Key Features of PR Electronics 5104B
Intrinsically safe signal interface for hazardous areas
One of the main reasons the 5104B is used onboard tankers and offshore vessels is its suitability for hazardous-area instrumentation loops. It acts as an interface between field devices installed in Ex zones and the safe-area control system, helping maintain system safety and signal integrity.
Galvanic isolation for stable signal transmission
Marine environments often create electrical noise, grounding challenges, and interference between instrumentation loops. The 5104B’s galvanically isolated design helps reduce these issues and supports more reliable analog signal transfer.
Repeater power supply function for transmitter loops
The module is designed not only to isolate signals but also to support field transmitter loops through repeater/power supply functionality. This is especially useful where 4-20 mA process transmitters are used in tank level, pressure, temperature, or flow applications.
Dual-channel configuration for compact panel installation
The label indicates channel 1 and channel 2 input/output sections, making the 5104B a practical compact solution for marine control cabinets where multiple analog loops must be handled within limited panel space.
Suitable for marine automation retrofits and spare support
Many ships continue to operate legacy automation and cargo instrumentation systems where PR Electronics modules are already installed. For those vessels, replacing only the failed interface module is often much more practical than redesigning the full signal cabinet.
Technical Specifications Overview
The exact configuration should always be verified from the installed unit label, vessel drawing, and manual, but the supplied unit clearly indicates the following general technical information:
| Item |
Details |
| Manufacturer |
PR Electronics A/S |
| Model |
5104B |
| Product Type |
Repeater / Power Supply |
| Function |
Signal isolation, repeater supply, hazardous area interface |
| Channel Arrangement |
Dual channel |
| Typical Signal Type |
Analog process loops such as 4-20 mA |
| Supply Range Shown on Label |
24–250 VDC / 24–230 VAC |
| Application |
Hazardous area instrumentation and marine automation panels |
| Typical Marine Use |
Tank instrumentation, process transmitters, alarm and monitoring systems |
Marine Applications
The PR Electronics 5104B is particularly relevant in vessels and offshore systems where hazardous area instrumentation is present or where isolated analog signal transfer is required. Typical marine applications include:
- Cargo tank level transmitter loops
- Pump room pressure or gas-related monitoring systems
- Engine room process instrumentation
- Boiler, steam, and utility transmitter interfacing
- Tank sounding and process monitoring systems
- Cargo automation systems on oil and chemical tankers
- Offshore process skids and instrumentation cabinets
- General ship automation panels using isolated 4-20 mA loops
This makes the 5104B useful not only for tanker cargo systems, but also for engine room monitoring and other marine automation applications where a field signal must be safely repeated and isolated before entering the control system.
Spare Parts Support and Replacement
When a PR Electronics 5104B fails onboard, the result may be loss of transmitter signal, unstable loop performance, or interruption of hazardous-area process monitoring. In such cases, the most important step is to identify the exact module version and confirm the signal loop function before replacement.
SM MARINE SERVICE™ can support customers with:
- PR Electronics 5104B supply
- Used and reconditioned 5104B modules
- Marine automation spare parts sourcing
- Signal isolator and repeater power supply replacement
- Photo-based identification of obsolete interface modules
- Support for matching replacement from existing panel hardware
Before ordering, it is best to confirm:
- Model number and suffix on the installed module
- Input/output signal type
- Supply voltage used onboard
- Whether the loop is hazardous-area certified
- The connected field instrument type such as pressure, level, temperature, or flow transmitter
This reduces the risk of wrong replacement and helps ensure compatibility with the vessel’s existing control system.
Repair and Technical Service Considerations
Although modules like the 5104B are usually replaced rather than heavily repaired onboard, technical support is still important for diagnosing whether the fault is in the module itself, the field loop, or the receiving control system. Common troubleshooting steps include:
- Checking power supply presence at module terminals
- Verifying transmitter loop current and polarity
- Inspecting output signal continuity to PLC or monitoring system
- Reviewing hazardous-area loop wiring against the control drawing
- Checking whether the issue is isolated to one channel or both channels
- Confirming field device health before replacing the isolator module
For marine operators maintaining older automation systems, SM MARINE SERVICE™ can assist with replacement sourcing, spare support, and general marine automation technical coordination for instrumentation interface modules like the PR 5104B.
Why Choose SM MARINE SERVICE™
SM MARINE SERVICE™
Bangladesh Office
Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh
China Warehouse and Support Center
Shanghai, China
SM MARINE SERVICE™ supplies both New Equipment and Reconditioned Equipment depending on customer requirements and budget. We provide worldwide supply, sourcing, repair, calibration, technical support and spare parts services for marine automation, navigation, communication and marine electronic systems.
Website : https://www.smmarineservice.com
Email : info@smmarineservice.com
WhatsApp and Viber : +8801818929292
Marketing Contact: Nazmul Hasan Bhuiyan
Mobile WhatsApp and Viber : +8801730296909
Conclusion
If you are looking for PR Electronics 5104B repeater power supply, marine signal isolator, hazardous area interface module, or replacement spare parts for shipboard automation systems, SM MARINE SERVICE™ can support your requirement. We help shipowners, chief engineers, technical superintendents, marine workshops, and repair companies with marine automation spare parts sourcing, reconditioned equipment, technical identification support, and worldwide marine supply service for critical instrumentation modules.
