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.