21000-28-05-00-077-03-02 | Bently Nevada 8mm Probe Housing

21000-28-05-00-077-03-02: Bently Nevada Proximity Probe Housing Assembly

Product Introduction

The 21000-28-05-00-077-03-02 from Bently Nevada represents a versatile externally mounted proximity probe housing solution. Specifically, this assembly incorporates a reverse-mount 3300 XL 8 mm probe with hazardous area approvals, a 7.7-inch penetration depth, and a compact 0.5-meter cable. Furthermore, the absence of a standoff adapter makes this configuration particularly suitable for installations with limited clearance. Additionally, the housing meets CSA Type 4 and API 670 standards, ensuring dependable performance in demanding rotating machinery applications. This listing offers a brand new unit in original factory packaging, and we back it with a full 12-month warranty.

Ordering Code Breakdown

The 21000 series uses a systematic suffix code structure, and this particular unit (21000-28-05-00-077-03-02) breaks down as follows:

Detailed Technical Specifications

Probe Option (Suffix 28): This assembly includes a 3300 XL 8 mm probe that features selectable hazardous area approvals. This probe provides exceptional linear range and stability, making it a preferred choice for critical machinery protection systems worldwide.

Probe Cable Length (Suffix 05): The unit comes with a 0.5 m (20 inches) integral cable. This shorter length proves advantageous for installations where the connection point sits nearby, minimizing signal degradation and simplifying cable management.

Standoff Adapter (Suffix 00): This configuration omits the standoff adapter entirely. Therefore, the probe mounts directly, which works ideally when space constraints exist or when the required probe penetration does not need an adapter.

Probe Penetration (Suffix D=077): The probe penetration length stands at 7.7 inches. Meanwhile, the adjustment range for option D spans ±0.5 inches (13 mm), providing necessary flexibility for precise positioning during installation.

Fittings (Suffix 03): Included fittings consist of one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip. Moreover, the seal grip comes with three interchangeable grommets that accommodate cable diameters from 1/8 inch up to 3/8 inch.

Mounting Thread (Suffix 02): The housing features a standard 3/4-14 NPT mounting thread. This thread size enjoys wide adoption across industrial applications, ensuring compatibility with most existing mounting holes and adapters.

Materials and Construction

The 21000 housing body uses lightweight yet durable aluminum. Simultaneously, the probe sleeve utilizes 304 stainless steel, offering excellent resistance to corrosion and mechanical wear. This material combination ensures long service life even in harsh environmental conditions.

Mechanical and Environmental Ratings

• Enclosure Rating: CSA Type 4, providing protection against water ingress and dust

• Hazardous Area Approvals: Class I Divisions 1 and 2 Groups C and D; Class II Divisions 1 and 2 Groups E, F, and G; Class III

• Temperature Ratings: T5 at Ta = -50°C to +40°C; T4 at Ta = -50°C to +80°C

• Weight: Approximately 1.1 kg (2.4 lb) without fittings

• Circuit Classification: The circuit operates as non-incendive when you connect it per drawing 140979

Installation Guidance

Properly mounting the 21000-28-05-00-077-03-02 ensures accurate vibration and position measurements. First, confirm that the mounting surface is clean and prepare the 3/4-14 NPT thread with sealant. Next, carefully insert the assembly while avoiding any contact between the probe tip and the target surface, as contact could damage the probe.

For this particular model, the probe penetration length measures 7.7 inches, which falls within the standard range. However, remember that the maximum C plus D dimension for a 0.5 m cable reaches 13.5 inches. Since this configuration remains well below that threshold, you do not need additional sleeve support. Additionally, the probe P/N and S/N will not appear on a flag label for this cable length, so verify these details on the probe body before installation.

Compliance and Certifications

The 21000 series complies with the European Community RoHS Directive 2011/65/EU, ensuring it meets global environmental standards. Furthermore, the housing carries CSA certification for explosion-proof applications across North America. Importantly, it fully satisfies the American Petroleum Institute's (API) 670 Standard for externally mounted proximity probe housings. CA housings specifically serve North American end users, while standard 21000 housings serve all other regions.

Packaging List

Each new 21000-28-05-00-077-03-02 order includes the following components in original factory packaging:

• One complete housing assembly with aluminum body and 304 stainless steel sleeve

• One 3300 XL 8 mm reverse-mount proximity probe with selectable hazardous area approvals

• One 0.5 m integral probe cable

• One 3/4-14 NPT plug

• One 3/4-14 to 1/2-14 NPT reducer

• One cable seal grip with three grommets (1/8 to 3/16 inches, 1/4 to 5/16 inches, 5/16 to 3/8 inches)

• One dome cover

• Thread seal compound

• O-rings

Shipping Information

We dispatch all orders through trusted global carriers, including FedEx, UPS, and DHL. We carefully pack each 21000 housing assembly to prevent damage during transit. You will receive tracking details as soon as your order ships.

Frequently Asked Questions (FAQ)

Q1: What is the difference between suffix 16 and suffix 28 probe options?
Both options use a 3300 XL 8 mm probe, but suffix 28 includes selectable hazardous area approvals. This makes the 21000-28-05-00-077-03-02 suitable for intrinsically safe installations in explosive environments, while suffix 16 serves standard non-hazardous area applications.

Q2: Why does this model have no standoff adapter (suffix 00)?
The suffix 00 option means we exclude the standoff adapter. This arrangement works ideally when the required probe penetration can be achieved without additional length, or when space limitations prevent using an adapter. The mounting thread defaults to 02 when you do not specify the standoff adapter.

Q3: Can this housing be used in international locations outside North America?
Yes, absolutely. The standard 21000 housing (without the CA prefix) serves users worldwide. Only the CA21000 variant carries restrictions for North American end users. Therefore, this 21000-28-05-00-077-03-02 fits installations globally.

Q4: How do I adjust the probe penetration during installation?
The probe penetration option D offers an adjustment range of ±0.5 inches (13 mm). You can fine-tune this by rotating the housing or adjusting the mounting position. Always perform adjustments with the machine stopped and follow Bently Nevada's recommended procedures to maintain measurement accuracy.

Q5: Does this assembly require additional sleeve support?
For the 21000-28-05-00-077-03-02, the total C plus D dimension stands at 7.7 inches, well below the 12-inch threshold. Consequently, you do not need additional sleeve support. However, always verify your specific installation conditions to ensure optimal performance.