Bently Nevada 24701-28-05-00-110-03-02 Proximity Probe Housing Assembly

The Bently Nevada 24701-28-05-00-110-03-02 is a proximity probe housing assembly. This unit belongs to the 24701 series from Bently Nevada. Specifically, the 24701 assembly includes a 3300 XL 8mm probe with approval option. The probe cable length measures 0.5 m (20 inches) for flexible installation. Engineers use this assembly for shaft vibration and position monitoring in turbomachinery.

Model Code Breakdown

Understanding the model number helps identify your configuration. The base model 24701 designates Proximity Probe Housing Assemblies. The suffix 28 indicates a 3300 XL 8mm probe with approval option. Next, 05 represents the probe cable length of 20 inches (0.5 m). The 00 means no standoff adapter is included in this assembly. Following that, 110 specifies a probe penetration of 11 inches. The 03 fittings option includes specific conduit components. Finally, 02 designates the mounting thread option as 3/4-14 NPT.

Fittings Included with Option 03

The 03 fittings option provides several useful components. You receive one 3/4-14 NPT plug for sealing unused ports. Additionally, the kit includes one 3/4-14 to 1/2-14 NPT reducer. This reducer allows connection to smaller conduit sizes. A cable seal grip comes with three interchangeable grommets. These grommets accommodate the following cable sizes:

• 1/8 to 3/16 inches for smaller cables

• 1/4 to 5/16 inches for medium cables

• 5/16 to 3/8 inches for larger cables

Material Construction and Durability

The Bently Nevada 24701 features robust stainless steel construction. The main body uses 303 stainless steel for corrosion resistance. Meanwhile, the internal sleeve uses 304 stainless steel for additional protection. These materials withstand harsh industrial environments effectively. Therefore, this housing suits power generation and oil gas applications.

Physical Dimensions and Weight

The typical weight reaches 1.8 kg (4.1 lb) without fittings installed. With fittings, the weight increases slightly for shipping purposes. The maximum combined dimension (C + D) measures 13.5 inches (34.3 mm). Notably, the probe P/N and S/N are not visible on this assembly. The probe remains completely enclosed within the housing for protection.

Assembly Components Overview

The 24701 proximity probe housing assembly includes several key parts. A dome cover screws into the body of the housing securely. Threaded ports allow conduit connections for wiring protection. A probe sleeve of optional length holds the sensor in position. O-rings provide environmental sealing between housing sections. A reverse mount proximity probe performs the actual measurement. A thread seal prevents leakage through the threaded connections. Optional conduit fittings adapt to various cable types. An optional standoff adapter extends the mounting distance when needed.

Probe and Cable Specifications

The probe uses 3300 XL 8mm technology for reliable measurements. This probe requires a separate proximitor for signal conditioning. The cable length is fixed at 0.5 m (20 inches) from probe to connector. Extension cables can extend this distance when necessary. Always use Bently Nevada approved extension cables for best performance.

Mounting Thread Details

The mounting thread option is 3/4-14 NPT for this configuration. This standard pipe thread fits many industrial mounting adapters. Apply thread sealant during installation to prevent leakage. Do not overtighten the housing into the mounting hole. Use the thread seal included with the assembly for best results.

Step-by-Step Installation Guide

Follow these steps to install your Bently Nevada 24701-28-05-00-110-03-02 correctly.

Step 1: Prepare the Mounting Hole
First, clean the mounting hole threads thoroughly before installation. Apply thread sealant to the housing mounting threads. Then, check that the hole depth matches the 11 inch probe penetration.

Step 2: Install the Housing
Next, screw the 24701 housing into the prepared mounting hole. Turn the housing by hand until it seats lightly. Do not use tools on the housing body directly. Tighten only the hex nut portion if available.

Step 3: Route the Probe Cable
After mounting, route the probe cable away from hot surfaces. Use the cable seal grip with appropriate grommet size. Pass the cable through the grip before connecting. Then, tighten the grip to secure the cable in place.

Step 4: Connect Conduit Fittings
Now, attach the 3/4-14 NPT conduit fitting to the housing port. Use the reducer if your conduit uses 1/2-14 NPT thread. Install the plug in any unused ports for sealing. Ensure all connections are tight and leak-proof.

Step 5: Install the Dome Cover
Apply O-ring lubricant before installing the dome cover. Screw the dome cover onto the housing body firmly. Hand-tighten only to avoid damaging the threads. The cover protects the internal probe from physical damage.

Step 6: Connect to Proximitor
Finally, connect the probe cable to a Bently Nevada proximitor. Follow the proximitor manual for proper gap voltage setup. Verify the probe gap within the specified range. Test the system with a target simulator before commissioning.

Complete Package Contents

Your Bently Nevada 24701-28-05-00-110-03-02 shipment includes the following items:

• 24701 Proximity Probe Housing Assembly (1 unit)

• 3/4-14 NPT plug for port sealing

• 3/4-14 to 1/2-14 NPT reducer

• Cable seal grip with three interchangeable grommets

• O-rings and thread seal material

• Product documentation and installation manual

Note: Shipping partners include FedEx, UPS, and DHL.

Frequently Asked Questions (FAQ)

Q1: What probe type is inside the Bently Nevada 24701 housing?
The 24701 contains a 3300 XL 8mm reverse mount proximity probe. This probe requires a separate Bently Nevada proximitor for operation. The probe is pre-installed and factory-sealed inside the housing.

Q2: What is the maximum cable length for this probe assembly?
The 24701-28-05-00-110-03-02 comes with a fixed 0.5 m (20 inch) probe cable. You can extend this using Bently Nevada extension cables. Total system cable length must follow proximitor specifications for accuracy.

Q3: Can I use this housing in a hazardous area?
The 24701 probe has approval options depending on the suffix code. The -28 suffix includes approval option for certain hazardous areas. Check your specific certification documentation before installation.

Q4: What is the probe penetration length of this assembly?
The probe penetration measures 11 inches (110 suffix code). This distance comes from the mounting thread to the probe tip. Always match penetration to your machine's internal clearance dimensions.

Q5: How do I know if the probe is working correctly?
Connect the 24701 probe to a Bently Nevada proximitor first. Measure the DC gap voltage at the proximitor output. The gap voltage should fall within -8 Vdc to -11 Vdc for proper operation. Use a target simulator to verify linear response before installation.