Abriox

REMOTE SYNCHRONISATION

This new feature enables TRs on the same pipeline to synchronise their output and interrupt it according to a precise timing interval. Synchronised interruption is typically required for CIPS (Close Interval protection Surveys) and DCVG (Direct Current Voltage Gradient) surveys. The interruption may be switched on and off, or the cycle changed, from a cellphone in the field or from the CPSM software.

The MERLIN TRs drive an external 12V relay, which can be electromechanical or solid state. They use GPS to synchronise their clocks and maintain synchronisation at all times.

The option, available with 5-channel Merlin TR Monitors (with internal or external antennas), consists of:

• GPS synchronisation hardware and firmware (internal to MERLIN)

• External GPS antenna (combined GPS/GSM antenna also available)

• External MERLIN Interrupter

Abriox’s MERLIN Interrupter is designed specifically for precise solid state interruption of TRs connected to a buried pipeline. It fails safe and switches the TR output loads encountered under the temperature, environmental and electrical conditions experienced in a TR cabinet. All Merlin units automatically maintain synchronisation with each other.

The patterns that are supported cater for both CIPS and DCVG surveys. CIPS surveys usually require the majority of the pattern to be ON to maintain the CP protection of the pipeline. DCVG surveys are the reverse and usually have a longer OFF than ON so that a short “blip” of ON can be seen by the survey tool.

The interrupter settings are specified to a resolution of 0.1 seconds (although the actual pattern precision is 1ms).

The MERLIN Interrupter can also be used for switching the TR output on and off remotely and for instant OFF potential measurement at the TR.

Note: In countries where mercury relays are allowed, these can be used instead of the MERLIN Relay Unit and will offer a highly reliable, compact and cost effective solution. For very occasional use an electromechanical relay can also be used; however, outputting interrupter patterns is likely to exceed the relay contact life after only a few weeks of continuous use.