21000-28-10-20-030-03-02 | Bently Nevada 8 mm Probe Housing Assembly

Introduction to the 21000-28-10-20-030-03-02

When machinery vibration monitoring demands robust protection, the 21000-28-10-20-030-03-02 from Bently Nevada delivers a durable solution. This proximity probe housing assembly is part of the 21000 series, engineered for hazardous area applications. It combines an aluminum body with a 304 stainless steel sleeve for corrosion resistance and long service life. By reducing unplanned downtime, this housing helps lower maintenance costs over time.

Key Features and Technical Specifications

• The 21000-28-10-20-030-03-02 uses a 3300 XL 8 mm probe with selectable hazardous area approvals.
• Probe cable length is 1.0 m (39 in), minimizing signal loss and installation complexity.
• Standoff adapter length is 2 in, ensuring proper probe positioning.
• Probe penetration is 3 in, suitable for standard bearing housings.
• Mounting thread is 3/4-14 NPT, a common industrial standard that simplifies retrofits.
• Fittings include one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with grommets for cable sizes from 1/8 to 3/8 inches.
• Weight is 1.1 kg (2.4 lb) typical without fittings, reducing shipping costs.
• CSA certified as Type 4 enclosure for explosion-proof areas: Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, Class III, with T5 @ Ta = -50°C to +40°C and T4 @ Ta = -50°C to +80°C.

The distinctive 8 mm probe size allows precise gap measurements, which directly improves machine protection and reduces false trips—saving thousands in production losses.

Cost-Effective Applications and Use Cases

In petrochemical plants, the 21000-28-10-20-030-03-02 monitors shaft vibration in compressors and turbines. Its explosion-proof rating eliminates the need for additional purging systems, cutting installation costs. For refineries, the housing's compliance with API 670 standard ensures reliable operation in harsh environments. By extending sensor life, this assembly reduces replacement frequency and associated labor expenses.

Installation and Setup Guidance

Mount the housing using the 3/4-14 NPT thread directly into a standard port. Ensure the cable seal grip matches the cable diameter—grommets accommodate 1/8 to 3/8 inches. The standoff adapter (2 in) positions the probe at the correct gap. For hazardous areas, connect per drawing 140979 to maintain non-incendive circuit integrity. Always verify probe clearance before final tightening to avoid mechanical damage.

Maintenance and Reliability

Periodically inspect the O-rings and thread seal for wear to maintain enclosure integrity. The aluminum body and stainless steel sleeve resist corrosion, reducing maintenance intervals. In extreme temperatures (-50°C to +80°C), the housing maintains its T4 rating, ensuring continuous operation. This reliability translates to lower total cost of ownership compared to non-certified alternatives.

Compatibility and Integration

The 21000-28-10-20-030-03-02 works with Bently Nevada 3300 XL 8 mm proximity probes and compatible monitoring systems. Its CSA Type 4 enclosure integrates into existing hazardous area installations without modification. The 1.0 m cable length suits most machinery layouts, minimizing extension cable needs.

Frequently Asked Questions

What is the probe cable length for the 21000-28-10-20-030-03-02?

The probe cable length is 1.0 m (39 in).

What mounting thread does this housing use?

It uses a 3/4-14 NPT mounting thread.

Is this housing certified for hazardous areas?

Yes, it is CSA certified as Type 4 for explosion-proof areas including Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, and Class III.

What is the weight of the 21000-28-10-20-030-03-02?

Typical weight is 1.1 kg (2.4 lb) without fittings.

What materials are used in this housing?

The body is aluminum with a 304 stainless steel sleeve.

Product Support and Availability

The 21000-28-10-20-030-03-02 is available as new and original in factory packing from Petro Auto Tech. It comes with a 12-month factory warranty. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.