Product Overview

The Bently Nevada 24701-28-10-35-027-03-02 represents the industry standard for external proximity probe mounting in mission-critical rotating machinery. This rugged housing assembly enables the installation of 3300 XL 8mm proximity transducers through the machine case, providing a pressure-tight seal and mechanical protection. It serves as a vital interface in Turbine Supervisory Instrumentation (TSI) systems, allowing for the precise measurement of radial vibration and axial thrust. By utilizing this assembly, plant engineers can perform probe gap adjustments or sensor replacements without disassembling the machine or causing operational downtime. Engineered for high-temperature and high-pressure environments, this housing ensures that sensitive displacement signals remain undistorted, directly contributing to the reliability of your Bently Nevada 3500 monitoring rack.

Configuration Matrix Logic

The 24701 series employs a specific suffix code to define its mechanical dimensions and compatibility. The configuration for the 24701-28-10-35-027-03-02 is decoded as follows:

Suffix Breakdown

• -28 (Unthreaded Standoff): Specifies a 2.8-inch unthreaded standoff length for the probe lead exit.

• -10 (Overall Standoff Length): Indicates a 1.0-inch increment for total adapter length.

• -35 (Probe Penetration): Defines the depth the probe extends into the machine case (3.5 inches).

• -027 (Fittings Option): Includes 3/4-14 NPT explosion-proof fittings for hazardous area wiring.

• -03 (Mounting Thread): Standard 3/4-14 NPT threads for secure machine case attachment.

• -02 (Probe Option): Pre-configured and machined to accept 3300 XL 8mm Proximity Probes.

Mechanical Specifications

Field Implementation Strategy

Optimal signal integrity starts with a correct mechanical gap. Engineers must utilize a calibrated multimeter to set the "Gap Voltage"—typically -10.00 VDC for a 3300 XL 8mm system—before locking the housing. Ensure the O-rings are lubricated with a compatible lubricant to prevent pressure leaks from the machine casing. During wiring, maintain a minimum bend radius for the extension cable within the standoff to prevent fatigue. For installations in high-vibration zones, we recommend the use of liquid thread locker on the mounting threads to prevent the assembly from backing out over time.

Operational Excellence

This housing assembly is purpose-built to survive the caustic atmospheres of refineries and the extreme thermal cycles of power plants. The anodized aluminum and stainless steel construction resists corrosion while providing a robust shield against electromagnetic interference (EMI). Its integration with the Bently Nevada 3500/42M Proximitor modules ensures seamless data flow into your DCS, such as Honeywell Experion or DeltaV, enabling advanced predictive maintenance and emergency trip functionality in full compliance with API 670 standards.

Ordering Information

Each order for the 24701-28-10-35-027-03-02 includes:

• The primary probe housing body and standoff adapter.

• Internal probe sleeve and locknut.

• High-pressure O-ring and sealing gaskets.

• Instruction manual and Factory Acceptance Test (FAT) documentation.

• Note: The 3300 XL proximity probe and extension cable are sold separately.

Logistics & Global Shipping

We facilitate rapid global deployment to minimize your project lead times.

• Shipment Window: 2-7 days upon payment verification.

• Carrier Partners: Premium service via DHL Express, FEDEX, or UPS.

• Packaging Protocol: All units are vacuum-sealed in anti-static industrial packaging and double-boxed to withstand international transit stresses.

• Tracking: Real-time tracking numbers provided immediately upon dispatch.

Maintenance Knowledge Base

Q1: Can I adjust the probe depth while the machine is running?

A1: Yes. The 24701 design allows for "online" adjustment. By loosening the external locknut, you can move the probe sleeve to recalibrate the gap without breaching the machine's primary pressure seal.

Q2: What is the significance of the -35 penetration depth?

A2: This specifies that the probe tip will extend 3.5 inches from the mounting face. It is critical to verify your machine case thickness and shaft clearance to prevent mechanical contact between the probe and the shaft.

Q3: Is this housing compatible with the older 7200 series probes?

A3: The suffix -02 is specifically bored for the 3300 XL 8mm series. While the threads may be similar, the internal sleeve geometry and cable exit dimensions are optimized for the 3300 XL; using a 7200 series probe may compromise the IP rating and signal stability.