Product Overview

The Bently Nevada 24701-28-05-00-040-00-01 is a specialized proximity probe housing assembly. This unit contains a 3300 XL 8mm probe with multiple approvals. The housing body comes as cast without threads (mounting thread option 01). Therefore, you must machine your own mounting threads to match your machine case. The 24701-28-05-00-040-00-01 suits custom installations where standard NPT threads do not fit. Engineers select this model for unique mounting holes or specialty machinery. The 4 inch probe penetration works well for many standard shaft configurations.

Technical Specifications

Materials & Construction

The housing body uses 303 stainless steel for superior corrosion resistance. The probe sleeve uses 304 stainless steel for high mechanical strength. A dome cover screws into the top of the housing body. Threaded ports accept customer-supplied conduit fittings. Multiple O-rings create a reliable environmental seal. A thread seal compound prevents leakage at connection points.

Unique Mounting Thread Feature

This model uses mounting thread option 01: as cast without threads. Consequently, the housing body has no pre-cut mounting threads. You must machine your own threads to match your machine case. This feature provides maximum flexibility for non-standard mounting holes. However, you assume responsibility for proper thread cutting. Therefore, follow precision machining practices to maintain the IP66 seal.

Probe & Cable Details

The assembly contains a 3300 XL 8mm probe with approval option 28. This probe carries multiple agency certifications for hazardous locations. The probe cable length is 0.5 metre (20 inches) . This short cable minimizes signal loss and installation bulk. A gold-plated ClickLoc connector sits at the cable end. The model uses no standoff adapter (option -00). The probe penetration (C dimension) is 4 inches (040) .

Dimensional Limits

The probe part number and serial number are not visible after installation. The maximum total (C + D) dimension is 13.5 inches (34.3 mm) . The 4 inch penetration suits machines with moderate internal clearance. Always verify shaft positions before ordering this model.

Fittings & Mounting

The fittings option (00) means no fittings are included . You receive the housing assembly only. This option suits users with existing conduit parts. You must supply your own cable seal grip, plugs, and reducers. The mounting thread option (01) is as cast without threads . Therefore, you cannot screw this housing directly into a standard NPT port. Machine your own threads or weld the housing into place.

Weight & Physical Data

The typical weight is 1.8 kg (4.1 lb) without any fittings. This weight includes the housing, probe, and cable. The stainless steel construction adds durability without excess weight. The dome cover seals securely against dust and moisture. The short 0.5 metre cable reduces bulk for tight conduit runs.

Installation Guide

Follow these steps to install the Bently Nevada 24701-28-05-00-040-00-01 correctly. First, machine your own mounting threads into the housing body. Match the thread type and pitch to your machine case. Alternatively, weld a threaded adapter onto the housing. Second, clean the mounting hole on your machine case thoroughly.

Third, apply thread sealant to your machined threads. Screw the housing into the machine case by hand. Tighten with a wrench to 29.5 N·m. Fourth, adjust the probe penetration to the 4 inch setting. Use a depth gauge to verify the probe tip position. Set the air gap to 1.27 mm (50 mils) from the shaft surface.

Fifth, tighten the probe sleeve locknut to 39.3 N·m. This locks the probe at the correct depth. Sixth, install your own conduit fittings into the threaded ports. Route the 0.5 metre probe cable through your cable gland. Connect the ClickLoc connector to your extension cable. Finally, screw the dome cover onto the housing. Hand-tighten only.

Package Contents

• One Bently Nevada 24701 housing assembly body (as cast without threads)

• One dome cover with pre-installed O-rings

• One 3300 XL 8mm probe with approvals (option 28)

• One 0.5 metre probe cable with ClickLoc connector

• One integrated probe sleeve (304 stainless steel)

• One tube of thread seal compound

• Paper installation instruction sheet

Note: No conduit fittings, no NPT plug, no reducer, and no cable seal grip are included with option -00. Also, no mounting threads are provided on the housing body (option 01).

Frequently Asked Questions (FAQ)

1. Why does the 24701-28-05-00-040-00-01 have no mounting threads?
The mounting thread option 01 means as cast without threads . This design suits custom installations where standard NPT threads do not fit. You must machine your own threads or weld the housing in place.

2. What approvals does the probe option 28 carry for this housing?
The 3300 XL 8mm probe with option 28 carries multiple agency approvals. These include CSA, ATEX, and IECEx for hazardous locations. Therefore, contact Bently Nevada for the complete certification list.

3. Can I see the probe serial number after installing the 24701-28-05-00-040-00-01?
No, the probe part number and serial number are not visible after full installation. Record the probe information before mounting. The maximum visible dimension (C+D) does not expose the label area.

4. What is the probe penetration of the 24701-28-05-00-040-00-01?
The probe penetration (C dimension) is 4 inches (040) . No standoff adapter is included on this model. Therefore, the total extension equals the penetration only.

5. Is the 0.5 metre cable long enough for my installation?
The 0.5 metre (20 inch) cable is best for very short conduit runs. You will need a Bently Nevada extension cable to reach your monitor. The maximum total cable length (probe + extension + field wiring) is 305 metres. Plan your wiring layout accordingly.