Product Overview
The Bently Nevada 21000-28-05-00-092-03-02 is a robust proximity probe housing assembly designed for demanding industrial environments. This model combines an aluminum body with a 304 stainless steel sleeve, offering durability and corrosion resistance. It is part of the 21000 series, engineered to protect and house reverse mount proximity probes, ensuring reliable vibration and position monitoring in rotating machinery.
With a 0.5 m (20 in) probe cable and a probe penetration of 9.2 inches, this assembly is suitable for installations where precise gap setting and stable mounting are critical. The housing is certified as a CSA Type 4 enclosure, rated explosion-proof for hazardous areas, and fully compliant with the American Petroleum Institute's (API) 670 Standard for externally mounted proximity probe housings.
Key Features & Specifications
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Model: 21000-28-05-00-092-03-02
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Probe Option: 28 – 3300 XL 8 mm probe, selectable hazardous area approvals
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Probe Cable Length: 05 – 0.5 m (20 in)
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Probe Penetration: 092 – 9.2 inches
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Fitting Option: 03 – Includes 3/4-14 NPT plug, 3/4-14 to 1/2-14 NPT reducer, and cable seal grip with grommets for cable sizes: 1/8 to 3/16 in, 1/4 to 5/16 in, 5/16 to 3/8 in
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Mounting Thread Option: 02 – 3/4-14 NPT
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Material: Aluminum body with 304 stainless steel sleeve
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Maximum (C) + (D) Dimension: 13.5 in (34.3 mm) – with cable length 0.5 m, probe P/N and S/N not visible
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Weight: 1.1 kg (2.4 lb) typical, without fittings
Technical Specifications
| Specification |
Value |
| Probe Cable Length |
0.5 m (20 in) |
| Probe Penetration |
9.2 in |
| Fitting Option |
03 – NPT plug, reducer, cable seal grip |
| Mounting Thread |
3/4-14 NPT |
| Material |
Aluminum body with 304 stainless steel sleeve |
| Max (C) + (D) Dimension |
13.5 in (34.3 mm) |
| Weight |
1.1 kg (2.4 lb) typical |
The housing is certified by CSA for explosion-proof applications in North America: Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, and Class III. The circuit is non-incendive when connected per drawing 140979. Temperature ratings are T5 @ Ta = -50°C to +40°C and T4 @ Ta = -50°C to +80°C.
Installation & Setup Guidance
Proper installation is critical for accurate measurements. Ensure the mounting thread (3/4-14 NPT) is clean and free of debris. When installing the housing, tighten the dome cover securely to maintain the explosion-proof seal. The cable seal grip should accommodate your cable diameter; select the appropriate grommet size from the provided set (1/8-3/16 in, 1/4-5/16 in, or 5/16-3/8 in).
Position the probe so that the tip achieves the recommended gap for your application. Use the probe penetration dimension (9.2 in) to verify correct insertion depth. For hazardous area installations, follow all local regulations and ensure the housing is properly grounded.
Maintenance & Reliability
Regular inspection of the housing and probe is recommended to ensure long-term reliability. Check for any signs of wear on the O-rings and thread seal. Verify that all fittings remain tight and that the cable seal grip maintains a proper seal. Clean the exterior with a mild solvent if needed, but avoid abrasive materials that could damage the aluminum surface.
The 21000-28-05-00-092-03-02 is designed for minimal maintenance, reducing downtime and operational costs. Its robust construction and CSA Type 4 rating provide protection against dust, water, and corrosive environments, extending service life.
Applications
This housing assembly is ideal for monitoring vibration and shaft position in critical rotating equipment such as turbines, compressors, and pumps. It is particularly suited for applications in oil and gas, petrochemical, and power generation industries where hazardous area classifications are present. The API 670 compliance ensures it meets industry standards for externally mounted proximity probes.
Selection Guide
When ordering, verify that the model number 21000-28-05-00-092-03-02 matches your requirements. Confirm the probe cable length (0.5 m) and fitting options are correct for your installation. The 3/4-14 NPT mounting thread is standard; if you require a different thread, consult the options. PLC Source PRO offers this product new and in original factory packing, backed by a 12-month factory warranty.