Product Overview

The Bently Nevada 4190-36 is a threaded adapter in the 3300 XL Transducer Accessories family. It provides a mechanical interface between compatible proximity measurement hardware and an installation point with a different thread configuration. Rather than measuring vibration or generating an electrical signal, this component addresses the mechanical connection requirements of a proximity probe installation.

In rotating machinery such as centrifugal compressors, steam turbines, and industrial pumps, proximity probes are commonly installed near the shaft to monitor relative displacement. The mounting arrangement must accommodate the machine port, probe connection, and associated cable routing. The 4190-36 can be used in applicable installations where its thread configuration matches the required connection.

This adapter features a 10.3 mm internal diameter and a 3/4-14 NPT external thread. Its internal thread configuration accommodates the specified 1/4-18 NPT and 3/8-24 UNF-2B connections. This combination distinguishes the 4190-36 from other adapters in the 4190 family, which use different thread combinations and overall lengths.

The adapter is manufactured from 304 stainless steel, making material compatibility and mechanical condition relevant considerations during installation. When replacing an existing adapter, engineers should compare the complete part number, internal thread, external thread, and mating components rather than relying on the internal diameter alone. The 4190-36 is a passive mounting accessory; the actual measurement function depends on the connected proximity probe and compatible transducer electronics.

Technical Specifications

Product Features

• Multiple internal thread options: Accommodates the specified 1/4-18 NPT and 3/8-24 UNF-2B connection configurations.
• 3/4-14 NPT external thread: Supports mounting arrangements that require the corresponding external pipe thread.
• 304 stainless-steel construction: Suitable for industrial mounting applications where corrosion resistance and mechanical durability are important.
• Defined internal diameter: The 10.3 mm opening helps distinguish this model from adapters with smaller internal bores.
• Accessory-level compatibility: Supports mechanical integration within applicable 3300 XL proximity measurement installations.
• Clear model identification: The 4190-36 part number distinguishes its thread arrangement from other 4190 adapter variants.
• Passive mechanical function: Provides a connection interface without introducing an additional electrical measurement stage.

Working Principle

The 4190-36 functions as a mechanical adapter rather than an electronic sensor. Its purpose is to connect compatible components through the specified threaded interfaces so that the proximity probe mounting arrangement can be installed correctly.

A typical proximity measurement installation follows this arrangement:

Machine Port → 4190-36 Adapter → Compatible Probe Mounting Connection → Proximity Probe → Extension Cable → Proximitor Sensor

The external 3/4-14 NPT thread engages with the corresponding mounting port or mating component. The internal thread accommodates the specified connection used by the installation. Once properly fitted, the adapter provides the mechanical interface required for the connected components.

For example, during maintenance on a compressor, an engineer may need to replace an adapter while retaining the existing proximity measurement system. The replacement must match the machine-side port and the probe-side connection. If the thread arrangement is incorrect, the components may not engage properly, and the probe may not reach its intended mounting position.

The adapter does not determine the probe’s sensitivity, linear range, or frequency response. Those characteristics depend on the selected probe, extension cable, Proximitor Sensor, and monitoring equipment. However, the mechanical interface still matters because incorrect mounting can affect probe clearance, alignment, and the consistency of the resulting measurement.

Before installation, the thread types, mating dimensions, sealing method, and mounting geometry should be verified. A matching internal diameter alone is not sufficient to establish compatibility.

Role in a Machinery Monitoring Architecture

The 4190-36 occupies the mechanical connection stage of a proximity measurement installation. It supports the physical mounting arrangement, while the probe and electronic components perform shaft displacement measurement and signal processing.

Machine Housing → Threaded Adapter → Probe Mounting Arrangement → Proximity Probe → Proximitor Sensor → Machinery Monitoring System

The adapter supports mechanical integration but does not replace the probe, extension cable, Proximitor Sensor, or monitoring module.

Industrial Applications

The 4190-36 is appropriate only where its thread arrangement and mounting geometry match the intended installation. Process conditions, sealing requirements, and the connected probe configuration should be assessed before use.

Installation and Maintenance

1. Verify the part number: Confirm that 4190-36 is the required adapter for the intended installation.
2. Check the internal thread: Identify whether the mating component requires the specified 1/4-18 NPT or 3/8-24 UNF-2B connection.
3. Confirm the external thread: Verify that the machine-side port or mating component accepts the 3/4-14 NPT external thread.
4. Inspect the internal bore: Check for contamination, burrs, or deformation that could interfere with the mating component.
5. Examine the threads: Look for corrosion, cross-threading, damaged thread crests, or other signs of mechanical wear.
6. Check material compatibility: Confirm that the stainless-steel adapter is suitable for the installation environment and any applicable process requirements.
7. Verify the mounting position: Ensure that the adapter permits the probe to reach its intended position without contacting the shaft or other moving parts.
8. Confirm the sealing method: Follow the approved procedure for the applicable threaded connection and installation conditions.
9. Avoid excessive tightening: Use the appropriate installation procedure to prevent thread damage or distortion of connected components.
10. Inspect the assembled connection: Check thread engagement, mechanical security, and clearance after installation.
11. Validate the probe installation: If the adapter is part of a proximity measurement channel, verify probe alignment, gap setting, cable connection, and monitoring configuration.
12. Document replacement details: Record the adapter model, thread arrangement, connected components, and inspection results for future maintenance.

If an existing adapter is difficult to remove, inspect the connection for corrosion or thread damage rather than applying uncontrolled force. Follow site isolation procedures before working on equipment near rotating shafts or pressurized process connections.

Compatible System Components

The 4190-36 is a mechanical accessory, so compatibility depends primarily on the mating threads and the required mounting arrangement. The following components may form part of the wider installation when the selected configurations are compatible.

Recommended Related Models

Key Advantages

• Accommodates the specified internal and external thread interfaces.
• Uses 304 stainless steel for industrial mounting applications.
• Provides a defined mechanical connection for compatible proximity probe installations.
• Helps simplify replacement selection through a specific part number.
• Supports maintenance and retrofit work where mounting threads must be matched.

Technical FAQs

Which internal thread connections are supported by the 4190-36?

The adapter specification lists 1/4-18 NPT and 3/8-24 UNF-2B internal thread options. The required connection must be identified before installation because these thread types are not interchangeable.

How does the 4190-36 differ from the 4190-16?

Both models have a 10.3 mm internal diameter and a 3/4-14 NPT external thread. The 4190-36 uses the listed 1/4-18 NPT and 3/8-24 UNF-2B internal thread options, whereas the 4190-16 uses a 3/8-24 UNF-2B internal thread configuration. The complete mating arrangement should be checked before selecting either adapter.

Can the 4190-36 directly measure shaft vibration?

No. It is a passive mechanical adapter. Shaft vibration measurement requires a compatible proximity probe, extension cable, Proximitor Sensor, and monitoring equipment.

What should be checked before replacing an existing 4190 adapter?

Verify the complete part number, internal and external thread types, mounting geometry, sealing method, and material suitability. Also confirm that the replacement allows the connected probe to be positioned correctly within the intended proximity measurement system.