The Bently Nevada 31000-27-05-00-035-03-02, also cataloged as the 31000 Proximity Probe Housing, operates as a dedicated hardware component for the mechanical positioning and environmental containment of eddy-current proximity probes within industrial machinery.

Model Configuration Breakdown

The 31000-27-05-00-035-03-02 defines a specific housing assembly configuration. The part number parameters specify a housing length of 35 mm, a 1/2-20 UNF probe thread interface, and a 1/2-inch NPT mounting thread. This assembly provides the structural interface required to position the transducer tip relative to a conductive target surface while maintaining a hermetic seal against internal machine case pressures and lubricants.

Hardware Specifications

Mechanical Monitoring & Eddy-Current Transduction

Stable operation of proximity transducer systems depends on the rigidity of the housing assembly. The 31000 series housing allows for precise axial adjustment of the probe tip, facilitating the -10 VDC gap voltage validation required for linear output. Rotor dynamics analysis is highly sensitive to mounting-induced vibration; therefore, the housing must be secured to the machine casing using the included jam nut to prevent mechanical drift. Cross-talk suppression is achieved by observing minimum spacing requirements when multiple housings are mounted in close proximity on the same axial plane.

Ordering info

• 1x 31000-27-05-00-035-03-02 Probe Housing Assembly

• 1x Jam nut

• 1x O-ring seal kit

• 1x Installation technical manual

Field Installation Guidelines

• Machining: Prepare the machine mounting boss with a hole tapped perpendicular to the shaft centerline to prevent angular measurement errors.

• Sealing: Apply thread sealant compatible with process lubricants to the NPT threads before installation into the machine case.

• Locking: After the probe gap is set to the nominal -10 VDC target, tighten the jam nut to 5.1 N-m (45 in-lb) to ensure structural stability.

• Inspection: Verify the integrity of the O-ring seal during each maintenance interval to prevent lubricant leakage from the machine casing.

Frequently Asked Questions

• Is this housing compatible with standard 8 mm probes? Yes, the internal 1/2-20 UNF threads are standard for Bently Nevada 8 mm and 5 mm proximity probes.

• Does this assembly include a proximity probe? No, the 31000 series is a mechanical housing; the transducer and extension cable are ordered separately.

• Can this housing be used in high-pressure cases? Ensure that the housing and thread sealant are rated for the internal casing pressure of the specific machine.

• What is the purpose of the 35 mm length? The length is selected to provide the necessary reach for the probe tip to clear the machine casing thickness.

• Can the jam nut be reused? Yes, provided the threads are clean and free of damage. Inspect for thread deformation before reinstallation.

• Is the housing affected by corrosive environments? The stainless steel construction is resistant to standard industrial hydrocarbons; verify compatibility for specialized chemical process fluids.

• How is angular alignment verified? Use a target dummy or dial indicator to ensure the probe tip is perfectly centered and square to the target surface.

• Why is anti-seize recommended? Anti-seize compound prevents thread seizing in high-temperature applications, facilitating easier removal during future maintenance.