The service that ARPO offers consists of of effecting in the presence of the client, and sometimes of a representative of a Certifying Society such as BUREAU VERITAS, LOYD GERMANICO, etc., the validation and verification that a control system or safety system meets the characteristics and functionalities specified in the design.

In order to validate this type of systems ARPO prepares acceptance test protocols which allow to validate the components and equipment specifications and to prove physically that its functionality meets the system design specifications. For functional validations sometimes field simulator must be used in order to physically verify the operation of the system.