General Information

Core Description

The 21000-16-10-00-054-04-02 is a Bently Nevada proximity probe housing assembly featuring a lightweight copper-free aluminum body and an integrated 3300 XL 8mm probe. Fully compliant with API 670 standards, this unit works seamlessly with standard industrial machinery monitoring platforms to deliver certified explosion-proof containment and stable radial vibration telemetry in harsh plant environments.

Specific Application

External mounting and explosion-proof containment for proximity probes tracking radial shaft vibration or axial position on rotating machinery.

Target displacement tracking inside hazardous areas where a custom sleeve penetration depth of 5.4 inches is needed without full casing disassembly.

Protection of internal reverse mount sensor elements and cabling junction connections against mechanical damage and weather elements.

Ordering Information Summary

System Compatibility and Alternative Models

• System Compatibility: Contains an integrated 3300 XL 8mm reverse-mount proximity probe with a 1.0-meter cable length. It interfaces directly with Bently Nevada 3300 XL Proximitor Sensors, 3300 XL Extension Cables, and machinery protection architectures like the 3500 rack system.
• Alternative Model: 24701-16-10-00-054-04-02 Proximity Probe Housing Assembly.
• Key Differences:

• Casing Material: The 21000 model utilizes a lightweight aluminum body with a 304 stainless steel sleeve, whereas the 24701 version relies entirely on a ruggedized 303 stainless steel main housing structure.
• Weight Metrics: The 21000 aluminum variant features a typical unmounted mass of 1.1 kg (2.4 lb), whereas the 24701 stainless steel assembly is notably heavier at 1.8 kg (4.1 lb).

Installation & Troubleshooting FAQ

Q1: What exact installation criteria do the trailing options "-00-054-04-02" identify?
A: The "-00" option states no standoff adapter is utilized. The "-054" defines a clear probe sleeve penetration depth of 5.4 inches (137 mm). The "-04" means the assembly includes one 3/4-14 NPT conduit plug only. The "-02" defines an extra-threaded 3/4-14 NPT machine casing mounting connection machined with 5 to 7 full threads to increase mounting strength.

Q2: Why must the reverse-mount probe leading cable remain strictly longer than the rigid sleeve body?
A: The probe cable lead length must remain strictly longer than the overall length of the rigid penetration sleeve. Failing to verify this cable clearance causes the miniature coaxial cable terminal to become stuck or stressed inside the narrow sleeve pipe during reverse-mount adjustments, inducing broken conductors or intermittent ground faults.

Q3: What critical symptom occurs if the probe penetration depth leaves less than 2.0 inches of external clearance?
A: For probe penetration lengths between 1.0 and 2.0 inches, it may be necessary to counter-bore the machine case to avoid probe side view or rear view signal anomalies. The electromagnetic field will couple with surrounding metal walls, reducing sensitivity or totally distorting the sensor's linear calibration response curve

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: