LPMBH-3-MP-IM Impulse Low Profile Micro Bulkhead 3-Pin Male Underwater Connector

Product Overview

The HYSF SUBSEA LPMBH-3-MP-IM Impulse Low Profile Micro Bulkhead 3-Pin Male Underwater Connector is a compact, high-pressure wet-pluggable electrical bulkhead connector designed for demanding subsea, oceanographic, and underwater instrumentation applications.Featuring three male pin contacts and a compact low-profile body, the LPMBH-3-MP-IM provides a reliable electrical feedthrough solution for underwater pressure housings, ROV systems, AUV platforms, underwater gliders, subsea sensors, and marine monitoring equipment.As part of the Impulse-compatible Low Profile Micro Wet-Pluggable Connector Series, the LPMBH-3-MP-IM is designed for applications where compact dimensions, reliable electrical connections, and high hydrostatic pressure resistance are essential.Unlike conventional cylindrical underwater bulkhead connectors, the Low Profile Micro series features a streamlined, flat-profile construction. This design helps reduce external projection and hydrodynamic resistance, making it particularly suitable for autonomous underwater vehicles (AUVs), underwater gliders, compact sensor housings, and space-restricted subsea equipment.The LPMBH-3-MP-IM features three male electrical pin contacts in a bulkhead mounting configuration. It is designed to be installed through an equipment panel or pressure housing, providing an electrical interface between internal wiring and external underwater cable assemblies.Its molded Neoprene (Chloroprene Rubber) body, metallic bulkhead hardware, and gold-plated electrical contacts provide a reliable connection solution for demanding marine environments.The connector has a reference voltage rating of 250 V AC/DC RMS and a current rating of 5 A per contact. Its three-contact configuration provides a compact electrical interface for compatible power supply, signal transmission, and auxiliary control circuits.For demanding subsea applications, the connector features a reference mated pressure rating of up to 10,000 psi (approximately 690 bar), equivalent to approximately 7,000 meters of seawater depth.The bulkhead configuration also incorporates an O-ring sealing arrangement to maintain watertight integrity at the equipment mounting interface. The reference O-ring size is 2-014.The LPMBH-3-MP-IM belongs to the wet-pluggable connector family and is designed for underwater mating with a compatible three-socket female in-line connector. The available product specification lists more than 500 wet-mating cycles.The connector features a 7/16-20 UNF mounting thread, a standard 1/2-inch thread length, and 12-inch Teflon-insulated internal leads according to the original Impulse LPMBH engineering documentation.Its male contact configuration, low-profile design, compact bulkhead mounting structure, and high-pressure performance make it suitable for AUV sensor housings, ROV equipment panels, underwater cameras, oceanographic instruments, hydrophone systems, and deep-sea monitoring equipment.HYSF SUBSEA provides underwater bulkhead connectors, low-profile subsea connectors, wet-pluggable electrical connectors, underwater panel feedthroughs, and customized subsea cable assemblies for marine equipment manufacturers, oceanographic research institutions, ROV manufacturers, AUV developers, and offshore engineering contractors.

Key Features and Benefits

1. Three-Pin Male Bulkhead Configuration

The LPMBH-3-MP-IM features three male electrical pin contacts in a compact bulkhead mounting configuration.The three-contact arrangement provides an electrical feedthrough interface for compatible underwater power and signal applications.Key characteristics include:

• Three male pin contacts
• Three-contact electrical configuration
• Male bulkhead connector design
• Panel-mounted installation
• Compact electrical feedthrough interface
• Suitable for power and signal circuits
• Designed for underwater pressure housings
• Compatible with corresponding three-socket female connectors

Typical electrical applications include:

• Underwater power supply
• Subsea signal transmission
• Sensor electrical connections
• Marine instrumentation
• Underwater monitoring systems
• AUV electrical connections
• ROV sensor connections
• Subsea camera systems
• Oceanographic instruments
• Underwater data acquisition equipment
• Auxiliary control circuits

The three-pin configuration allows compatible electrical circuits to pass through an underwater equipment housing using a single compact connector.

2. Low-Profile and Streamlined Body Design

The LPMBH-3-MP-IM features a low-profile body designed for applications where connector dimensions, external projection, and hydrodynamic resistance are important considerations.Unlike conventional cylindrical underwater connectors, the Low Profile Micro series uses a flatter and more streamlined body configuration.This design provides several advantages:

• Reduced external connector projection
• Compact installation footprint
• Streamlined underwater profile
• Reduced potential for snagging
• Improved integration with compact instrument packages
• Suitable for AUV hull-mounted equipment
• Suitable for underwater glider fairings
• Suitable for compact ROV sensor frames
• Improved integration in space-restricted equipment

For autonomous underwater vehicles and underwater gliders, external connector geometry can influence hydrodynamic resistance and equipment integration.The LPMBH-3-MP-IM provides a low-profile electrical feedthrough solution for equipment designers who need to minimize protruding components on underwater platforms.

3. Bulkhead Mounting and Electrical Feedthrough Design

The LPMBH-3-MP-IM is designed as a male bulkhead connector for installation through an underwater equipment panel or pressure housing.Unlike an in-line cable connector, the bulkhead configuration provides a fixed electrical interface between the external underwater connector and the internal electrical wiring of the equipment.Key benefits include:

• Panel-mounted electrical feedthrough
• Compact pressure-housing integration
• Male pin contact configuration
• O-ring sealing interface
• Internal Teflon-insulated electrical leads
• Suitable for underwater equipment enclosures
• Convenient external cable connection
• Suitable for subsea electronics integration

The connector can be integrated into compatible ROV housings, AUV pressure vessels, underwater camera enclosures, sensor packages, and oceanographic instrument housings.Its bulkhead configuration helps simplify the connection between internal electronic systems and external underwater equipment.

4. Molded Neoprene / Chloroprene Rubber Body

The LPMBH-3-MP-IM features a molded Neoprene (Chloroprene Rubber) connector body.Neoprene rubber is widely used in underwater connector systems because of its flexibility and suitability for marine environments.Key characteristics include:

• Molded rubber body
• Neoprene / Chloroprene Rubber construction
• Flexible protective structure
• Electrical insulation around the connector interface
• Suitable for underwater applications
• Designed for subsea equipment integration
• Supports compact connector construction

The molded rubber structure helps protect the electrical interface and provides flexibility for demanding underwater applications.

5. Corrosion-Resistant Bulkhead Hardware

The LPMBH-3-MP-IM uses metallic bulkhead mounting hardware designed for marine and subsea environments.The original Impulse LPMBH documentation identifies brass bulkhead hardware. Stainless steel configurations are also listed in compatible product specifications, with titanium available as an optional material for weight-sensitive applications.Available material references include:

• Brass Bulkhead Hardware
• 316 Stainless Steel Option
• Optional Titanium Hardware
• Neoprene Rubber Body
• Corrosion-resistant electrical contact surfaces

Material selection can be specified according to equipment design, seawater exposure, corrosion requirements, and project conditions.

6. Gold-Plated Electrical Contacts

The LPMBH-3-MP-IM features three gold-plated male electrical pin contacts.Gold-plated contact surfaces help provide reliable electrical conductivity and corrosion resistance in demanding marine environments.Key benefits include:

• Three gold-plated male contacts
• Reliable electrical mating interface
• Improved corrosion resistance
• Stable electrical contact performance
• Low contact resistance
• Suitable for repeated mating operations
• Designed for subsea electrical connections
• Reliable power and signal transmission

The male pin configuration is designed to mate with the corresponding three-socket female connector.The gold-plated contact arrangement helps maintain electrical continuity in compatible underwater power and signal systems.

7. 250 V AC/DC RMS Voltage Rating

The LPMBH-3-MP-IM has a reference voltage rating of 250 V AC/DC RMS according to the specific product specification.This electrical rating makes the connector suitable for a variety of underwater instrumentation, monitoring, and electrical applications within its specified limits.Typical applications include:

• Underwater sensor power supply
• Marine monitoring equipment
• AUV auxiliary electrical circuits
• ROV instrumentation
• Subsea camera connections
• Underwater measurement equipment
• Oceanographic sensor systems
• Underwater communication equipment
• Subsea control circuits

The voltage rating should be evaluated together with cable insulation, connector mating conditions, operating environment, and complete electrical system design.

8. 5 A Per Contact Current Rating

The LPMBH-3-MP-IM has a reference current rating of 5 A per contact.With three electrical contacts, the reference maximum total connector current is 15 A, subject to electrical loading and thermal derating requirements.Electrical specifications:

• Number of Contacts: 3
• Contact Gender: Male Pin
• Current Rating: 5 A per Contact
• Reference Maximum Total Current: 15 A
• Voltage Rating: 250 V AC/DC RMS

This configuration is suitable for compatible sensor power, control signals, and auxiliary electrical circuits.Actual allowable current depends on simultaneous contact loading, conductor size, cable length, temperature, and the complete electrical installation.For applications requiring higher current, a suitable higher-current subsea bulkhead connector should be evaluated.

9. High Hydrostatic Pressure Resistance

The LPMBH-3-MP-IM is designed for demanding subsea applications requiring reliable electrical connections under high hydrostatic pressure.The reference mated pressure rating is:

• Mated Pressure: 10,000 psi
• Equivalent Pressure: Approximately 690 bar
• Reference Operating Depth: Approximately 7,000 m

The official Impulse documentation identifies a 10,000 psi mated pressure rating for the LPMBH connector family.For bulkhead connectors, the original manufacturer documentation specifies an open-face pressure rating of up to 5,000 psi.These pressure specifications make the LPMBH-3-MP-IM suitable for demanding underwater applications involving deepwater ROV equipment, AUV payloads, oceanographic instruments, subsea sensor packages, and underwater monitoring systems.The mated pressure rating applies to the correctly configured and mated connector assembly.Open-face pressure capability is a separate rating and should be considered independently.The complete installed equipment assembly, including the pressure housing and mounting interface, must also be qualified for its intended operating depth.

10. Wet-Pluggable Connection Capability

The LPMBH-3-MP-IM belongs to the Impulse-compatible Low Profile Wet-Pluggable Connector Series.Wet-pluggable underwater connectors are designed to support mating and unmating operations in an underwater environment when used according to the manufacturer’s procedures.This capability is particularly useful for subsea equipment requiring regular replacement, maintenance, or connection of external instruments.Typical benefits include:

• Underwater mating capability
• Reduced need to recover complete equipment assemblies
• Easier subsea equipment replacement
• Convenient sensor installation
• Flexible underwater instrument integration
• Suitable for marine research systems
• Designed for repeated connection operations
• Suitable for subsea equipment maintenance

The specific product listing references more than 500 wet-mating cycles.Actual service life depends on operating conditions, maintenance, contact cleanliness, seal condition, and correct mating procedures.

11. O-Ring Sealing System

The LPMBH-3-MP-IM incorporates an O-ring sealing arrangement at the bulkhead mounting interface.The original Impulse engineering drawing identifies a 2-014 O-ring.The O-ring helps provide a watertight seal between the connector body and the equipment mounting surface.Key characteristics include:

• O-ring sealing arrangement
• Reference O-ring size: 2-014
• Nitrile rubber sealing option
• Designed for pressure-housing installation
• Protection against water ingress
• Suitable for subsea bulkhead applications
• Requires proper surface preparation and installation

The mounting surface should be clean, flat, and free from scratches or damage around the sealing area.O-rings should be inspected for cuts, deformation, wear, and contamination before installation.

12. 7/16-20 UNF Bulkhead Mounting Thread

The LPMBH-3-MP-IM uses a 7/16-20 UNF mounting thread according to the original Impulse LPMBH engineering drawing.Reference mechanical specifications include:

• Mounting Thread: 7/16-20 UNF-2A
• Standard Thread Length: 1/2 inch
• Reference O-Ring: 2-014
• Internal Leads: 12-inch Teflon-insulated leads
• Mounting Configuration: Bulkhead / Panel Mount

This threaded mounting arrangement allows the connector to be installed through a compatible equipment panel or pressure housing.The mounting dimensions and sealing interface should be checked against the equipment drawing before machining the installation hole.

13. Internal Teflon-Insulated Electrical Leads

The LPMBH-3-MP-IM is designed with internal electrical leads for connection to the equipment’s internal wiring system.The original Impulse LPMBH engineering documentation identifies 12-inch Teflon-insulated leads.Key characteristics include:

• Internal electrical pigtails
• Teflon / PTFE insulation
• Three electrical conductors
• Suitable for internal equipment wiring
• Designed for pressure-housing integration
• Supports convenient electrical termination

The internal leads can be connected to compatible circuit boards, power distribution systems, sensor electronics, and subsea control equipment.The conductor gauge and termination requirements should be checked against the selected product configuration and electrical load.

14. Compatible Female In-Line Connector

The LPMBH-3-MP-IM is designed to mate with a compatible three-contact female socket connector.A reference mating configuration is:

• Male Bulkhead Connector: LPMBH-3-MP-IM
• Female In-Line Connector: LPIL-3-FS-IM

The female in-line connector provides the external cable connection to the male bulkhead connector installed on the equipment housing.This combination provides a practical cable-to-equipment connection solution for underwater instruments and subsea electronic systems.The exact mating dimensions, contact arrangement, and locking sleeve configuration should be verified against the approved engineering drawing before ordering.

15. Locking Sleeve for Secure Connection

The LPMBH-3-MP-IM uses a compatible locking arrangement to secure the mating connector assembly.POM and stainless steel locking sleeve options are identified in the available product specification.A locking sleeve helps prevent accidental connector separation caused by vibration, cable movement, or dynamic underwater operating conditions.Key benefits include:

• Secure mating connection
• Improved mechanical retention
• Reduced risk of accidental disconnection
• Suitable for ROV cable assemblies
• Suitable for AUV instrumentation
• Improved connection stability during deployment
• Additional mechanical protection

The compatible locking sleeve should be correctly installed according to the connector installation requirements.

16. Electrical Insulation and Contact Resistance Performance

The available specific product specifications provide the following reference electrical performance values:

• Insulation Resistance: Greater than 200 MΩ
• Contact Resistance: Less than 0.01 Ω

These characteristics support reliable electrical performance in compatible underwater instrumentation systems.Insulation resistance is important for maintaining electrical separation between contacts and preventing unwanted leakage paths.Low contact resistance helps reduce electrical losses at the mating interface.Actual electrical performance should be evaluated according to the applicable test method, measurement voltage, connector condition, and complete electrical assembly.

17. Suitable for AUV and Underwater Glider Applications

Autonomous underwater vehicles and underwater gliders require compact electrical feedthroughs that do not unnecessarily increase external dimensions or hydrodynamic resistance.The LPMBH-3-MP-IM provides a low-profile three-pin male bulkhead connection for these platforms.Typical applications include:

• AUV sensor housing connections
• Underwater glider instrumentation
• Profiling float equipment
• Oceanographic research vehicles
• Autonomous monitoring platforms
• Compact underwater measurement systems
• External sensor connections
• Subsea pressure-housing feedthroughs

Its low-profile construction is particularly useful when integrating electrical connections into compact equipment housings.

18. Suitable for ROV and Subsea Instrumentation

ROV systems use various underwater electrical connectors for power distribution, sensor connections, and monitoring equipment.The LPMBH-3-MP-IM provides a three-pin male bulkhead connection option for compatible ROV instrumentation.Typical applications include:

• ROV sensor connections
• Subsea camera systems
• Underwater lighting equipment
• ROV-mounted monitoring instruments
• Subsea control equipment
• Marine measurement systems
• Underwater inspection equipment
• ROV auxiliary electrical connections
• Subsea electronics housings

Its compact bulkhead structure is useful in crowded ROV frames and equipment housings where installation space is limited.

19. Oceanographic and Environmental Monitoring Applications

Oceanographic instruments require reliable underwater electrical feedthroughs for long-term data collection and environmental monitoring.The LPMBH-3-MP-IM can be integrated into compatible oceanographic sensor housings.Typical applications include:

• CTD instruments
• Dissolved oxygen sensors
• Fluorometer sensors
• Water-quality monitoring equipment
• Turbidity measurement systems
• Oceanographic data loggers
• Environmental monitoring platforms
• Deep-sea research instruments
• Scientific landers
• Benthic observatories
• Marine measurement equipment

The three-contact electrical interface provides a compact connection solution for compatible sensor power, signal, and auxiliary circuits.

20. Underwater Camera and Lighting Systems

Underwater cameras and lighting systems require reliable electrical feedthroughs between internal electronics and external underwater cables.The LPMBH-3-MP-IM provides a compact three-pin male bulkhead connection for compatible camera and lighting equipment.Typical applications include:

• Underwater inspection cameras
• Compact ROV cameras
• Subsea video systems
• Underwater LED lighting
• Marine imaging equipment
• Underwater monitoring cameras
• Camera control systems
• Subsea auxiliary power connections
• Marine inspection instruments

The connector should be selected according to the camera’s voltage, current, pin assignment, and mating interface requirements.

21. Deep-Sea Landers and Benthic Observatories

Deep-sea landers and benthic observatories use multiple underwater sensors and monitoring instruments for long-term scientific research.These systems require compact and reliable electrical feedthroughs for sensor power, data acquisition, and equipment control.The LPMBH-3-MP-IM can be integrated into compatible equipment housings for:

• Deep-sea landers
• Benthic observatories
• Oceanographic monitoring platforms
• Long-term environmental monitoring systems
• Subsea data acquisition equipment
• Scientific underwater instruments
• Marine research installations

Its compact low-profile configuration is useful for instrument layouts where installation space is limited.

22. OEM and Customized Subsea Bulkhead Solutions

HYSF SUBSEA provides underwater bulkhead connectors, low-profile connectors, wet-pluggable electrical connectors, and customized subsea cable assemblies for OEM equipment manufacturers.Engineering support can include:

• Three-pin male bulkhead connectors
• Low-profile bulkhead configurations
• Impulse-compatible connector interfaces
• Customized bulkhead hardware materials
• Brass and stainless steel options
• Optional titanium hardware
• Internal electrical lead configurations
• Compatible female in-line connectors
• Locking sleeve selection
• Technical drawings
• Electrical testing
• Hydrostatic pressure testing
• OEM pressure-housing integration

Customers can provide equipment drawings, panel thickness, mounting thread requirements, operating pressure, electrical specifications, and mating connector models for engineering evaluation.

LPMBH-3-MP-IM Technical Specifications

• Brand: HYSF SUBSEA
• Model: LPMBH-3-MP-IM
• Connector Series: Impulse Low Profile Micro
• Product Type: Bulkhead Underwater Connector
• Connector Configuration: 3-Pin Male
• Number of Contacts: 3
• Contact Gender: Male Pin
• Contact Size: #16 Reference
• Voltage Rating: 250 V AC/DC RMS
• Current Rating: 5 A per Contact
• Reference Maximum Total Current: 15 A
• Insulation Resistance: Greater than 200 MΩ
• Contact Resistance: Less than 0.01 Ω
• Mated Pressure Rating: 10,000 psi / Approximately 690 bar
• Reference Mated Depth: Approximately 7,000 m
• Open-Face Pressure Rating: 5,000 psi / Approximately 345 bar
• Wet-Mate Cycles: More than 500 (Product Specification Reference)
• Connector Body: Neoprene / Chloroprene Rubber
• Bulkhead Hardware: Brass / 316 Stainless Steel, Configuration-Dependent
• Optional Hardware: Titanium
• Contact Material: Beryllium Copper / Brass
• Contact Plating: Gold-Plated
• Mounting Thread: 7/16-20 UNF-2A
• Standard Thread Length: 1/2 inch
• O-Ring Reference: 2-014
• Sealing Material: Nitrile Rubber
• Internal Leads: 12-inch Teflon / PTFE Insulated Leads
• Locking Sleeve: Compatible POM or Stainless Steel
• Water Temperature: −4°C to +60°C
• Air Temperature: −40°C to +60°C
• Connector Profile: Low-Profile / Streamlined
• Installation: Bulkhead / Panel Mount
• Mating Connector: Compatible 3-Pin Female In-Line Connector
• Reference Female In-Line Connector: LPIL-3-FS-IM
• Compatible Dummy: LPMDC-3-FS Reference
• Connector Type: Wet-Pluggable
• Typical Applications: AUVs, ROVs, Underwater Gliders, Oceanographic Instruments, Subsea Sensors, Underwater Cameras, and Marine Monitoring Systems

Typical Applications of LPMBH-3-MP-IM

1. Autonomous Underwater Vehicles (AUVs)

AUVs require compact and reliable electrical feedthroughs for sensors, navigation systems, and external instrumentation.The LPMBH-3-MP-IM provides a low-profile three-pin male bulkhead connection suitable for compatible AUV pressure housings and sensor payloads.

2. Underwater Gliders

Underwater gliders require streamlined equipment configurations to maintain hydrodynamic efficiency.The LPMBH-3-MP-IM can be used for electrical connections between internal glider electronics and external underwater cables.

3. ROV Systems

ROV platforms use multiple electrical connectors for cameras, sensors, lighting, and auxiliary instruments.The LPMBH-3-MP-IM provides a compact panel-mounted electrical feedthrough for compatible ROV equipment.

4. CTD Oceanographic Instruments

CTD instruments measure conductivity, temperature, and depth in marine research applications.The LPMBH-3-MP-IM can be integrated into compatible CTD instrument housings.

5. Dissolved Oxygen Sensors

Underwater dissolved oxygen sensors require reliable power and signal connections for environmental monitoring.The three-pin male bulkhead connector provides an electrical feedthrough for compatible sensor configurations.

6. Fluorometer Sensors

Fluorometers are widely used for underwater water-quality analysis and oceanographic research.The LPMBH-3-MP-IM can be installed in compatible fluorometer equipment housings.

7. Subsea Camera Systems

Compact underwater cameras require reliable electrical feedthroughs for power and auxiliary signals.The LPMBH-3-MP-IM provides a low-profile connection option for suitable subsea imaging systems.

8. Underwater Lighting Systems

Underwater LED lights and inspection lamps require dependable electrical connections in marine environments.The connector can be integrated into compatible underwater lighting housings.

9. Hydrophone Arrays

Hydrophone systems require reliable electrical connections for underwater acoustic measurements.The LPMBH-3-MP-IM provides a compact three-contact interface for compatible acoustic instrument assemblies.

10. Underwater Acoustic Modems

Acoustic modem systems use electrical connections for power and signal interfaces.The LPMBH-3-MP-IM can be installed in compatible subsea communication equipment.

11. Deep-Sea Landers

Deep-sea landers use pressure-resistant electrical feedthroughs for instruments, sensors, and monitoring systems.The LPMBH-3-MP-IM provides a bulkhead mounting option for compatible lander instrumentation.

12. Benthic Observatories

Benthic observatories support long-term marine environmental monitoring.The connector can be integrated into compatible sensor and cable assemblies used in these scientific platforms.

13. Environmental Monitoring Systems

Marine environmental monitoring equipment requires dependable underwater connections for sensors and data acquisition systems.The LPMBH-3-MP-IM can be used for compatible temperature, dissolved oxygen, turbidity, and other monitoring instruments.

14. Profiling Floats

Profiling floats require compact electrical feedthroughs for underwater measurement and data collection systems.The low-profile bulkhead configuration is suitable for compatible instrument housings.

15. Offshore Subsea Instrumentation

Offshore monitoring equipment requires reliable electrical connections for underwater sensors and instrumentation.The LPMBH-3-MP-IM provides a compact wet-pluggable bulkhead connection option for compatible subsea equipment.

LPMBH-3-MP-IM vs LPIL-3-FS-IM

Both connectors belong to the Impulse-compatible Low Profile Micro Wet-Pluggable connector family, but they serve different installation purposes.

LPMBH-3-MP-IM

• Three Male Pin Contacts
• Bulkhead Connector
• Panel-Mounted Installation
• Electrical Feedthrough Design
• Internal Teflon-Insulated Leads
• 7/16-20 UNF Mounting Thread
• 2-014 O-Ring Sealing Arrangement
• Suitable for Pressure Housings
• Designed for External Underwater Cable Connections

LPIL-3-FS-IM

• Three Female Socket Contacts
• In-Line Cable Connector
• Cable-Mounted Installation
• Female Socket Configuration
• Suitable for Cable-to-Bulkhead Connection
• Designed to Mate with Compatible Male Bulkhead Connectors

The LPMBH-3-MP-IM is installed on the equipment housing, while the LPIL-3-FS-IM is installed on the external cable.Together, these two connectors provide a practical three-contact underwater electrical connection system.

LPMBH-3-MP-IM vs Standard Micro Circular Bulkhead Connectors

The LPMBH-3-MP-IM and conventional Micro Circular bulkhead connectors serve different equipment integration requirements.

LPMBH-3-MP-IM Low Profile Micro Bulkhead

• Low-profile streamlined construction
• Three male pin contacts
• Bulkhead / panel mounting
• Wet-pluggable connection
• Impulse-compatible interface
• Compact installation geometry
• 10,000 psi mated pressure reference
• Suitable for AUVs and underwater gliders
• Suitable for drag-sensitive platforms
• Designed for compact instrument housings

Standard Micro Circular Bulkhead Connector

• Cylindrical circular body design
• Multiple contact configurations
• Male and female bulkhead options
• Threaded panel mounting
• Compact circular connection interface
• Suitable for ROVs, AUVs, and subsea sensors
• Different electrical and pressure ratings depending on configuration

The LPMBH-3-MP-IM is particularly suitable when a low-profile connector geometry is required.Conventional Micro Circular connectors may be preferable when a cylindrical interface, higher contact density, or alternative mounting configuration is needed.

Installation, Mating and Maintenance Guidelines

1. Check the Equipment Mounting Dimensions

Verify the panel thickness, mounting hole, 7/16-20 UNF thread, and available installation space before machining the pressure housing.

2. Prepare the Mounting Surface

Ensure the mounting surface is flat, clean, and free from scratches, burrs, and contamination around the sealing interface.

3. Inspect the O-Ring

Inspect the reference 2-014 O-ring for cuts, wear, deformation, or contamination.Replace damaged sealing components before installation.

4. Apply Suitable Lubrication

Apply compatible lubricant to the designated O-ring sealing surface according to the manufacturer’s instructions.Avoid contaminating the electrical contact surfaces.

5. Install the Bulkhead Connector

Insert the connector into the prepared mounting position and secure it using the appropriate mounting hardware.Follow the manufacturer’s mounting torque requirements. The original Impulse LPMBH documentation specifies a maximum mounting torque of 100 in-lb.

6. Connect Internal Electrical Leads

Connect the three internal Teflon-insulated leads to the equipment’s electrical system according to the approved pin assignment.Verify polarity and electrical continuity before closing the pressure housing.

7. Inspect the External Mating Interface

Inspect all three male pins for contamination, corrosion, deformation, or foreign particles.

8. Align the Female Connector

Align the male bulkhead connector with the corresponding three-socket female in-line connector.Ensure that the keying and contact positions are correctly aligned before mating.

9. Complete the Mating Operation

Perform the mating operation according to the approved underwater connector procedure.Do not force the connector or apply excessive side loads during mating.

10. Install the Locking Arrangement

Install the compatible locking sleeve or locking hardware and verify that the connection is mechanically secured before deployment.

11. Perform Electrical Testing

Verify electrical continuity, contact resistance, and insulation resistance according to the applicable project requirements.

12. Perform Pressure Testing

Test the complete connector and pressure-housing assembly according to the approved hydrostatic pressure qualification procedure.

13. Post-Deployment Maintenance

After exposure to seawater, rinse the connector exterior with fresh water according to the manufacturer’s maintenance instructions.Inspect the connector body, contact pins, O-ring, mounting hardware, and internal electrical terminations before subsequent use.

Quality Control and Testing

Depending on the approved HYSF configuration and project requirements, quality-control procedures may include:

• Visual inspection
• Dimensional inspection
• Mounting thread inspection
• Bulkhead body inspection
• Contact position verification
• Contact plating inspection
• O-ring inspection
• Electrical continuity testing
• Contact resistance testing
• Insulation resistance testing
• Mating compatibility testing
• Internal lead inspection
• Mounting hardware inspection
• Hydrostatic pressure testing
• Post-pressure electrical performance verification
• Final product inspection

Electrical test reports, dimensional inspection reports, and hydrostatic pressure test documentation can be provided according to agreed project requirements.

Frequently Asked Questions

Q1: What is the LPMBH-3-MP-IM connector?

The LPMBH-3-MP-IM is a three-pin male bulkhead underwater connector from the Impulse-compatible Low Profile Micro Wet-Pluggable Connector Series.It is designed for underwater pressure housings, AUVs, ROVs, underwater gliders, and oceanographic instruments.

Q2: How many contacts does the LPMBH-3-MP-IM have?

The LPMBH-3-MP-IM features three male electrical pin contacts.

Q3: Is the LPMBH-3-MP-IM an in-line or bulkhead connector?

It is a bulkhead connector designed for panel-mounted installation through an underwater equipment housing.The LPIL series is used for in-line cable connectors.

Q4: What is the voltage rating?

The specific product specification lists a reference voltage rating of 250 V AC/DC RMS.

Q5: What is the current rating?

The reference current rating is 5 A per contact, with a reference maximum total current of 15 A.Actual allowable current depends on simultaneous loading, conductor size, temperature, and electrical derating requirements.

Q6: What is the pressure rating?

The reference mated pressure rating is 10,000 psi, approximately 690 bar.

Q7: What is the open-face pressure rating?

The original Teledyne Impulse documentation specifies up to 5,000 psi for the bulkhead connector open-face configuration.

Q8: Is the LPMBH-3-MP-IM a wet-mate connector?

Yes. It belongs to the Low Profile Wet-Pluggable connector family and is designed for underwater mating applications.

Q9: What is the connector body material?

The connector features a molded Neoprene / Chloroprene Rubber body.

Q10: What materials are available for the bulkhead hardware?

Brass is identified in the original Impulse LPMBH engineering drawing. Compatible product configurations also identify 316 stainless steel and optional titanium hardware.

Q11: What type of contacts does the connector use?

The LPMBH-3-MP-IM features three gold-plated male pin contacts.

Q12: What is the mounting thread?

The reference mounting thread is 7/16-20 UNF-2A, with a standard 1/2-inch thread length.

Q13: What O-ring does the connector use?

The original Impulse LPMBH engineering drawing identifies a 2-014 O-ring.

Q14: Does the connector include internal cable leads?

Yes. The original Impulse LPMBH documentation identifies 12-inch Teflon-insulated internal leads.

Q15: Which connector mates with the LPMBH-3-MP-IM?

A compatible three-socket female in-line connector, such as the LPIL-3-FS-IM reference configuration, can be used.The exact mechanical and electrical interface should be verified before ordering.

Q16: Which dummy connector is compatible?

The original Impulse documentation identifies the LPMDC female dummy configuration for male LPMBH connectors. The three-contact version is referenced as LPMDC-3-FS.

Q17: Is the LPMBH-3-MP-IM suitable for AUV applications?

Yes. Its low-profile construction and compact bulkhead installation make it suitable for compatible AUV sensor housings and underwater glider instrumentation.

Q18: Can the connector be installed in an ROV pressure housing?

Yes. It provides a bulkhead electrical feedthrough for compatible ROV pressure housings, sensor enclosures, and subsea instrumentation systems.

Q19: Can titanium hardware be supplied?

Titanium hardware is listed as an optional material in the compatible product specification. Availability should be confirmed for the selected configuration.

Q20: Can hydrostatic pressure test reports be supplied?

Hydrostatic pressure testing and corresponding documentation can be arranged according to agreed project requirements.

Why Choose HYSF SUBSEA LPMBH-3-MP-IM?

The HYSF SUBSEA LPMBH-3-MP-IM Impulse Low Profile Micro Bulkhead 3-Pin Male Underwater Connector provides a compact and reliable electrical feedthrough solution for demanding marine and subsea applications.Its principal features include:

• Three male electrical pin contacts
• Low-profile micro bulkhead configuration
• Panel-mounted electrical feedthrough design
• Impulse-compatible connector interface
• Molded Neoprene / Chloroprene Rubber body
• Brass or 316 stainless steel hardware options
• Optional titanium hardware
• Gold-plated electrical contacts
• 250 V AC/DC RMS reference voltage rating
• 5 A per contact reference current rating
• 10,000 psi mated pressure rating
• 5,000 psi open-face pressure reference
• More than 500 wet-mating cycles reference
• 7/16-20 UNF mounting thread
• 1/2-inch standard thread length
• 2-014 O-ring sealing arrangement
• 12-inch Teflon-insulated internal leads
• Compatible female in-line connector interface
• Suitable for underwater pressure housings
• Suitable for AUV and underwater glider integration
• Suitable for ROV sensor and camera systems
• Suitable for oceanographic instruments
• Suitable for subsea environmental monitoring
• Customized subsea bulkhead solutions
• OEM engineering and manufacturing support

For AUV manufacturers, ROV system integrators, oceanographic research institutions, underwater instrumentation suppliers, and offshore engineering contractors, the LPMBH-3-MP-IM provides a practical three-pin male low-profile underwater bulkhead connection solution.Contact HYSF SUBSEA for product specifications, technical drawings, compatible female connectors, mounting dimensions, locking accessories, customized electrical feedthrough solutions, and quotations for the LPMBH-3-MP-IM Impulse Low Profile Micro Bulkhead 3-Pin Male Connector.