|dc.description.abstract||The Refinería Costarricense de Petróleo S.A. is the company of Costa Rica for excellence in charge of supplying hydrocarbons in the whole territory. One of the energy products that it distributes is the liquefied petroleum gas.
Currently, at the plant of Moin in Limon, there are three spheres for the storage of LPG which is used for delivering to the whole country. These spheres, on average, have a capacity of 22 thousand barrels of product available for sale; however, expansion plans are to have a greater number of spheres, which, due to the nature of the product, should be kept under certain special conditions that allow safety while it is stored at the plant.
It is for this reason that is required to design a measurement and control system prototype for these conditions in each sphere, to comply with certain regulations regarding this type of activity (including NFPA, IEC, API). Currently, it has a measuring and control system based on a PLC5, sensors and actuators; however, several components and sub-stages have to be redesigned to obtain the benefits of having a system that meets basic standards of monitoring. It is necessary, therefore; to use the adequate principles of detection, technology drivers PESC endorsed by the IEC-61508, the network design MODBUS RTU Master / Slave to allow remote reaches to have more specific conditions in the field, in conjunction with the design of a point to point wireless link to achieve remote viewing of data, that uses the FHSS technique to make the link Interference versatile.||es