Description
Bently Nevada 43501‑02‑04‑02 — Low‑Pressure Cable Seal Assembly
Product Overview
The 43501‑02‑04‑02 is a complete OEM low‑pressure cable‑seal assembly for Bently Nevada 3300‑XL proximity transducer systems. It provides pressure‑tight, oil‑mist‑proof cable penetration when multiple proximity‑probe coaxial cables pass through turbine / compressor machine‑case walls. This integrated metal fitting includes metal housing, multi‑hole silicone grommet (43574‑04) and matching washer (43575‑04). It isolates internal lube‑oil mist from external instrument wiring, prevents oil leakage out of machine casing, and delivers strain‑relief for transducer cables. It is widely used on API‑670 turbomachinery protection installations in power, petrochemical and refinery sites.
Critical Compatibility Warning
- Designed for 3300‑XL proximity probe coaxial cables (Microdot / ClickLoc type), supports up to four transducer cables in one assembly.
- Working condition: low‑pressure service only, not suitable for high‑pressure casing applications. Select high‑pressure seal variant for high‑pressure machinery casing.
- Thread specification: 3/4‑14 NPT for both machine‑case side and external side. Must mate with matching 3/4‑14 NPT tapped casing port.
- This is a full mechanical assembly; it does not modify transducer electrical signal performance. Grommet spare part 43574‑04 can be replaced separately during overhaul.
Part Number Decoding
- 43501：Low‑pressure cable‑seal main assembly series
- ‑02：Thread specification, 3/4‑14 NPT on high‑pressure (machine casing) side
- ‑04：Internal grommet configuration, accommodates maximum 4 transducer cables (1 pre‑punched hole, 3 partially pre‑drilled holes)
- ‑02：Thread specification, 3/4‑14 NPT on low‑pressure external side
43501-02-04-02
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | 43501‑02‑04‑02 |
| Series | 3300‑XL Transducer System Accessory |
| Product Type | Complete Low‑Pressure Cable‑Seal Assembly |
| Thread Size | 3/4‑14 NPT (both casing side & external side) |
| Cable Capacity | Up to 4 pcs 3300‑XL proximity probe coaxial cables |
| Internal Grommet | 43574‑04 silicone multi‑hole slit grommet |
| Matching Washer | 43575‑04 |
| Housing Material | Stainless‑steel machined body |
| Grommet Material | Oil‑resistant silicone rubber |
| Max Working Pressure | Low‑pressure service only |
| Operating Temperature Range | ‑40 °C ~ +125 °C |
| Function | Oil‑mist sealing, cable strain relief, casing penetration feed‑through |
| Certifications | Mechanical fitting; no intrinsic‑safety electrical certification |
| Country of Origin | USA |
| Weight | ≈0.25 kg |
Main Features
- Complete integrated cable‑seal assembly: Stainless‑steel body pre‑assembled with 4‑hole grommet and washer, ready for field installation.
- Four‑cable feed‑through design: Enables up to four proximity‑transducer cables to exit through one casing port, reduces casing drilling quantity.
- Dual‑end 3/4‑14 NPT thread: Standard industry thread for turbomachinery casing tapping ports, convenient mechanical mounting.
- Oil‑mist tight sealing performance: Blocks lube‑oil mist leakage from machine casing, protects external transducer cables and instrument cabinets from oil contamination.
- Built‑in cable strain‑relief function: Reduces mechanical pulling stress transferred to probe connectors.
- Replaceable consumable grommet: Grommet 43574‑04 can be individually swapped during overhaul without replacing entire metal housing.
- Robust stainless‑steel construction: Resists oil mist, vibration and long‑term industrial environmental corrosion.
- Compliant with API‑670 field installation requirements for proximity transducer feed‑through fittings.
Typical Application Scenarios
- Casing penetration feed‑through for multiple 3300‑XL proximity probe cables on steam turbines, gas turbines and centrifugal compressors
- Prevent lube‑oil‑mist leakage along transducer cable jackets in refinery, petrochemical and power‑plant critical rotating‑machinery systems
- New‑project installation for multi‑probe measurement points (radial vibration, thrust position, Keyphasor) sharing one casing opening
- Overhaul spare‑part replacement for original Bently Nevada low‑pressure cable‑seal assemblies
- Retrofit modification for existing turbomachinery monitoring systems where multiple transducer cables need single‑point casing exit
Related & Recommended Alternative Models
| Model | Description |
|---|---|
| 43501‑02‑02‑02 | Low‑pressure cable seal, 2‑cable grommet, 3/4‑14 NPT both ends |
| 435xx High‑pressure cable‑seal series | For high‑pressure machine‑case application (not this low‑pressure type) |
| 43574‑04 | Spare 4‑hole silicone grommet (replacement consumable part) |
| 43575‑04 | Matching replacement washer for grommet assembly |
Compatible Components & Accessories
- Transducer cables: 3300‑XL probe pigtails, 330130 series extension cables (Microdot / ClickLoc)
- Internal spare parts: 43574‑04 grommet, 43575‑04 washer
- Mechanical consumables: High‑temperature thread sealant for NPT thread joints
- Installation tool: Torque wrench for NPT fitting tightening; grommet installation auxiliary tool
- Proximity transducers: 21508‑xx‑xx‑xx‑02, 330905‑xx‑xx‑xx‑02‑xx and other 3300‑XL probes
Installation and Configuration Guide
Warning: Installation shall be performed by qualified mechanical‑instrument technicians. Lock‑out rotating‑machinery before opening casing penetration ports. Always refer to original Bently Nevada transducer‑accessory installation manual. This is purely mechanical fitting, no live‑circuit operation required.
- Pre‑installation Inspection & Preparation
- Confirm machine‑case tapping port is 3/4‑14 NPT and belongs to low‑pressure zone. Do not install on high‑pressure casing ports.
- Check all transducer cable outer jackets, reject cables with cuts, cracks or oil‑swollen insulation.
- Verify internal grommet and washer inside 43501‑02‑04‑02 assembly are intact without crack or deformation.
- Cable‑through Grommet Routing
- Open slit of internal 4‑hole grommet, insert each transducer cable into grommet holes; maximum four cables. Pre‑drilled spare holes can be punctured on‑site when extra cables are needed.
- Ensure cables sit snug inside grommet holes without excessive gaps. Avoid cable jacket twisting.
- Thread Mounting onto Machine Casing
- Apply high‑temperature‑resistant thread sealant to external NPT threads of seal assembly.
- Screw whole cable‑seal assembly into casing tapped port, tighten to manufacturer‑specified torque value. Do not over‑torque, over‑tightening will crush silicone grommet and destroy sealing performance.
- Post‑installation Verification
- Confirm grommet is not pinched, extruded or twisted inside metal housing.
- Pull each cable gently to check strain‑relief effect; cables shall not slide freely through seal assembly.
- Check for gaps between cables and grommet holes which would cause oil‑mist bypass leakage.
- Maintenance & Troubleshooting
- During machinery turnaround, disassemble seal assembly and inspect grommet for hardening, oil‑swelling, cracking. Replace grommet 43574‑04 once degradation appears.
- Oil‑mist leakage at penetration point usually indicates aged grommet, insufficient tightening torque, damaged cable jacket or wrong‑pressure‑grade seal selection.
- Grommet can be replaced separately; stainless‑steel metal housing can be reused if no mechanical damage.
Supplementary Remark
43501‑02‑04‑02 is a complete low‑pressure stainless‑steel cable‑seal assembly for 3300‑XL proximity transducer systems, with dual‑end 3/4‑14 NPT thread and 4‑cable capacity internal grommet. It provides oil‑mist‑proof sealing and cable strain‑relief for multi‑probe cables exiting low‑pressure turbomachinery casing. This assembly is only for low‑pressure service; do not deploy for high‑pressure casing ports. Before commissioning, cross‑check thread dimension, pressure‑grade rating, cable quantity requirement and spare‑grommet compatibility versus project BOM and mechanical drawings.
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