| Compatible Bently Nevada Proximity Probe | Measures changes in the gap between the sensing tip and target |
| Probe Outer Sleeve | Provides the mounting interface through the machine casing |
| Probe Retainer and Retaining Nut | Secure the installed sleeve and housing arrangement |
| Conduit Fitting | Provides the designated cable-entry connection |
| Housing Plugs | Close unused housing openings |
| Compatible Extension Cable | Connects the probe to the associated signal-conditioning electronics |
| Bently Nevada Proximitor Sensor | Processes the proximity probe response |
| Machinery Monitoring Module | Receives and evaluates the conditioned measurement signal |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Bently Nevada 31000-00-00-00-031-01-02 | Proximity Probe Housing Assembly | Housing-only configuration with 3.1-inch probe penetration |
| Bently Nevada 31000 Series | Proximity Probe Housing Assembly | Radial probe mounting through machinery casings |
| Bently Nevada 32000 Series | Proximity Probe Housing Assembly | Related housing family for suitable proximity measurement installations |
| Bently Nevada 3300 XL 8 mm Proximity Probe | Proximity Probe | Compatible sensing application where specified by the transducer design |
| Bently Nevada 3300 XL Extension Cable | Extension Cable | Connection between a compatible probe and Proximitor Sensor |
| Bently Nevada Proximitor Sensor | Signal-Conditioning Sensor | Processing the probe response for machinery monitoring |
Key Advantages
- Provides a dedicated mounting and protective enclosure for a compatible proximity probe.
- Allows the probe and cable to be selected separately from the housing.
- Supports external access for probe adjustment and maintenance.
- Uses a specified 3/4-14 NPT mounting and conduit-entry arrangement.
- Supports suitable radial vibration and Keyphasor measurement installations.
Technical FAQs
Does the 31000-00-00-00-031-01-02 include a proximity probe?
No. This ordering configuration specifies that the probe and probe cable are not required as part of the housing assembly. They must be selected separately for the intended measurement system.
What does the 031 option specify?
The 031 option identifies a probe penetration of 3.1 inches. This defines the penetration configuration associated with the housing order code and is not the overall length of a separately installed probe.
What is the purpose of the 3/4-14 NPT mounting thread?
It defines the threaded mounting interface for the housing configuration. The corresponding machine-side mounting point must use a compatible thread arrangement for the assembly to be installed correctly.
Can the housing itself measure shaft vibration?
No. The housing provides mechanical support and environmental protection. Shaft displacement is detected by the separately installed proximity probe, and the resulting signal is processed by compatible signal-conditioning and monitoring equipment.