21000-28-10-30-095-03-02 Bently Nevada Housing Assembly Proximity

Product Overview

The 21000-28-10-30-095-03-02 is an industrial-grade proximity probe housing assembly engineered by Bently Nevada within the trusted 21000 product series. Designed to protect reverse-mount proximity transducers in harsh environments, this assembly features a rugged aluminum body integrated with a 304 stainless steel sleeve. It ensures reliable mechanical protection and electrical isolation for critical machinery monitoring loops.

Configuration Breakdown & Suffix Codes

• Base Model: 21000 Proximity Probe Housing Assemblies
• Probe Option (28): 3300 XL 8 mm probe with hazardous area approvals
• Cable Length (10): 1.0 m (39 in) probe cable configuration
• Standoff Adapter (30): 3-inch standoff extension length
• Probe Penetration (095): 9.5 inches total penetration depth
• Fitting Option (03): Includes one 3/4-14 NPT plug, one 3/4 to 1/2-14 NPT reducer, and multi-range cable seal grip grommets
• Mounting Thread (02): 3/4-14 NPT standard connection thread

Technical Specifications

• Brand: Bently Nevada
• Manufacturer Part Number: 21000-28-10-30-095-03-02
• Housing Material: Aluminum body with 304 stainless steel sleeve
• Weight: 1.1 kg (2.4 lb) typical excluding conduit fittings
• Maximum Dimension: Up to 32.9 inches (83.5 cm) total assembled length
• Enclosure Rating: CSA Type 4, explosion-proof
• Compliance: API 670 Standard compliant, RoHS Directive 2011/65/EU

Certifications & Hazardous Area Ratings

• North America (CSA): Class I, Divisions 1 and 2, Groups C and D; Class II, Divisions 1 and 2, Groups E, F, and G; Class III
• Temperature Classifications: T5 at Ta = -50°C to +40°C; T4 at Ta = -50°C to +80°C
• Circuit Design: Non-incendive when wired according to installation drawing 140979

Packaging List & Commercial Terms

• One complete 21000-28-10-30-095-03-02 housing assembly unit
• Dome cover, internal reverse-mount probe, and thread seals
• Fittings package including NPT plugs, reducers, and cable seal grips
• Warranty: Full 12-month factory defect coverage
• Fulfillment: Express global delivery via FedEx, UPS, and DHL within 24-48 hours

Target Machinery & Application Scenarios

• Critical steam, gas, and hydro turbine generator bearing housings.
• High-pressure centrifugal and axial industrial compressors.
• Large multi-stage boiler feed pumps and heavy-duty gearboxes.
• Hazardous-zone petrochemical processing rotating equipment.

Diagnostic Capability

• Enables continuous offline and online vibration and shaft relative position tracking.
• Protects sensitive internal probe tips against process fluid contamination and physical shock.
• Maintains constant gapping parameters to prevent false signal spikes during thermal growth transients.

Global PLC Spare HUB's Insight

When mounting the 21000-28-10-30-095-03-02 on high-vibration compressor casings, field engineers must apply approved thread sealant to all NPT conduit ports to prevent moisture ingress. Ensuring proper torque on the dome cover O-ring is essential to maintain the CSA Type 4 explosion-proof integrity in outdoor or offshore processing units.

Model Selection and Comparison Analysis

When selecting between housing variants, engineers must evaluate penetration depth and standoff requirements based on machine casing clearance. For instance, comparing the current unit with the alternative model 21000-16-10-00-144-03-02 Bently Nevada Housing Assembly reveals distinct differences: the alternative model features a shorter 0-inch standoff adapter and a longer 14.4-inch penetration with a 5mm probe option (code 16), whereas the 21000-28-10-30-095-03-02 utilizes an 8mm probe (code 28) with a 3-inch standoff and a 9.5-inch penetration. Select the 3-inch standoff variant when thermal insulation thickness on the machine casing requires extra clearance to keep the terminal blocks within safe operating temperature limits.

Frequently Asked Questions

Question: Can this assembly be installed in European hazardous zones?

Answer: No. The CA-designated housing versions carrying specific CSA explosion-proof markings are restricted strictly to North American installations.

Question: What purpose does the 3-inch standoff adapter serve?

Answer: The standoff adapter elevates the housing further away from hot machine casings, protecting internal electronics from excessive thermal transfer.

Question: How do I select the correct cable gland grommet?

Answer: Match your external field cable outer diameter against the three provided size brackets (1/8 to 3/16, 1/4 to 5/16, or 5/16 to 3/8 inches) included in the fitting option.

Question: Is recalibration required when replacing the internal probe?

Answer: Because the system is matched to an AISI 4140 steel target, ensure component serial numbers and probe tip configurations align precisely with original factory calibration sheets.

Question: What is the primary advantage of combining aluminum bodies with stainless steel sleeves?

Answer: This hybrid construction delivers lightweight structural rigidity while offering superior corrosion resistance at the probe penetration interface.

Buying Guide

• Verify your machine's mechanical clearance dimensions to confirm that the 9.5-inch penetration and 3-inch standoff match your mounting port geometry.
• Ensure your facility falls under North American regulatory frameworks if deploying CSA-certified explosion-proof variants.
• Select expedited courier delivery via DHL or FedEx to prevent project staging delays during scheduled plant turnarounds.

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