This document specifies the performance requirements on data acquisition and handling systems (DAHS) regarding implementation of the procedures defined in prEN 17255-1 including data acquisition; data processing; data storage; data output; generation of reports; system functions; data security; documentation. This document supports the requirements of EN 14181 and legislation such as the IED and E-PRTR. It does not preclude the use of additional features and functions provided the minimum requirements of this document are met and that these features do not adversely affect data quality, clarity or access. This document does not cover additional requirements for multiplexing systems where gases are sampled from multiple sources.