Introduction

The Alfa Laval Salinometer DS 205 Rev. 1 is a marine salinity monitoring and alarm unit used to supervise salt concentration in shipboard freshwater generator, evaporator, boiler feed water, condensate and water treatment systems. In marine operation, salinity control is not only a measurement function; it is a protection system for expensive machinery.

If produced water from a freshwater generator contains excessive salt, it can contaminate storage tanks, damage boiler systems, create scale formation and increase corrosion risk. For this reason, Alfa Laval freshwater generator documentation describes the salinometer as the device that continuously checks the salinity of produced water, with an adjustable alarm set point.

The DS 205 Rev. 1 unit shown in the supplied images includes a digital alarm set display, PPM seasalt display, alarm indication, test function, secondary alarm on/off function and rear relay wiring diagram. This makes it very useful for marine engineers during daily operation, troubleshooting and replacement work.

SM MARINE SERVICE™ supplies Alfa Laval DS 205 Salinometers as New Equipment, Used Equipment and Reconditioned Equipment depending on customer requirements and budget.

Alfa Laval Salinometer DS 205 Front Panel

Alfa Laval Salinometer DS 205 Rear Side Wiring Diagram

Product Overview

The Alfa Laval DS 205 Salinometer monitors salinity by working with a conductivity measuring arrangement. Pure freshwater has low conductivity, while dissolved salts increase conductivity. The salinometer uses this principle to monitor salt content and provide an alarm when the value exceeds the selected alarm point.

The front panel of the DS 205 is designed for practical engine room use. It includes a visible digital alarm set display, PPM seasalt display, alarm indicator, up and down setting buttons, test function and secondary alarm control. The rear side of the unit includes a label showing the relay function wiring diagram, which is very helpful for ETOs and marine electricians during installation or troubleshooting.

The DS 205 is commonly associated with freshwater generator installations. Alfa Laval freshwater generator manuals state that the control panel normally contains the salinometer, motor starters, running lights, remote alarm contacts and start/stop preparation.

Alfa Laval DS 205 Digital Display and Alarm Set

Alfa Laval DS 205 Relay Function Wiring Label

Technical Specifications

The supplied rear-side label identifies the unit as Salinometer Type DS 205 Rev. 1 and shows relay functions for primary alarm relay and secondary alarm relay. The salinometer relay outputs allow the unit to interface with ship alarm systems, freshwater generator controls and remote alarm circuits.

DS 205 Rear Nameplate and 115V Indication

Key Features

The Alfa Laval DS 205 is a practical and engineer-friendly salinometer because it provides clear indication, simple operation and straightforward alarm functions.

Key features include:

• Digital alarm set display
• Digital PPM seasalt indication
• Adjustable alarm setting
• Test 10 PPM function
• Primary alarm relay
• Secondary alarm on/off function
• Rear relay wiring diagram
• Suitable for marine freshwater generator systems
• Practical front-panel operation
• Easy troubleshooting for marine electricians
• Strong suitability for used and reconditioned equipment supply

A marine salinometer is important because it allows engineers to detect high salinity before contaminated freshwater enters storage tanks or boiler feed systems. Training and technical materials for freshwater generators commonly describe salinometers as devices used to monitor salt content and trigger an alarm when salt content exceeds the set point.

Alfa Laval DS 205 Operator Front Panel

Marine Applications

The Alfa Laval DS 205 Salinometer is widely used in engine room water quality monitoring systems. Its most important application is freshwater generator salinity supervision. When a freshwater generator produces distillate, the salinometer checks whether the produced water is suitable for use or whether the system must activate an alarm due to high salinity.

Typical marine applications include:

• Freshwater generator outlet monitoring
• Evaporator distillate monitoring
• Boiler feed water protection
• Condensate return monitoring
• Potable water quality monitoring
• Engine room water treatment systems
• Integrated automation alarm systems
• Remote alarm monitoring systems

Vessel types where salinometers are commonly required include container ships, bulk carriers, tankers, offshore support vessels, LNG carriers, LPG carriers, passenger ships, research vessels and naval vessels.

DS 205 Salinometer Rear Wiring and Relay Function

Compatible Systems

The DS 205 Salinometer can be used with freshwater generation and water quality monitoring systems where salinity alarm control is required. It is especially relevant for older Alfa Laval freshwater generator installations and vessels that still operate legacy control panels.

Compatible system areas include:

• Alfa Laval freshwater generator systems
• Marine evaporator control panels
• Boiler feed water monitoring systems
• Condensate monitoring lines
• Remote alarm systems
• Engine room alarm panels
• Marine automation cabinets
• Conductivity sensor systems
• Replacement and retrofit salinometer installations

The DS series is also related to later DS-20 compatible salinometer solutions. Replacement documentation for DS-20 compatible equipment notes use of the same electrode type or equivalent in compatible salinometer systems, which is useful when engineers search for retrofit or replacement options.

Spare Parts Support

SM MARINE SERVICE™ provides sourcing and supply support for Alfa Laval salinometer systems and related components.

Available support may include:

• Alfa Laval DS 205 Salinometer complete unit
• DS 205 Rev. 1 used unit
• DS 205 reconditioned unit
• Conductivity sensor
• Salinity probe
• Relay output components
• Display board
• PCB inspection support
• Terminal blocks
• Alarm setting components
• Wiring accessories
• Freshwater generator control panel spares
• Compatible salinometer replacement units

Alfa Laval DS 205 Front Display Unit

Repair & Technical Services

A salinometer fault can create serious operational inconvenience onboard. If the unit does not read correctly, gives false alarms or fails to trigger alarm output, engineers may lose confidence in freshwater quality monitoring. Regular functional testing and proper troubleshooting are important.

SM MARINE SERVICE™ provides technical support for:

• Alfa Laval DS 205 repair
• Display fault inspection
• Alarm relay testing
• Secondary alarm function checking
• PCB inspection
• Terminal connection inspection
• Conductivity sensor signal checking
• Calibration support
• Functional testing
• Replacement sourcing
• Used and reconditioned supply

Common faults may include no display, wrong PPM indication, alarm not activating, false alarm, defective relay output, loose terminal connection, sensor failure, dirty electrode or cable problem. General salinometer troubleshooting references note that salinity measurement relies on an electrode and that electrode condition, cable condition and buildup can affect correct readings.

Alfa Laval DS 205 Terminal and Relay Wiring Side

Frequently Asked Questions

What is the Alfa Laval DS 205 Salinometer used for?

The Alfa Laval DS 205 is used to monitor salinity level in produced freshwater, especially in marine freshwater generator, evaporator, condensate and boiler feed water systems.

Why is salinity monitoring important on ships?

High salinity can contaminate freshwater storage, damage boiler systems, cause scaling and increase corrosion risk. A salinometer helps engineers detect the problem early.

What does the DS 205 alarm function do?

The alarm function activates when salinity exceeds the selected alarm setting. The supplied unit also shows primary and secondary alarm relay functions on the rear wiring diagram.

Can Alfa Laval DS 205 be repaired?

Yes. Depending on condition, display faults, relay problems, PCB issues, wiring faults and calibration problems can often be inspected and repaired.

Does SM MARINE SERVICE™ supply used or reconditioned Alfa Laval salinometers?

Yes. SM MARINE SERVICE™ supplies New Equipment, Used Equipment and Reconditioned Equipment depending on customer requirements and budget.

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, engine control, offshore automation, industrial automation, marine electronic systems, and ship machinery control systems.

Website

https://www.smmarineservice.com

Email : info@smmarineservice.com

WhatsApp and Viber : +8801818929292

Marketing Contact

Nazmul Hasan Bhuiyan

Mobile (WhatsApp & Viber) : +8801730296909

Conclusion

The Alfa Laval Salinometer DS 205 Rev. 1 is an important marine water quality monitoring device used for salinity alarm and freshwater generator protection. Its digital PPM seasalt display, adjustable alarm setting, relay output and simple operating panel make it practical for marine engineers and ETOs maintaining shipboard freshwater generator systems.

For Alfa Laval DS 205 Salinometer supply, repair, calibration, troubleshooting, spare parts and worldwide technical support, contact SM MARINE SERVICE™ for professional marine automation and engine room equipment solutions.

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