Introduction

The Alfa Laval Salinometer DS-206 is a marine salinity level monitoring unit designed to measure and alarm the salt content of produced freshwater in shipboard freshwater generators, evaporators, condensate systems, and boiler feed water applications. In marine operation, correct salinity monitoring is essential because excessive salt contamination can damage boilers, reduce freshwater quality, create scaling, and increase corrosion risk.

The supplied DS-206 images show a professional Alfa Laval salinity monitoring panel with continuous salinity level display, salinity alarm level setting, test function, electrode or cable malfunction alarm, secondary alarm on/off function, rear wiring diagram, alarm relay terminals, electrode unit terminals, and 4-20 mA output terminals. This makes the DS-206 highly practical for marine engineers, ETOs, and technical superintendents who need clear operating indication and reliable alarm outputs.

Alfa Laval’s marine freshwater generation systems are designed to produce freshwater with very low salinity, and Alfa Laval states that its freshwater generation solutions can ensure freshwater quality below 2 ppm salinity. The salinometer plays a key role in protecting that water quality by continuously supervising the produced water and triggering alarm action when the salinity level exceeds the selected limit.

SM MARINE SERVICE™ supplies Alfa Laval DS-206 Salinometers as New Equipment, Used Equipment, and Reconditioned Equipment depending on customer requirements and budget.

Alfa Laval Salinometer DS-206 Front Panel

Alfa Laval Salinometer DS-206 Rear Wiring Diagram and Nameplate

Product Overview

The Alfa Laval DS-206 Salinometer works by receiving a signal from an electrode unit installed in the freshwater or distillate line. As salt content increases, the conductivity of the water changes. The salinometer interprets this conductivity signal and displays the salinity level in ppm seasalt. If the measured salinity exceeds the preset alarm level, the unit activates alarm outputs so engineers can take immediate corrective action.

The front panel is divided into clear operating zones. One area shows continuously measured salinity level in ppm seasalt. Another area allows the operator to set the salinity alarm level. The test function allows crew to perform a test at a preset 10 ppm level, while the alarm section indicates malfunction of the electrode or cable and preset alarm level exceeded. This layout is easy to understand during daily engine room operation.

On the rear side, the unit label shows the terminal arrangement for mains supply, alarm relay A, alarm relay B, electrode unit wiring, and 4-20 mA signal output. The rear label also identifies the unit as Salinometer DS-206, Version 1A, Item 98525656-01, with a visible serial number.

DS-206 Salinity Level Monitoring Front Display

DS-206 Terminal Wiring and Electrode Unit Connection

Technical Specifications

Alfa Laval freshwater generator documentation for DS-series salinometers describes salinity measurement of produced distillate with adjustable alarm functions, installation requirements, testing, and electrode maintenance. Alfa Laval also recommends cleaning freshwater generator salinometer electrodes regularly as part of good maintenance practice.

Alfa Laval DS-206 Product Label, Item Number and Wiring Diagram

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Key Features

The Alfa Laval DS-206 is designed for reliable salinity monitoring in marine freshwater generation and water quality systems. Its design is practical for shipboard operators because it provides simple status indication, easy alarm adjustment, and clear test functions.

Key features include:

• Continuous salinity level monitoring
• Digital ppm seasalt display
• Adjustable salinity alarm level set
• Alarm indication for electrode or cable malfunction
• Preset alarm level exceeded indication
• Test button for salinity level preset to 10 ppm
• Alarm on/off control
• Secondary alarm on/off function
• Alarm Relay A and Alarm Relay B output
• 4-20 mA signal output
• Electrode unit connection
• Marine control panel installation
• Suitable for freshwater generator and boiler feed water protection

The DS-206 is especially useful for vessels where engineers need both local display and alarm relay integration with engine room alarm systems or integrated automation systems.

Alfa Laval DS-206 Operator Front View

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Marine Applications

The Alfa Laval DS-206 Salinometer is used wherever salinity monitoring is required to protect marine water systems. The most common application is freshwater generator distillate monitoring, where the unit checks whether produced freshwater is acceptable for storage, boiler feed, or general ship use.

Typical marine applications include:

• Freshwater generator outlet monitoring
• Evaporator distillate monitoring
• Boiler feed water salinity protection
• Condensate return monitoring
• Freshwater storage quality supervision
• Engine room water treatment systems
• Integrated automation alarm monitoring
• Remote alarm and machinery monitoring systems

Vessel types using salinometers include container ships, bulk carriers, oil tankers, chemical tankers, LNG carriers, LPG carriers, passenger vessels, offshore supply vessels, FPSO units, naval vessels, and research ships.

DS-206 Rear Connection Diagram for Marine Installation

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Compatible Systems

The DS-206 is suitable for integration with marine freshwater generation and water quality monitoring systems. It is commonly related to Alfa Laval freshwater generator installations and engine room alarm systems where salinity must be monitored continuously.

Compatible system areas include:

• Alfa Laval freshwater generator systems
• Marine evaporator control panels
• Boiler feed water monitoring systems
• Condensate monitoring lines
• Engine room alarm panels
• Integrated automation systems
• Conductivity electrode systems
• Remote alarm circuits
• Marine control cabinets
• 4-20 mA monitoring systems

Alfa Laval freshwater generator product information emphasizes the need for high quality freshwater with low dissolved solids, which makes salinity monitoring an important part of the total freshwater generation system.

Alfa Laval DS-206 Panel for Freshwater Generator Control System

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Spare Parts Support

SM MARINE SERVICE™ supports sourcing and supply for Alfa Laval DS-206 salinometer units and related spare parts.

Available support may include:

• Alfa Laval DS-206 complete unit
• DS-206 Version 1A replacement unit
• Item 98525656-01 salinometer
• Electrode unit
• SL80AL electrode compatible parts
• Conductivity sensor
• Salinity probe
• Display board
• Alarm relay components
• Terminal blocks
• Wiring connectors
• 4-20 mA output components
• PCB inspection and replacement support
• Freshwater generator control panel spares
• Used and reconditioned Alfa Laval salinometers

DS-206 Salinometer Rear Terminal and Label View

Repair & Technical Services

Salinometer faults can interrupt freshwater generator operation and create uncertainty about water quality. Common issues include unstable reading, no display, wrong salinity indication, defective electrode, cable fault, alarm relay failure, false alarm, alarm not activating, and dirty conductivity sensor.

SM MARINE SERVICE™ provides technical support for:

• Alfa Laval DS-206 repair
• Display fault inspection
• Alarm relay testing
• 4-20 mA output verification
• Electrode signal checking
• Terminal connection inspection
• PCB inspection
• Functional testing
• Calibration support
• Replacement sourcing
• Technical consultation
• Worldwide spare parts supply

General salinometer troubleshooting references note that correct measurement depends on electrode condition, cable condition, and cleanliness of the electrode surface.

Alfa Laval DS-206 Electrical Connection and Alarm Relay Diagram

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Frequently Asked Questions

What is the Alfa Laval DS-206 Salinometer used for?

The Alfa Laval DS-206 is used for continuous salinity level monitoring in marine freshwater generators, evaporators, condensate systems, and boiler feed water applications.

What does ppm seasalt mean on the DS-206?

PPM seasalt indicates the measured salt concentration level in the water. This helps engineers decide whether produced freshwater is acceptable or whether alarm action is required.

What is the purpose of the electrode unit?

The electrode unit senses conductivity changes in the water. Higher salt content increases conductivity, allowing the salinometer to detect salinity level.

What alarms are available on the DS-206?

The supplied unit shows alarm indications for electrode or cable malfunction and preset alarm level exceeded. The rear wiring diagram also shows Alarm Relay A and Alarm Relay B terminals.

Can the DS-206 be repaired?

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

Does SM MARINE SERVICE™ supply used or reconditioned DS-206 units?

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-206 is an important marine salinity monitoring and alarm unit used to protect freshwater generators, evaporators, boiler feed water systems, and condensate lines from salt contamination. Its digital salinity display, alarm setting display, electrode monitoring, alarm relay outputs, and 4-20 mA output make it a practical solution for shipboard water quality supervision.

For Alfa Laval DS-206 salinometer supply, repair, calibration, troubleshooting, spare parts, electrode unit support, and worldwide technical assistance, contact SM MARINE SERVICE™ for professional marine automation and engine room equipment solutions.