Bently Nevada 21000-28-05-40-025-03-02 Proximity Probe HousingAssemblies

Item Overview

This module is a 21000 Series Aluminum Proximity Probe Housing Assembly (model 21000-28-05-40-025-03-02) designed for externally mounting a proximity probe (e.g., 3300 XL 8 mm probe) onto rotating machinery such as compressors, turbines, or pumps. It enables probe installation, gap adjustment, and replacement without disassembling the machine.

Performance Specifications

Material：

Aluminum body with 304 stainless steel sleeve

Weight:

1.1 kg (2.4 lb) typical, without fittings

Probe Option, With Connector:

28

3300 XL 8 mm probe, multiple approvals

Probe Cable Length :

05

0.5 metre (20 in)

Standoff Adapter:

40

4.0 in = 4 0

Probe Penetration:

025

2.5 in = 0 2 5

Fittings:

03

One 3/4-14 NPT plug; one 3/4- 14 to 1/2-14 NPT reducer; one cable seal grip with grommets for cable sizes: 1/8 to 3/16, 1/4 to 5/16, and 5/16 to 3/8-in

Mounting Thread:

02

3/4-14 NPT (Must be ordered if Standoff Adapter Length Option is not-00.)

Application

 External mounting of proximity probes – Allows installation of a reverse-mount proximity probe (e.g., 3300 XL 8 mm) onto rotating machinery such as compressors, steam turbines, gas turbines, and pumps.

 Vibration monitoring – Enables radial vibration measurement on fluid-film bearing machines when used with a compatible Proximitor sensor and extension cable.

 Differential expansion measurement – Measures relative thermal growth between rotor and stator in turbines and large compressors.

 21000 aluminum housing – Lightweight (1.1 kg typical), suitable for general industrial environments.

 Probe option 28 – Includes a 3300 XL 8 mm probe with multiple approvals (CSA/BASEEFA) for hazardous area use.

 Standoff adapter – Provides additional offset from machine case when needed.

 Fittings – Includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip for various cable diameters.

FAQ

Question

Answer

Q1：What is the housing material?

A1: Aluminum body (21000 series) with 304 stainless steel sleeve.

Q2：When is additional sleeve support required?

A2: Sleeve length exceeding 304 mm (12 in) requires support/oil seal (P/N 37948-01).

Q3：Can the probe be replaced without machine disassembly?

A3: Yes, the housing allows external access for probe replacement and gap adjustment.

Q4：Does the housing include a standoff adapter?

A4: Yes, 025 = 2.5 inches (63.5 mm) standoff adapter length.

Q5：Is the housing API 670 compliant?

A5: Yes, fully compliant with API 670 Standard for externally mounted probe housings.

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