Product Overview

The Bently Nevada 21022-29-10-017-03 is a Dual Axial Probe Housing Assembly. Specifically, this assembly consists of two proximity probes installed in an externally mounted protective enclosure.

The enclosure mounts on the machine case using four standard machine screws. Meanwhile, the probes are mounted in sleeve/adapter assemblies. Furthermore, these assemblies install directly onto the machine case through two 3/4-in NPT threaded holes. As a result, this assembly provides robust protection for thrust position monitoring.

Ordering Information Breakdown

The 21022-29-10-017-03 follows a specific ordering code structure. Understanding this code helps verify correct configuration.

• 21022: Dual Axial Probe Housing Assembly base model.

• 29: 3300 XL 11 mm probe with connector.

• 10: 1.0 metre (39 inch) probe cable length.

• 017: 1.7 inch probe penetration.

• 03: Two cable seal grips with grommets and two 3/4-14 to 1/2-14 NPT reducers (supplied as a kit, not installed).

Important Note: The 3300 XL 11 mm Probe is not available with the 0.5 meter Probe Cable Length. Therefore, the 1.0 metre option is the minimum for this probe type.

General Specifications

The 21022-29-10-017-03 offers reliable thrust position monitoring for critical machinery. Below are the core technical details.

• Manufacturer: Bently Nevada.

• Product Type: Dual Axial Probe Housing Assembly.

• Country of Origin: Made in U.S.A.

Material:

• Housing: Aluminum alloy housing (sand cast, 0.3% copper free).

• Sleeves: Fabricated from 304 stainless steel.

Weight:

• 3.6 kg (8 lb).

Intended Application

The 21022-29-10-017-03 is intended for mounting on the end of a machine nearest the thrust bearing. Consequently, both probes can observe the end of the shaft for axial thrust position movement. Moreover, this arrangement provides redundant measurement for critical thrust monitoring. Thus, it enhances machinery protection.

API 670 Compliance

The dual axial position housing meets the American Petroleum Institute's (API) 670 Standard for axial thrust position transducer housings. As a result, it is suitable for critical turbomachinery applications requiring API compliance. Furthermore, this certification simplifies acceptance by end users.

Key Features

The 21022-29-10-017-03 offers several advantages for thrust position monitoring.

External Mounting Design:
The external mounting allows probe adjustments from outside the machine. Therefore, gaps can be set without opening the machine case. Consequently, maintenance is faster and safer.

Protective Enclosure:
The enclosure protects the proximity probes, probe leads, and extension cables from dust, splashing liquid, or other environmental factors. Hence, long-term reliability is significantly improved.

Removable Cover:
A removable cover on the enclosure provides access for setting the probe gaps. For this reason, routine maintenance does not require full disassembly.

Dual Probe Configuration:
Two probes observe the same shaft end for axial thrust position movement. This provides redundancy and allows voting logic in safety systems. As a result, false trips are reduced.

API 670 Standard Compliance:
Meets the standard for axial thrust position transducer housings. Therefore, it is accepted for API-compliant machinery protection systems worldwide.

Fittings Information

Fittings option 03 includes two cable seal grips with grommets for various cable sizes. Specifically, these accommodate 1/8-in to 3/16-in, 1/4-in to 5/16-in, and 5/16-in to 3/8-in cables. Additionally, two 3/4-14 to 1/2-14 NPT reducers are supplied.

These fittings are supplied as a kit. Importantly, they are not installed when the housing is shipped. Therefore, field installation is required before the assembly can be used.

Typical Applications

The 21022-29-10-017-03 suits various thrust position monitoring applications.

• Axial thrust position monitoring on large steam turbines.

• Thrust bearing wear detection on gas compressors.

• Shaft position measurement on hydro turbines.

• API 670 compliant machinery protection systems.

• Redundant thrust measurement on critical rotating equipment.

Installation Guidelines

Install the 21022-29-10-017-03 on the end of the machine nearest the thrust bearing. First, mount the enclosure on the machine case using four standard machine screws (not supplied). Then, install the sleeve/adapter assemblies directly onto the machine case through two 3/4-in NPT threaded holes.

The probes are mounted in sleeve/adapter assemblies. After that, install the fittings from the supplied kit. Remember that these are supplied as a kit and require field installation. Use the appropriate cable seal grip for your cable diameter.

Set the probe gaps using the removable cover. The 3300 XL 11 mm probe has a 1.0 metre cable length. Finally, connect the probe to an extension cable and Proximitor Sensor per standard 3300 XL practices.

What is in the Box

Please inspect all items upon delivery.

• Bently Nevada 21022-29-10-017-03 dual axial probe housing assembly.

• Aluminum alloy housing with 304 stainless steel sleeves.

• Two 3300 XL 11 mm proximity probes with 1.0m cables.

• Two cable seal grips with grommets (kit, not installed).

• Two 3/4-14 to 1/2-14 NPT reducers (kit, not installed).

• Removable cover for gap access.

• Installation instruction manual.

Frequently Asked Questions (FAQ)

1. What probes are included with the 21022-29-10-017-03?

The 21022-29-10-017-03 includes two 3300 XL 11 mm proximity probes. Specifically, the -29 option specifies this probe type.

2. What is the probe cable length for this assembly?

The probe cable length is 1.0 metre (39 inches). The -10 option specifies this length. Note that 3300 XL 11 mm probes are not available with the 0.5 metre cable length.

3. Does this housing meet API standards?

Yes. The 21022-29-10-017-03 meets the American Petroleum Institute's (API) 670 Standard for axial thrust position transducer housings. Therefore, it is suitable for API-compliant installations.

4. What fittings are included with this option?

The -03 fittings option includes two cable seal grips with grommets and two 3/4-14 to 1/2-14 NPT reducers. These are supplied as a kit and are not installed when the housing is shipped.

5. What is the weight of this assembly?

The 21022-29-10-017-03 weighs 3.6 kg (8 lb). The housing is made of aluminum alloy with 304 stainless steel sleeves.