Operation; Tracking - CDI CD42-STS User Manual

CD42-STS Subsea Diver/ROV Pig Location and Tracking System
OPERATION: TRACKING/LOCATING
LED Array
The operator readout for tracking and locating is the 16-LED display.
It is read from left to right (minimum to maximum). The LED behavior
simulates the movement of the needle on an analog meter.
The display contains a peak hold indication whereby an LED will light
to indicate the maximum averaged signal received by the CD42-STS
receiver. As the signal level increases (or the transmitter gets closer) the
peak LED will light and shift to the right and as the signal diminishes the
peak LED will shift to the left. The LED indicators that are below the peak
LED will pulse to indicate the pulses received by the transmitter.
Tracking a Moving Pig
The CD42-STS system must be within a few meters of a pipeline, with
the antenna held parallel to the pipeline. Typically, the diver or ROV
operator will set up with
the antenna parallel to
the pipeline in a location
where he knows the pig
will pass and wait.
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