The operation of transformer rectifiers (electrical units that place a voltage onto the pipeline to counteract the electrolytic corrosion reaction) is critical to cathodic protection.  The voltage must be applied consistently and at the correct level:

  • Too low – and the pipeline will be insufficiently protected
  • Too high – and the pipeline may become brittle

Pipeline operators are recommended to check the correct functioning of their rectifiers at monthly intervals.

Manually collecting, monitoring and analysing rectifier measurements is labour-intensive, carries high health and safety risks and is costly. And (very importantly) they can only be reactive – problems can lie undetected for long periods, during which the pipeline is insufficiently protected.  By contrast, MERLIN Rectifier and Solar Station Monitors provide an immediate status of the rectifier.

Rectifier measurements are taken automatically by a MERLIN Transformer Rectifier Monitor installed at the rectifier. This checks that the electrical supply is still present, monitors the voltage and current output and (optionally) can take ON and OFF potential measurements at the rectifier drain point.

MERLIN Rectifier and Solar Station Monitors also offer the facility to synchronize remotely with other rectifiers on a pipeline for CIPS (Close Interval Potential Surveys) or DCVG (Direct Current Voltage Gradient) surveys.  Excel models can additionally control a solid state Interrupter to provide a signal for tracing the pipeline route.

MERLIN Transformer Rectifier and Solar Station Monitors

MERLIN GX Super

  • Electrical Supply

  • Rectifier Output Voltage and Current

  • On/Off Potential

  • Remote Synchronization for Surveys

  • 2 Year Backup Battery Life

  • 4G (LTE Cat.1) and 3G Networks

  • Hourly Check of Rectifier Outputs

  • Immediate Alerts for High/Low Thresholds

  • Weekly Reports for Min, Max and Average on All Channels

  • Surge Protection on All External Inputs and Outputs

Download the datasheet.

US Datasheet

Datasheets require a PDF Reader to view, Adobe Reader can be downloaded for free from www.adobe.com.

Note: Features and specifications are subject to change without prior notice.

MERLIN GX Excel

  • Electrical Supply

  • Rectifier Output Voltage and Current

  • On/Off Potential

  • Remote Synchronization for Surveys

  • 2 Year Backup Battery Life

  • 4G (LTE Cat.1) and 3G Networks

  • Hourly Check of Rectifier Outputs

  • Immediate Alerts for High/Low Thresholds

  • Weekly Reports for Min, Max and Average on All Channels

  • Surge Protection on All External Inputs and Outputs

  • Pipeline Locate

Download the datasheet.

US Datasheet

Datasheets require a PDF Reader to view, Adobe Reader can be downloaded for free from www.adobe.com.

Note: Features and specifications are subject to change without prior notice.

MERLIN DX Super

  • Electrical Supply

  • Rectifier Output Voltage and Current

  • On/Off Potential

  • Remote Synchronization for Surveys

  • 2 Year Backup Battery Life

  • 3G and 2G (GSM) Networks

  • Hourly Check of Rectifier Outputs

  • Immediate Alerts for High/Low Thresholds

  • Weekly Reports for Min, Max and Average on All Channels

  • Surge Protection on All External Inputs and Outputs

Download the datasheet.

International Datasheet

Datasheets require a PDF Reader to view, Adobe Reader can be downloaded for free from www.adobe.com.

Note: Features and specifications are subject to change without prior notice.

MERLIN DX Excel

  • Electrical Supply

  • Rectifier Output Voltage and Current

  • On/Off Potential

  • Remote Synchronization for Surveys

  • 2 Year Backup Battery Life

  • 3G and 2G (GSM) Networks

  • Hourly Check of Rectifier Outputs

  • Immediate Alerts for High/Low Thresholds

  • Weekly Reports for Min, Max and Average on All Channels

  • Surge Protection on All External Inputs and Outputs

  • Pipeline Locate

Download the datasheet.

International Datasheet

Datasheets require a PDF Reader to view, Adobe Reader can be downloaded for free from www.adobe.com.

Note: Features and specifications are subject to change without prior notice.

MERLIN XT Super

  • Electrical Supply

  • Rectifier Output Voltage and Current

  • On/Off Potential

  • Remote Synchronization for Surveys

  • 2 Year Backup Battery Life

  • Iridium Satellite (Meshed Constellation)

  • Hourly Check of Rectifier Outputs

  • Immediate Alerts for High/Low Thresholds

  • Weekly Reports for Min, Max and Average on All Channels

  • Surge Protection on All External Inputs and Outputs

Download the datasheet.

US Datasheet
International Datasheet

Datasheets require a PDF Reader to view, Adobe Reader can be downloaded for free from www.adobe.com.

Note: Features and specifications are subject to change without prior notice.

MERLIN XT Excel

  • Electrical Supply

  • Rectifier Output Voltage and Current

  • On/Off Potential

  • Remote Synchronization for Surveys

  • 2 Year Backup Battery Life

  • Iridium Satellite (Meshed Constellation)

  • Hourly Check of Rectifier Outputs

  • Immediate Alerts for High/Low Thresholds

  • Weekly Reports for Min, Max and Average on All Channels

  • Surge Protection on All External Inputs and Outputs

  • Pipeline Locate

Download the datasheet.

US Datasheet
International Datasheet

Datasheets require a PDF Reader to view, Adobe Reader can be downloaded for free from www.adobe.com.

Note: Features and specifications are subject to change without prior notice.

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