PEMEX has renewed the maintenance and continuous technical assistance contract at the sulphur recovery plants 1, 3, 4, 5 and 6 in the Ing. Héctor R. Lara refinery in Cadereyta, Nuevo León, México. The objective of the contract is to ensure the correct and long term functioning, along with efficiency of the optimised adaptive ADEX control system in order to minimise un-planned stoppages at the plants. This includes immediate remote assistance and on-site response within 24 hours in the event of any operational issue which requires the intervention of ADEX engineers.