Bently Nevada 21000 Proximity Probe Housing Assembly
Product Introduction
The Bently Nevada 21000 Proximity Probe Housing Assembly provides a robust and certified solution for externally mounted proximity probes. This particular model, 21000-28-05-00-052-03-02, is specifically configured with a 3300 XL 8 mm probe and a 0.5-meter cable. Additionally, it is designed to meet the stringent requirements of the American Petroleum Institute (API) 670 Standard for machinery protection.
Furthermore, this housing assembly is rated for use in hazardous locations. It features a durable aluminum body with a 304 stainless steel sleeve, offering excellent corrosion resistance. Meanwhile, the assembly is fully certified by the Canadian Standards Association (CSA) as a Type 4 enclosure, making it suitable for both explosion-proof and intrinsically safe applications. Consequently, it is an ideal choice for critical turbomachinery monitoring in the oil, gas, and power generation industries.
Technical Specifications
This section details the core technical attributes of the Bently Nevada 21000 housing. The specific suffix codes define the exact configuration of the 21000-28-05-00-052-03-02 unit.
Probe Option: 3300 XL 8 mm probe with selectable hazardous area approvals (Suffix 28).
Probe Cable Length: 0.5 m (20 inches) (Suffix 05).
Standoff Adapter: None (Suffix 00).
Probe Penetration: 5.2 inches (Suffix 052).
Mounting Thread Option: 3/4-14 NPT (Suffix 02).
Fitting Option (Suffix 03): Includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with grommets for cable sizes 1/8 to 3/8 inches.
Maximum (C) + (D) Dimension: 13.5 in (34.3 mm) with a 0.5 m cable.
Compliance: RoHS Directive 2011/65/EU.
Mechanical and Environmental Parameters
The Proximity Probe Housing Assemblies from Bently Nevada are engineered for extreme conditions. The housing is constructed from a lightweight aluminum body that incorporates a 304 stainless steel sleeve for added strength. Therefore, this combination ensures high reliability and a long service life.
The assembly is rated as a CSA Type 4 enclosure. This means it is suitable for indoor or outdoor use and provides a degree of protection against falling dirt, rain, sleet, snow, and windblown dust. Specifically, the temperature ratings are T5 @ Ta = -50°C to +40°C and T4 @ Ta = -50°C to +80°C for the North American certified version (CA21000). Besides the robust construction, the housing also includes O-rings and a thread seal to maintain its environmental integrity.
Installation Guide
Proper installation of the Bently Nevada 21000 assembly is crucial for accurate vibration and position measurements. First, ensure the mounting surface is clean, flat, and free of burrs. Verify the mounting thread is 3/4-14 NPT. Next, insert the 3300 XL 8 mm probe into the housing sleeve. For best results, the probe's part number and serial number should be visible when installed correctly.
Then, set the probe penetration to the specified 5.2 inches. This is critical for achieving the correct linear range and gap voltage. After that, use the provided thread seal to prevent leakage through the mounting thread. Moreover, route the 0.5 m probe cable through the appropriate conduit fitting. Select the correct grommet from the supplied set (for 1/8-3/16, 1/4-5/16, or 5/16-3/8 inch cables) to ensure a weather-tight seal. Finally, secure the dome cover and all conduit fittings tightly to maintain the enclosure's integrity.
Packaging List
The 21000-28-05-00-052-03-02 unit is shipped new and original in factory packaging. The package contains the following components:
1 x Bently Nevada 21000 Housing Assembly (Aluminum body with 304 stainless steel sleeve).
1 x 3300 XL 8 mm reverse mount proximity probe.
1 x 0.5 m probe cable.
1 x Dome cover.
1 x Thread seal.
1 x 3/4-14 NPT plug.
1 x 3/4-14 to 1/2-14 NPT reducer.
1 x Cable seal grip with three grommets (for 1/8-3/16, 1/4-5/16, and 5/16-3/8 inch cables).
2 x O-rings.
Frequently Asked Questions (FAQ)
1. What is the difference between the 21000 and 24701 housings?
The primary difference is the material. The Bently Nevada 21000 features an aluminum body, while the 24701 is constructed from stainless steel. However, both models are certified for hazardous areas and share the same core functionality.
2. Is the 3300 XL 8 mm probe included with this housing?
Yes, this specific model, 21000-28-05-00-052-03-02, includes the 3300 XL 8 mm probe with a connector, as indicated by the "28" suffix code in the model number.
3. What shipping methods are available for this item?
We ship this product using major international couriers. The shipping method for the Proximity Probe Housing Assemblies is typically Fedex, UPS, or DHL to ensure fast and secure delivery.
4. Can this housing be used in an intrinsically safe circuit?
Yes, the 21000 housing is certified for use in intrinsically safe applications. For instance, the circuit is non-incendive when connected per drawing 140979, making it suitable for Class I, II, and III hazardous locations.
5. What is the significance of the 5.2 inches probe penetration?
The 5.2 inches penetration (Suffix 052) defines the distance the probe extends from the mounting surface. Meanwhile, this setting is specifically chosen to position the 3300 XL probe at its optimal linear range for measuring shaft vibration and position.
