Rectifier Monitors

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.

To be allowed to carry out functional rectifier checks, CP technicians must be trained on different electrical systems (AC supply and DC output) and many rectifier sites are remote and difficult to access.

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.

In order to provide reliable communications anywhere in the world, MERLIN rectifier monitors use two different types of communication, 3G/2G and Satellite. Regardless of the type of rectifier monitor or communication, all data is automatically transmitted in a management report to the system HQ where it is displayed and archived in Abriox’s MERLIN CPSM software or online via iCPSM.

Because they report to a common software platform, different rectifier monitor types can be mixed together in the same network.
MERLIN DX Transformer Rectifier Monitors (3G/2G)

MERLIN DX Transformer Rectifier Monitors are a range of small, compact Remote Monitoring Units (RMUs) offering different measurement specifications. These monitor’s are usually housed within the rectifier cabinet but may also be supplied in their own separate enclosure ready for mounting adjacent to the rectifier. They communicate using SMS (text) messaging over the 3G/2G network and can be supplied with either internal or external antenna, depending on the material of the rectifier enclosure.
Learn More
MERLIN XT Transformer Rectifier Monitors (Satellite)

MERLIN XT is a compact, durable field unit that monitors the operation of a rectifier or solar station. It is designed for remote areas where 3G/2G coverage is inadequate but can be integrated with 3G/2G-based MERLIN units for a total network monitoring solution. MERLIN XT Transformer Rectifier Monitors are mounted externally to the rectifier or solar station. These model’s use satellite communications and have an internal antenna; therefore they require a view of the open sky.
Learn More
Share by: