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Measurements
MERLIN rectifier monitors have been designed to carry out the functional checks of rectifier output (voltage and current) required in order to comply with regulatory guidelines. They will quickly repay their capital cost when compared to manual monthly checks.
However, MERLIN rectifier monitors ensure continuous protection of the pipeline:
• They will alert the user immediately when a power failure to the rectifier has been detected (and will also report when it has been restored). They have a built-in 2-3 year back-up battery so that they will continue to monitor rectifier output and report normally even during a prolonged power outage.
• High and low alarms can be set on the rectifier output channels. These will detect a rectifier failure independently from the electrical power supply. For example, a lightning strike may cause the rectifier fuse to blow - the power supply will still be present but the rectifier output will rapidly drop away, leaving the pipeline unprotected.
Enhanced models offer additional CP measurements (ON and OFF potentials) as well as the facility to synchronize remotely with other rectifiers on a pipeline for Close Interval or DCVG (Direct Current Voltage Gradient) survey measurements in the field.
Model |
Electrical Supply |
Rectifier Voltage |
Rectifier Current |
Rectifier 2nd Current |
ON/OFF Potential |
Remote Synch |
Pipeline Locate |
Basic |
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Premium |
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Super |
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Excel |
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Pipe-to-soil potential measurements (Premium and higher) at the rectifier require a reference cell and relay. Remote synchronization (Super and Excel) require a MERLIN solid state Interrupter.