PCMx Operation Manual
© 2021 Radiodetection Ltd 19
Connecting
Transmitter to Pipeline
WARNING: Appropriate safety procedures must be
followed before removing pipeline CP
connection. Only personnel trained and
qualified to work on rectifiers should remove
CP connections.
Note: Always switch off the rectifier before connecting
leads.
1. Disconnect both pipe and anode cables from the
rectifier.
2. Ensure the transmitter is turned off.
3. Connect the White signal output lead to the pipe
cable.
4. Connect the Green signal output lead to a
suitable anode cable.
Note: If connections are reversed the current direction
arrow on the Locator will point in the wrong
direction.
Use an isolated low resistance ground such as a
sacrificial magnesium anode or ground bed. When
connecting to an electrical isolation joint the other pipe
section can often provide a suitable ground connection.
Care must be taken when using an earth stake as the
resistance is often not low enough. The stake must be
positioned at least 45m (150 feet) from the pipe to ensure
an even current distribution.
5.1 Transmitter to pipeline
connections
Cathodic Protection Rectifier
Single rectifier providing impressed CP current to single
pipeline.
Rectifier is connected to anode and pipeline. Power
supply from 110/220V AC mains.
Fig. 5.1: Rectifier connection to pipeline
Fig. 5.2: PCM transmitter connection to pipeline
Disconnect both cables for pipeline and anode from the
rectifier terminals.
Failure to disconnect cables from rectifier will cause
unstable PCM signals, and may cause possible damage
to the PCM transmitter.
Connect the PCM transmitter to the cables, white lead to
pipeline cable, and green lead to anode cable. Use the
mains power supply for the transmitter or internal
batteries for Tx-25.
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