A self-checking analyzer system is provided according to an embodiment of this disclosure. The analyzer system includes a pipeline for receiving a multi-phase fluid flow. The analyzer system also includes a first measuring device configured to provide a first reflected power/insertion loss measurement corresponding to the multi-phase fluid flow, and a second measuring device differing in frequency response from the first measuring device and configured to provide a second reflected power/insertion loss measurement corresponding to the multi-phase fluid flow. The analyzer system is configured to validate the first reflected power/insertion loss measurement using the second reflected power/insertion loss measurement.