21000-34-05-30-028-04-02 | Bently Nevada 0.5m Cable Proximity Probe Housing Assembly

What Is the 21000-34-05-30-028-04-02?

When machinery vibration threatens uptime, the 21000-34-05-30-028-04-02 from Bently Nevada offers a robust solution. This proximity probe housing assembly is part of the 21000 series, designed for externally mounted probes in hazardous areas. It includes an aluminum body with a 304 stainless steel sleeve, ensuring durability in industrial environments. The assembly comes with a 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals, and a 0.5 m (20 in) probe cable. With a standoff adapter of 3.0 in and probe penetration of 2.8 in, it fits many mounting configurations. The 3/4-14 NPT mounting thread option simplifies installation. This unit is new and original in factory packing, backed by a 12-month warranty.

Key Features & Technical Specs

• Probe Type: 3300 XL 8 mm probe with connector protector.
• Cable Length: 0.5 m (20 in) probe cable.
• Standoff Adapter: 3.0 in length.
• Probe Penetration: 2.8 in.
• Fitting Option: One 3/4-14 NPT plug only.
• Mounting Thread: 3/4-14 NPT.
• Material: Aluminum body with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Maximum (C) + (D) Dimension: 13.5 in (34.3 cm).

A distinctive spec is the 0.5 m cable length, which suits tight installations where shorter leads reduce signal loss and simplify routing. This design enhances reliability in vibration monitoring systems.

Industry Applications

In rotating machinery like pumps, compressors, and turbines, the 21000-34-05-30-028-04-02 provides critical vibration data. It is CSA Type 4 rated and explosion-proof for hazardous areas, making it ideal for oil and gas, petrochemical, and power generation plants. The assembly complies with API 670 standards, so engineers trust it for safety-critical monitoring. For example, in a refinery, this housing can withstand harsh conditions while delivering accurate proximity measurements.

Installation & Setup

Mounting the assembly requires a 3/4-14 NPT threaded port. Use the included standoff adapter to set the probe gap correctly. The probe sleeve of optional length allows adjustment for different machine depths. Ensure the O-rings are seated properly to maintain the CSA Type 4 enclosure seal. For hazardous area installations, follow local codes and use explosion-proof fittings as needed. The visible probe P/N and S/N are not visible after installation, so record them beforehand.

Maintenance & Reliability

Regular inspection of the housing and probe cable prevents downtime. Check for corrosion on the aluminum body or stainless steel sleeve, especially in wet environments. Verify the O-rings remain intact to keep the enclosure rating. The 0.5 m cable reduces wear from vibration, extending service life. From a cost-benefit perspective, this assembly minimizes false trips and unplanned maintenance, saving money over time.

Compatibility & Integration

The 21000-34-05-30-028-04-02 works with Bently Nevada monitoring systems that accept 8 mm proximity probes. It integrates with vibration analyzers and protection relays. The CSA approvals ensure compatibility with intrinsically safe barriers in hazardous zones. No special protocols are needed, as it is a passive probe assembly.

FAQs about 21000-34-05-30-028-04-02

Q: What is the probe cable length for this model?

A: The probe cable length is 0.5 m (20 in), as specified by suffix code 05.

Q: Is this housing explosion-proof?

A: Yes, it is rated explosion-proof by CSA when ordered with appropriate options, and the housing is CSA Type 4 certified.

Q: What material is the sleeve made of?

A: The sleeve is 304 stainless steel, while the body is aluminum.

Q: What mounting thread does it use?

A: It uses a 3/4-14 NPT mounting thread, which is required when the standoff adapter is not -00.

Q: What is the weight of this assembly?

A: The typical weight is 1.1 kg (2.4 lb) without fittings.

Product Support & Availability

The 21000-34-05-30-028-04-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for pricing and lead times. We provide factory warranty and original packaging.