Core Description
The 21000-28-05-00-077-03-02 is a Bently Nevada aluminum proximity probe housing assembly featuring an integrated 3300 XL 8mm transducer system. Completely contained within a certified explosion-proof structure, this all-metal unit works seamlessly with central machinery monitors to deliver external sensor mounting and stable industrial asset protection communication.
Specific Application
- External Sensor Protection: Mounting fragile proximity probes externally on fluid-film bearing machines while preserving full explosion-proof ratings in hazardous processing environments.
- Double-Walled Machine Penetration: Reaching across specialized outer enclosures or thick casing water-jackets through a robust 7.7-inch stainless steel probe sleeve layout.
- Multi-Cable Sealed Management: Running field wiring safely through dedicated 3/4-14 NPT ports with an explosion-proof cable seal grip and tailored internal routing grommets.
Specific Application
- External Sensor Protection: Mounting fragile proximity probes externally on fluid-film bearing machines while preserving full explosion-proof ratings in hazardous processing environments.
- Double-Walled Machine Penetration: Reaching across specialized outer enclosures or thick casing water-jackets through a robust 7.7-inch stainless steel probe sleeve layout.
- Multi-Cable Sealed Management: Running field wiring safely through dedicated 3/4-14 NPT ports with an explosion-proof cable seal grip and tailored internal routing grommets.
Ordering Information Summary
|
Option Path Identifier |
Selected Code |
Suffix Technical Meaning |
Specific Engineering Dimension / Value |
|
Base Model Number |
21000 |
Aluminum Probe Housing Assembly |
Lightweight aluminum main body configuration with 304 SST sleeve. |
|
Option A Component |
28 |
Probe with Connector Option |
3300 XL 8mm probe, selectable hazardous area approvals. |
|
Option B Component |
05 |
Probe Cable Length Option |
0.5 meter (20 inches) integrated triaxial leading cable. |
|
Option C Component |
00 |
Standoff Adapter Length Option |
No standoff adapter utilized on this layout. |
|
Option D Component |
077 |
Probe Penetration Option |
7.7 inches (196 mm) total internal case sleeve penetration. |
|
Option E Component |
03 |
Conduit Fittings Option |
One cable seal grip with grommets (for standard field cables). |
|
Option F Component |
02 |
Housing Mounting Thread Option |
3/4-14 NPT structural connection thread (has 5 - 7 full threads). |
Installation & Troubleshooting FAQ
Q1: What specific torque guidelines and environmental restrictions govern the assembly?
A: When anchoring the standoff adapter or the 3/4-14 NPT threaded casing lines, field engineers must preserve thread engagement to maximize structural stiffness. The internal probe tip handles temperatures from -51°C to +177°C (-60°F to +351°F). However, the module must not drop below -34°C (-30°F) operationally, or the internal pressure seals will experience premature structural failure.
Q2: Why is my external probe recording signal noise or physical resonance inside the sleeve track?
A: Physical resonance or vibration occurs when long sleeve paths are left completely unsupported in the field. Because this option utilizes a 7.7-inch combined penetration length, it stays below the strict 12-inch (304 mm) mandatory support line. However, if surrounding machine vibration is severe, you must install an internal probe support and oil seal assembly (part number 37948-01) to eliminate mechanical signal deviations.
Q3: How do I manage the probe scale factor if my counterbore clearance is tight?
A: For total probe penetration lengths between 1.0 and 2.0 inches, the surrounding steel case can create side-view or rear-view dampening faults. Ensure your field casing counterbore diameter is machined to a minimum of 24mm (three times the 8mm probe tip diameter) to completely prevent the electromagnetic field from shorting against the metallic walls.
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