Bently Nevada 24701-28-10-00-090-00-01 Probe Housing

24701 Proximity Probe Housing – Bently Nevada 24701-28-10-00-090-00-01

Product Introduction

The Bently Nevada 24701-28-10-00-090-00-01 is a complete proximity probe housing assembly engineered to house and protect a 3300 XL 8 mm reverse‑mount probe in demanding industrial environments. Specifically, this assembly integrates a dome cover, threaded conduit ports, an optional‑length probe sleeve, O‑rings, and a thread seal into a single, ready‑to‑install unit. Therefore, it significantly simplifies field installation while ensuring robust mechanical protection for the sensing element.

Moreover, this model features a 1.0‑meter (39‑inch) probe cable, a 9‑inch probe penetration, and no standoff adapter. Meanwhile, the 01 mounting thread option indicates an as‑cast threadless design, which suits applications where the housing mounts using alternative methods such as welding or custom brackets. Additionally, the 00 fittings option means no conduit fittings are supplied, allowing users to select their preferred fittings based on site requirements.

The housing body is machined from 303 stainless steel, while the sleeve uses 304 stainless steel. Consequently, this material combination delivers excellent corrosion resistance, mechanical strength, and long‑term durability in harsh industrial environments. For instance, users frequently choose this 24701 housing assembly for steam turbines, gas compressors, pumps, and other rotating equipment where reliable probe positioning and environmental sealing are critical.

Assembly Components and Configuration

The 24701-28-10-00-090-00-01 housing assembly includes several key components that work together to provide a complete mounting solution. First, the dome cover screws securely into the housing body, protecting the internal probe and electronics from environmental contaminants. Additionally, threaded ports allow conduit connections for cable routing and sealing. The probe sleeve, available in optional lengths, determines the overall penetration depth.

Furthermore, the assembly incorporates O‑rings that create positive seals at all mating interfaces, preventing moisture, dust, and process fluids from entering the housing. A thread seal further enhances the sealing integrity between the probe and the housing body. The reverse‑mount 3300 XL 8 mm probe is pre‑installed within the assembly, ensuring correct alignment and gap setting from the factory.

This model includes the 28 probe option, which specifies a 3300 XL 8 mm probe with approval option, making it suitable for installations requiring specific agency certifications. The 10 cable length option provides a 1.0‑meter cable, offering sufficient reach for connecting to extension cables or Proximitor Sensors in typical machine layouts. Meanwhile, the 090 penetration option sets the probe extension to 9 inches, which works well for applications with moderate casing thicknesses.

Physical Dimensions and Weight

The 24701-28-10-00-090-00-01 exhibits carefully controlled dimensions to ensure proper fit within machine ports. Specifically, the maximum (C) + (D) dimension with visible probe (including P/N and S/N marking) measures 17.0 inches (43.18 mm). Meanwhile, the maximum overall (C) + (D) dimension extends to 29.2 inches (74.2 mm). These dimensions allow engineers to verify clearance before installation, preventing interference with internal machine components.

The assembly weighs 1.8 kg (4.1 lb) typical without fittings, which represents a moderate weight that balances robust construction with manageable handling during installation. This weight also contributes to the housing’s stability, reducing vibration‑induced movement that could affect measurement accuracy.

Material Specifications and Durability

Housing Body – The main body is manufactured from 303 stainless steel, which offers excellent machinability and good corrosion resistance. This material choice ensures that the housing withstands exposure to moisture, process chemicals, and atmospheric corrosion commonly found in industrial settings.

Probe Sleeve – The sleeve uses 304 stainless steel, a widely recognized grade known for its superior corrosion resistance and mechanical strength. Specifically, 304 stainless steel performs well in both high‑temperature and chemically aggressive environments, making it ideal for probe housing applications.

Sealing Components – The O‑rings and thread seal work together to maintain a tight barrier against contaminants. Although the specific O‑ring material is not detailed in this documentation, Bently Nevada typically uses high‑performance elastomers suitable for the full operating temperature range of the assembly.

Installation Guidelines

Proper installation of the 24701-28-10-00-090-00-01 ensures reliable probe performance and extends service life. First, inspect the mounting surface and machine port to confirm they are clean, smooth, and free from burrs or debris. Next, position the housing assembly into the machine port. Since this model has as‑cast threads (option 01), you may need to use alternative mounting methods such as welding, clamping, or custom brackets. Therefore, consult your mechanical engineer to determine the most secure attachment approach for your specific machine design.

Then, adjust the probe penetration to the 9‑inch setting (option 090) by sliding the sleeve to the correct position. After positioning, tighten the retaining hardware to secure the assembly in place. For the reverse‑mount probe, ensure that the probe tip faces the target surface correctly and that the gap falls within the recommended linear range. Finally, route the 1.0‑meter probe cable through the conduit ports, applying appropriate strain relief and sealing to maintain environmental protection.

Since the assembly includes pre‑installed O‑rings and a thread seal, verify that these seals remain undamaged during installation. Additionally, confirm that the dome cover is fully tightened to create a positive seal. For hazardous area installations, follow all applicable local regulations and ensure that the housing grounding path is established according to your site’s standards.

Packaging List

• 1 x 24701-28-10-00-090-00-01 24701 Proximity Probe Housing Assembly (complete assembly)

• 1 x Dome cover (pre‑installed)

• 1 x 1.0‑m probe cable with connector (pre‑installed)

• 1 x 3300 XL 8 mm reverse‑mount probe (pre‑installed)

• 1 x Thread seal (pre‑installed)

• 1 x Installation instruction manual

Shipping method: FedEx, UPS, or DHL (depending on destination and urgency).

Frequently Asked Questions (FAQ)

1. Which probes are compatible with this 24701 housing?
This housing is specifically designed for 3300 XL 8 mm probes, as indicated by the 28 probe option code. Therefore, it will not accommodate other probe diameters without appropriate adapters or modifications.

2. What does the "as cast without threads" mounting option mean?
The 01 mounting thread option means the housing has no pre‑cut threads. Consequently, you must use alternative mounting methods such as welding, clamping, or custom brackets. This design suits applications where standard NPT threads are not compatible with the machine port.

3. What is the purpose of the reverse‑mount probe configuration?
Reverse‑mount probes allow installation from the inside of the machine casing outward. Specifically, this configuration is useful when external access is limited or when the target surface is better approached from the reverse direction.

4. How do I maintain the sealing integrity over time?
Regularly inspect the O‑rings and thread seal for signs of wear, cracking, or compression set. Furthermore, replace any damaged seals immediately using genuine Bently Nevada replacement parts. Additionally, ensure the dome cover remains fully tightened to maintain the environmental seal.

5. What is the maximum operating temperature for this housing?
While the specific temperature rating for this model is not listed in the provided documentation, 303 and 304 stainless steel generally perform well up to 300°C and above. However, the O‑ring material and internal probe components typically limit the maximum continuous operating temperature. For exact ratings, consult the full product datasheet or contact Bently Nevada technical support.