TelGas™ is able to capture data triggered by events so that the data relating to the event can be stored in a database for later analysis. TelGas™ has the ability to record high definition data before and after the event so that the cause of the event can be fully investigated. In addition, TelGas™ has a unique ability to replay information from the database via the mimic display. This means that all plant parameters can be viewed on a second by second basis leading up to and beyond the point when the event occurred. Events are also tagged with an alarm message which displays on both live and replay mimics synchronised with the data