Online's EMTx20 series of 22Hz electromagnetic transmitters are fitted to pigs to allow locating and tracking in any onshore and offshore pipeline including buried pipelines, pipelines carrying gas or liquid and in pipeline bundles. The transmitters can be customised as required - for example the transmitter power level can be adjusted to achieve the optimum balance between signal strength and battery life. Additionally different pulse rates allow for differentiation within a pig train.
An inherent electromagnetic null spot is detectable using an electromagnetic antenna meaning that the operator can confirm the location of the transmitter to within a few centimetres. This greatly reduces vessel and operational downtime by facilitating the process of locating a stuck pig or confirming if a pig has left the launcher or been successfully received.