Bently Nevada 21000-00-00-00-015-04-02 Proximity Probe Housing Assembly

Description

21000-00-00-00-015-04-02: Bently Nevada 21000 series aluminum proximity probe housing assembly configured with Option 00 (no probe), Option 00 (no probe cable), Option 00 (no standoff adapter), Option 015 (1.5-inch probe penetration length), Option 04 (one 3/4-14 NPT plug), and Option 02 (3/4-14 NPT mounting thread).

This configuration utilizes a lightweight aluminum housing body rather than the stainless steel used in 24701 models. It is designed to allow standard or custom reverse-mount proximity probes to be field-installed. The integration of a machined 3/4-14 NPT mounting thread and a single 3/4-14 NPT plug allows robust installation on rotating machinery casings, keeping the probe penetration at a fixed 1.5 in (38 mm) sleeve length while maintaining Type 4 enclosure protection.

Features

• Aluminum housing construction providing a lightweight enclosure (typical 1.1 kg weight without fittings) for external probe mounting.
• Option A:00 configuration delivered without a pre-installed probe, allowing flexible field installation of various reverse-mount probes.
• Option C:00 design containing no standoff adapter for compact, direct-to-case mounting applications.
• Option D:015 sleeve length providing 1.5 in (38 mm) of probe penetration to suit shallow-depth immersion profiles.
• Option E:04 fitting selection containing one 3/4-14 NPT plug with no additional explosion-proof fittings.
• Option F:02 mounting thread featuring a machined 3/4-14 NPT connection designed to increase thread engagement and rigidity.
• Compliant with API 670 standards for externally mounted proximity probe housings.

Applications

This proximity probe housing assembly is used in heavy-duty machinery protection systems to support non-contact vibration and position measurements. Typical applications include:

• Shaft vibration and axial position measurement on critical rotating machinery.
• External mounting of reverse-mount proximity probes on gearboxes, turbines, compressors, and pumps.
• Heavy-industry installations such as oil and gas, petrochemicals, power generation, and wastewater treatment where Type 4 / Class I Division 1 and 2 protection is desired.

Ordering Information

Technical Specifications

Installation Guidelines

• Mount the assembly on a flat, machined surface to ensure proper alignment of the proximity probe.
• Utilize the 3/4-14 NPT mounting threads (Option F:02) to secure the housing body to the machine casing, ensuring approximately 5 to 7 full threads of engagement to maximize stiffness and prevent resonance.
• Keep the 1.5 in (38 mm) probe penetration sleeve clear of any internal machine components. Ensure the nominal gap of the probe (when field-installed) is adjusted using Option D's adjustment range of +/- 13 mm (+/- 0.5 in).
• Install the provided 3/4-14 NPT plug (Option E:04) in the unused conduit port to prevent ingress of moisture or contaminants.
• Ensure appropriate thread sealant is applied to the mounting and conduit threads to maintain Type 4 enclosure ratings.

Compliance and Certifications

• CSA: Certified 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; Class III).
• RoHS: Complies with European Community Directive 2011/65/EU.
• API 670: Fully compliant with American Petroleum Institute (API) 670 Standard for externally mounted proximity probe housings.
• Enclosure Protection: Type 4 rating.