21000-00-00-00-042-03-02 | Bently Nevada Proximity Probe Housing Assembly

Introduction to the 21000-00-00-00-042-03-02

When hazardous area monitoring demands robust protection, the 21000-00-00-00-042-03-02 from Bently Nevada delivers a reliable solution. This proximity probe housing assembly is part of the 21000 series and is engineered for external mounting per API 670 standards. Its aluminum body with a 304 stainless steel sleeve ensures durability in harsh environments.

Key Features and Technical Specs

• Probe Penetration: 4.2 inches (042 suffix)
• Mounting Thread Option: 03 includes two plugs, one 3/4-14 NPT fitting, one 3/4-14 to 1/2-14 NPT SST reducer, and cable seal grip with grommets for cables 1/8 to 3/8 inches
• Alternate Mounting Thread: 02 specifies 3/4-14 NPT (required with standoff adapter)
• Material: Aluminum body with 304 stainless steel sleeve
• Weight: 1.1 kg (2.4 lb) typical, without fittings
• CSA Certification: Explosion-proof for Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, Class III, Enclosure Type 4
• Temperature Ratings: T5 @ Ta = -50°C to +40°C; T4 @ Ta = -50°C to +80°C
• RoHS Compliance: Directive 2011/65/EU

A distinctive feature of the 21000-00-00-00-042-03-02 is its 4.2-inch probe penetration, which allows precise positioning in thick-walled vessels or piping. This spec directly impacts installation flexibility in crowded machinery trains.

Applications and Use Cases

This housing assembly is ideal for vibration and position monitoring in rotating machinery such as turbines, compressors, and pumps. Furthermore, its CSA explosion-proof rating makes it suitable for oil and gas refineries, chemical plants, and other hazardous locations. Consequently, engineers can deploy it in Class I Division 1 areas without additional enclosure modifications.

Installation and Setup

Mounting the 21000-00-00-00-042-03-02 requires selecting the appropriate thread option. The 03 option provides a 3/4-14 NPT fitting plus a reducer and cable seal grip for various cable diameters. Alternatively, use the 02 option if a standoff adapter is needed. Ensure the probe sleeve penetrates exactly 4.2 inches into the housing for optimal sensing.

Maintenance and Reliability

Regular inspection of O-rings and thread seals helps maintain the explosion-proof integrity. Additionally, verify that the cable seal grip remains tight to prevent moisture ingress. Following these steps extends service life and reduces unplanned downtime.

Compatibility and Integration

The 21000-00-00-00-042-03-02 accepts reverse mount proximity probes (ordered separately) and is fully compliant with API 670 for externally mounted housings. It integrates with Bently Nevada monitoring systems and third-party equipment through standard NPT conduit connections.

FAQs about the 21000-00-00-00-042-03-02

What is the probe penetration length of this housing?

The 042 suffix indicates a probe penetration of 4.2 inches.

What mounting thread options are available?

Option 03 includes a 3/4-14 NPT fitting, reducer, and cable seal grip. Option 02 is 3/4-14 NPT required for standoff adapters.

Is this housing certified for hazardous areas?

Yes, it is CSA certified explosion-proof for 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 materials are used in construction?

The body is aluminum with a 304 stainless steel sleeve.

What is the typical weight without fittings?

1.1 kg (2.4 lb).

Product Support and Availability

The 21000-00-00-00-042-03-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for lead times and bulk pricing.