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- 43501-01-04-02
- Low Pressure Cable Seal
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- 1/2-14 NPT
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Product Overview
The Bently Nevada 43501-01-04-02 is a low-pressure cable seal used to route instrumentation cables through a machine casing or other barrier while limiting fluid leakage along the outside of the cable jacket. It is part of the accessory hardware used in proximity transducer installations, particularly where shaft-monitoring cables need to pass from a machine interior to an external junction box or conduit system.
In a centrifugal compressor or steam turbine, proximity probes are often installed close to bearings to measure shaft movement. Their cables must pass through the machine casing without compromising the enclosure’s sealing arrangement. The 43501-01-04-02 addresses this mechanical requirement by combining a threaded body with a molded sealing grommet, allowing compatible cables to pass through a designated opening.
The model number identifies three key configuration options. The first option, 01, specifies a 1/2-14 NPT thread on the high-pressure side. The middle option, 04, identifies a grommet and washer arrangement that accommodates up to four cables, with one hole punched and three partially pre-drilled. The final option, 02, specifies a 3/4-14 NPT thread on the low-pressure side.
This configuration is intended for non-armored cables. When selecting a replacement, engineers should check the thread sizes on both sides, the number and type of cables passing through the seal, and the pressure difference across the installation. The cable seal is a mechanical sealing accessory rather than an electrical measurement device.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Product Series | 3300 XL Transducer Accessories |
| Model | 43501-01-04-02 |
| Product Type | Low Pressure Cable Seal |
| High Pressure Side Thread Size | 1/2-14 NPT |
| Cable Grommet and Washer | Accommodates up to 4 cables; one hole punched and three partially pre-drilled |
| Low Pressure Side Thread Size | 3/4-14 NPT |
| Body Material | 303 Stainless Steel |
| Sealing Element | Molded Silicone Rubber Grommet |
| Maximum Rated Differential Pressure | 345 kPa (50 psi), when properly installed |
| Cable Compatibility | Non-armored cables |
| Shipping Weight | 3 kg |
Product Features
- Dual threaded interfaces: Uses a 1/2-14 NPT high-pressure-side thread and a 3/4-14 NPT low-pressure-side thread.
- Four-cable capacity: The specified grommet arrangement accommodates up to four compatible cables.
- Molded sealing grommet: Helps restrict fluid leakage along the exterior of the cable jackets.
- Stainless-steel body: Uses 303 stainless steel for the threaded housing.
- Flexible cable arrangement: One opening is punched, while three additional openings are partially pre-drilled to support the required cable configuration.
- Defined pressure application: Supports differential pressures up to 345 kPa (50 psi) when properly installed and used within its specified limitations.
- Transducer accessory compatibility: Can be incorporated into suitable proximity monitoring installations using compatible non-armored cables.
Working Principle
The 43501-01-04-02 seals the cable entry point through a combination of threaded mechanical connections and a molded silicone rubber grommet. The threaded body secures the assembly between the machine casing or barrier and the corresponding conduit or housing connection. The grommet surrounds the cable jackets, restricting the path through which fluid could otherwise escape.
A typical installation follows this arrangement:
Machine Casing → High-Pressure-Side Connection → Cable Seal and Grommet → Low-Pressure-Side Connection → Junction Box or Conduit
During installation, the required cable openings are prepared in the grommet according to the cable arrangement. The cables pass through the seal, and the threaded interfaces are fitted to their corresponding connections. When installed correctly, the grommet seals around the outer cable jackets rather than relying on the electrical connectors to provide the enclosure seal.
For example, a compressor bearing housing may contain several proximity probe cables that need to pass through a common opening. The cable seal allows compatible non-armored cables to share a designated entry point while helping limit oil leakage along their outer jackets. This can simplify cable routing compared with using a separate entry for every cable.
The seal does not repair damaged cable jackets, seal internal cable-braid leakage, or replace a correctly specified pressure boundary. Its pressure rating applies to the seal body and the interface around the cable jackets. Cable damage, poor grommet preparation, incorrect thread engagement, or unsuitable cable types can compromise the installation.
Role in a Machinery Monitoring Architecture
The 43501-01-04-02 forms part of the mechanical cable-routing and sealing arrangement in a machinery monitoring installation. It does not process proximity signals; instead, it helps maintain the integrity of the cable passage between the machine and the external monitoring hardware.
Proximity Probe → Non-Armored Transducer Cable → 43501-01-04-02 Cable Seal → Junction Box or Conduit → Proximitor Sensor and Monitoring Equipment
| System Element | Function |
|---|---|
| Proximity Probe | Detects changes in the gap between the probe tip and the rotating shaft |
| Non-Armored Transducer Cable | Carries the probe signal through the machine installation |
| 43501-01-04-02 Cable Seal | Seals around compatible cable jackets at the barrier opening |
| Machine Casing | Separates the internal machinery environment from the external installation |
| Junction Box | Organizes cable connections where required |
| Conduit or Housing | Provides a protected route for the external cable installation |
| Proximitor Sensor | Converts the probe response into an electrical measurement output |
| Machinery Monitoring System | Processes shaft vibration or position measurements |
The cable seal supports the physical installation but does not determine the electrical compatibility of the probe, cable, Proximitor Sensor, or monitoring channel.
Industrial Applications
| Application | Typical Use |
|---|---|
| Centrifugal Compressors | Sealing proximity probe cable passages through bearing housings or machine barriers |
| Steam Turbines | Managing non-armored transducer cables routed from shaft-monitoring points |
| Industrial Pumps | Limiting fluid leakage along cable jackets at suitable machine openings |
| Power Generation Equipment | Supporting cable entry arrangements for rotating machinery monitoring |
| Refinery Machinery | Maintaining cable sealing at compatible instrumentation interfaces |
| Bearing Housing Installations | Routing multiple proximity cables through a common opening |
| Machinery Overhaul Projects | Replacing a worn cable seal while retaining a compatible cable arrangement |
| Monitoring System Retrofits | Adapting cable routing to the required thread and junction-box configuration |
The 43501-01-04-02 is suitable only when the cable type, thread configuration, and pressure conditions match the installation requirements. It is not intended for armored cables.
Installation and Maintenance
- Verify the model number: Confirm 43501-01-04-02 and check all three ordering-code sections before installation.
- Check the high-pressure-side thread: Verify that the mounting point accepts the specified 1/2-14 NPT connection.
- Check the low-pressure-side thread: Confirm compatibility with the 3/4-14 NPT connection on the opposite side.
- Confirm cable compatibility: Use compatible non-armored cables; do not assume that the grommet is suitable for armored cable jackets.
- Inspect the grommet: Check for cuts, hardening, deformation, or other damage that could prevent proper sealing.
- Prepare the cable openings: Match the punched and partially pre-drilled openings to the actual cable arrangement, avoiding unnecessary enlargement.
- Inspect cable jackets: Ensure that the sections passing through the grommet are free from cuts, abrasion, and surface defects.
- Check the threaded body: Examine the stainless-steel body for damaged threads, corrosion, or deformation before assembly.
- Verify the installation pressure: Confirm that the expected differential pressure does not exceed the specified 345 kPa (50 psi) rating under the applicable installation conditions.
- Secure the connections: Follow the approved procedure for both threaded interfaces and the associated sealing arrangement.
- Inspect for leakage: After installation, check the seal and surrounding connections under the site’s approved test conditions.
- Record maintenance findings: Document the cable arrangement, grommet condition, thread configuration, and any replacement work.
Before removing a cable seal from a machine casing, ensure the equipment is isolated and the pressure boundary is in a safe condition. Replace a damaged grommet or cable rather than attempting to compensate for defects by overtightening the threaded connections.
Compatible System Components
The 43501-01-04-02 is a cable-routing accessory for suitable transducer installations. The components below may be used within the same installation when their cable, connector, and mounting requirements are compatible.
| Component | Function |
|---|---|
| Bently Nevada 3300 XL 8 mm Proximity Probe | Measures relative shaft displacement |
| Bently Nevada 3300 XL Extension Cable | Connects a compatible proximity probe to the Proximitor Sensor |
| Bently Nevada 3300 XL Proximitor Sensor | Converts the probe response into an electrical output |
| Bently Nevada 03818016 Junction Box | Provides a junction-box arrangement for compatible monitoring cables |
| Bently Nevada 14848 Flexible Conduit | Provides a protected cable-routing path in suitable installations |
| Bently Nevada 137492-01 Probe Mounting Bracket | Supports the mounting of compatible proximity probes |
| Bently Nevada 40113-02 Connector Protector | Protects compatible transducer cable connectors |
Recommended Related Models
| Model | Product Type | Relevance |
|---|---|---|
| Bently Nevada 43501-01-04-01 | Low Pressure Cable Seal | Same high-pressure-side thread and four-cable grommet option, with a 1/2-14 NPT low-pressure-side thread |
| Bently Nevada 43501-01-02-01 | Low Pressure Cable Seal | Alternative grommet arrangement for up to two compatible 25 mm or 50 mm DE transducer cables |
| Bently Nevada 43501-01-00-01 | Low Pressure Cable Seal | Solid-grommet configuration with 1/2-14 NPT threads on both sides |
| Bently Nevada 43501-02-04-02 | Low Pressure Cable Seal | Four-cable configuration with 3/4-14 NPT threads on both sides |
| Bently Nevada 43501-02-04-01 | Low Pressure Cable Seal | Alternative high-pressure-side thread configuration for a four-cable grommet arrangement |
| Bently Nevada 10076-02 | Cable Seal | Related cable sealing accessory for compatible transducer cable installations |
Key Advantages
- Routes up to four compatible non-armored cables through a common barrier opening.
- Combines 1/2-14 NPT and 3/4-14 NPT threaded interfaces.
- Uses a molded silicone rubber grommet to restrict leakage along cable jackets.
- Supports differential pressures up to 345 kPa (50 psi) when properly installed.
- Provides a defined replacement configuration for machinery monitoring cable installations.
Technical FAQs
How does the 43501-01-04-02 differ from the 43501-01-04-01?
Both models specify a 1/2-14 NPT high-pressure-side thread and a four-cable grommet arrangement. The final ordering-code section differs: 02 specifies a 3/4-14 NPT low-pressure-side thread, while 01 specifies a 1/2-14 NPT low-pressure-side thread.
Can armored proximity probe cables be installed through this cable seal?
No. The 43501 low-pressure cable seal is specified for non-armored cables. A suitable cable-entry arrangement must be selected for installations using armored cables.
What does the four-cable grommet option mean?
The 04 option identifies a grommet that can accommodate up to four compatible cables. One hole is punched, and three additional holes are partially pre-drilled. The opening arrangement must be prepared to suit the actual cable installation.
Does the 345 kPa pressure rating apply to the entire transducer system?
No. The stated rating applies to the cable seal under proper installation conditions, specifically its body and sealing interface around the cable jackets. It does not guarantee sealing through damaged cables, connectors, probe assemblies, or other parts of the machinery installation.