What is the 21000-28-05-00-077-03-02 ？

This assembly is used to mount a proximity probe (eddy current sensor) externally on a machine case. It allows for the measurement of shaft vibration, position, or speed on critical rotating machinery like turbines, compressors, and motors.

What kind of installation thread should be used for this 21000-28-05-00-077-03-02?

The -02 suffix indicates a 3/4-14 NPT mounting thread. This is the interface where the housing screws into your machine's bearing housing.

Does 21000-28-05-00-077-03-02 include a Roximity probe?

Yes. The -28 option includes a 3300 XL 8 mm probe with Multiple Approvals (hazardous area certifications). It comes with a 0.5-meter (-05) lead cable.

What should I set the gap voltage for 21000-28-05-00-077-03-02?

For a standard Bently Nevada 3300 XL 8 mm system, you should aim for a Bias Out voltage of -10 VDC (using a multimeter). This places the probe in the center of its linear range (approximately 80 mils).

Is the casing of model 21000-28-05-00-077-03-02 suitable for explosive environments?

Yes. The aluminum housing and the -28 probe option are rated for Explosion-proof (Class I, Div 1) and Intrinsically Safe applications. To maintain this rating, you must use certified conduit seals (pour-fittings) at the electrical entries.

21000-28-05-00-077-03-02

Name: 21000-28-05-00-077-03-02
Brand: Bently Nevada
SKU: 21000-28-05-00-077-03-02

Proximity Probe Housing Assemblies

Product image is representative; revision or series may vary. Contact us to request a specific version.

Product Describe：

3300 XL 8mm probe, selectable hazardous area approvals
0.5 m (20 in)
No standoff adapter
7.7in
One 3/4-14 NPT plug
One 3/4-14 to 1/2-14 NPT reducer
One cable seal grip with grommets for
the following cable sizes:
• 1/8 to 3/16 inches
• 1/4 to 5/16 inches
• 5/16 to 3/8 inches
3/4-14 NPT

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Technical specifications for 21000-28-05-00-077-03-02

Manufacturer:

Bently Nevada
Product Category:

Machinery Monitoring Systems
Spare Part Number:

21000-28-05-00-077-03-02
Estimated shipping dimensions:

30.5x8.5x8.5cm
Weight:

1.05 kg
Tariff Code:

8537101190
Counliy of origin:

USA
Probe with Connector:

3300 XL 8mm probe, selectable hazardous area approvals
Probe Cable Length:

0.5 m (20 in)
Standoff Adapter:

No standoff adapter
Probe Penetration:

7.7in
Fittings:

One 3/4-14 NPT plug One 3/4-14 to 1/2-14 NPT reducer One cable seal grip with grommets for the following cable sizes: • 1/8 to 3/16 inches • 1/4 to 5/16 inches • 5/16 to 3/8 inches
Mounting Thread:

3/4-14 NPT

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Information

Overview Manuals Common Applications Product Precautions

The 21000-28-05-00-077-03-02The 21000, 24701, and 164818 Proximity Probe Housing Assemblies are available with Canadian Standards Association (CSA) approvals. They are rated explosion proof for hazardous areas.

A reverse mount proximity probe
A thread seal
An optional standoff adapter

You can order hazardous area approved proximity probes with 21000 aluminum and 24701 stainless steel housings for intrinsically safe applications. Both housings are certified as CSA Type 4 enclosures and are fully compliant with the American Petroleum Institute's (API) 670 Standard for externally mounted proximity probe housings. The 164818 Compact Proximity Probe Housing is also available for applications with space restrictions. Ceramic capped probes are available with the 164818 housing. Sleeve length is determined by the location in which the probe and housing are installed. The probe lead must be longer than the sleeve. Sleeve lengths longer than 304 mm (12 inches) require additional sleeve support to reduce the vibration associated with unsupported long sleeve lengths. Bently Nevada offers a probe support and oil seal (part number 37948-01) for long sleeves that must go through an inner bearing housing. We also make custom sleeve supports.

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.

Bently Nevada 21000-28-05-00-077-03-02 Proximity Probe Housing Assemblies Manuals, Datasheets, Drivers, Link

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.

Oil & Gas

Centrifugal compressors and gas turbines used in pipeline booster stations. The long penetration depth (7.7 inches) allows it to pass through the heavy turbine housing to reach the journal.

Power Generation

Monitoring the axial displacement (thrust) and radial vibration of large steam turbine rotors. A 7.7-inch length is typically used for mounting points that need to pass through thick bearing housings or outer cylinder heads.

Petrochemical

Chemical production units typically operate continuously for several years, making the 21000 series the preferred choice due to its stability. It is used in core units such as pyrolysis gas compressors and syngas compressors.

Mining & Metallurgy

This model is typically used in large blowers that supply air to steelmaking blast furnaces, utilizing its robust aluminum casing to prevent physical damage.

This is the most important consideration for this model (-077 length). 7.7 inches is a relatively long probe sleeve; the actual distance from the mounting hole end face to the shaft surface must be measured using a depth gauge before installation. For gap voltage settings, the output voltage of the Proximitor (preamplifier) must be monitored using a multimeter. For the 3300 XL 8 mm system, the standard linear center is typically set to -10.0 VDC.

FAQ View All FAQ

What is the 21000-28-05-00-077-03-02 ？

This assembly is used to mount a proximity probe (eddy current sensor) externally on a machine case. It allows for the measurement of shaft vibration, position, or speed on critical rotating machinery like turbines, compressors, and motors.
What kind of installation thread should be used for this 21000-28-05-00-077-03-02?

The -02 suffix indicates a 3/4-14 NPT mounting thread. This is the interface where the housing screws into your machine's bearing housing.
Does 21000-28-05-00-077-03-02 include a Roximity probe?

Yes. The -28 option includes a 3300 XL 8 mm probe with Multiple Approvals (hazardous area certifications). It comes with a 0.5-meter (-05) lead cable.

What should I set the gap voltage for 21000-28-05-00-077-03-02?

For a standard Bently Nevada 3300 XL 8 mm system, you should aim for a Bias Out voltage of -10 VDC (using a multimeter). This places the probe in the center of its linear range (approximately 80 mils).
Is the casing of model 21000-28-05-00-077-03-02 suitable for explosive environments?

Yes. The aluminum housing and the -28 probe option are rated for Explosion-proof (Class I, Div 1) and Intrinsically Safe applications. To maintain this rating, you must use certified conduit seals (pour-fittings) at the electrical entries.

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