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ONLINE ELECTRONICS LTD
1. GENERAL DESCRIPTION
Online Electronics' versatile 3002RS 3004 3011 ROV system is a 22Hz Electromagnetic (EM)
pipeline pig monitoring system used for pig locating, tracking and signalling subsea. The
system can be used to find lost and stuck pigs, to confirm a pig has left or arrived at a
particular location, to count the number of pig passages at a particular location and for general
monitoring of pig movement.
The system consists of an EM transmitter fitted to the pig which emits a 22Hz EM signal which
can be detected using the 3002RS receiver, 3011 EM POD and 3004 antenna outside the
pipeline.
When used for pig location the inherent "Null Spot" of the transmitter can be detected which
allows the location of the transmitter to be determined with an accuracy of a few centimetres.
The 3002RS is a portable, battery operated, EM receiver designed to receive 22Hz pulsing or
continuous signals. The receiver has loudspeaker and headphone audio outputs and an easy to
interpret, backlit display which indicates signal strength and the number of detected 22Hz
events. It also comes with simple sensitivity controls, 22Hz indicators and battery test
functions.
The 3011 EM POD is a subsea receiver which communicates with the 3002RS via a serial,
RS232, data link. The 3011 EM POD receives 22Hz electromagnetic signals from the 3004 EM
antenna, digitises them, and then transmits them to the 3002RS over the RS232 link.
The 3004 EM antenna is designed for use by ROV. The antenna allows the operator to locate
22Hz EM transmitters by observing the signal level received and the relative position of the
antenna.
3002RS_5002_A01
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