General Information

Core Description

The CA21000-34-05-00-022-03-02 is a Bently Nevada explosion-proof aluminum probe housing assembly featuring an integrated 3300 XL 8mm proximity probe with a 0.5-meter cable and connector protector. Fully compliant with API 670 standards, this CSA Type 4 rated all-metal housing works seamlessly on industrial machinery to deliver secure external probe access, fast gap adjustments, and stable mechanical transducer protection in hazardous areas.

Features and benefits

• Secure External Probe Access: Enables field technicians to easily perform gap voltage adjustments or complete a sensor swap from outside the machine casing without requiring any disassembly of the main machinery housing.
• Explosion-Proof Hazardous Certification: Certified as a rugged CSA Type 4 enclosure, making it fully rated for hazardous industrial environments, including Class I, Division 1 and 2, Groups C and D explosive atmospheres.
• All-Metal Robust Construction: Built with a copper-free A308 aluminum body paired with an ultra-rugged 304 stainless steel sleeve, providing maximum environmental defense against high humidity and weathering.
• Integrated ClickLoc Protector: Includes a pre-installed connector protector over the internal gold-plated coax connection, delivering enhanced environmental sealing against conductive fluid or turbine oil mist contamination.

System Compatibility and Replacement Models

System Compatibility:

• Bently Nevada 3300 XL 8 mm Proximity Transducer System components (including standard 330130 extension cables and 330180 Proximitors)
• Standard industrial machinery casings and bracket targets tapped for a 3/4-14 NPT mounting thread profile
• Remote plant machinery monitors accepting standard analog eddy current proximity voltage inputs (such as Bently Nevada 3500 series racks)

Alternative Replacement Models:

• 21000-34-05-00-022-03-02 (Standard aluminum housing version with identical mechanical lengths but lacking certified explosion-proof ratings)
• CA24701-34-05-00-022-03-02 (Heavy-duty alternative version utilizing a full 303 stainless steel body structure instead of aluminum)
• Standalone 330105-02-12-05-02-05 reverse-mount proximity probe paired with a standalone 44382-067 replacement sleeve

Differences from Alternative Models:

• Hazardous Area Classification: The prefix CA designates an officially certified CSA explosion-proof rated housing, whereas the base 21000 model shares identical sizing but is restricted to non-hazardous or intrinsically safe applications utilizing external safety barriers.
• Enclosure Metallurgy Performance: The CA21000 assembly utilizes a cast aluminum body structure weighing 1.1 kg, which offers easier handling during installation. In contrast, the CA24701 series features a solid 303 stainless steel body weighing 1.8 kg, providing superior resistance to structural pitting in highly corrosive environments like offshore marine skids.
• Mechanical Installation Footprint: This customized length assembly features a 2.2-inch sleeve penetration (-022) with a zero standoff layout (-00). It is non-interchangeable with long-sleeve setups exceeding 300 mm (12 inches), which strictly require secondary internal probe support rings (P/N 37948-01) to absorb machine vibration resonances.

Ordering Information Table

Installation & Troubleshooting FAQ

Q1: How do I adjust the proximity probe gap when utilizing this external housing assembly?

A: Unscrew the threaded aluminum dome cover to expose the rear of the reverse-mount probe lead. Loosen the sleeve locknut, hook up a digital multimeter to your Proximitor’s OUT and COM terminals, and turn the main sleeve body to adjust the physical gap distance. For a standard 3300 XL 8mm system, rotate the sleeve until your multimeter reads a baseline voltage of -10.0 VDC (corresponding to the midpoint of the 2.0 mm linear range), then tighten the locknut to 11.2 N·m (100 in·lbf).

Q2: Why is the transducer signal registering high-frequency electrical noise or an unbalance glitch?

A: This configuration implements a short 2.2-inch sleeve penetration length. If the stainless steel sleeve or probe head is positioned too close to internal casing bracket walls or counterbore steps, it triggers a Side View Effect where the sensor's high-frequency RF field cross-talks with adjacent metal. Ensure that any machine casing counterbore hole diameter measures at least three times the probe tip diameter (minimum 24mm for an 8mm probe head) to eliminate physical signal dampening.

Q3: Lube oil is leaking into the external conduit lines from the housing. How can this be corrected?

A: This indicates that the internal environmental seals or thread seals have worn out or were pinched during field installation. Check the condition of the internal Viton O-rings inside the housing body assembly and ensure the outer 3/4-14 NPT pipe threads are wrapped with fresh PTFE sealant tape. If your machine runs a high oil washdown pattern, verify that the Option E:03 cable seal grip grommet is tightly compressed around the extension cable jacket to block escaping fluid migration.

Accessories

Individual Probe Sleeve for 21000/24701 Proximity Probe Housings

44382-AAA

The individual probe sleeve length does not include the distance from the end of the sleeve to the probe tip or the gap from the probe tip to the target material. If only the part number of the original housing is known, and the sleeve cannot be measured, use the following table to determine the sleeve length: