A device for sampling, preparing and analysing a sample, for example a suspension, comprising: - a sampling device adapted to sampling a fluid sample, - at least one sample preparation unit (B, C) adapted to prepare the sample, and - at least one analysing unit, wherein the device for sampling and analysing a sample is adapted to be placed in direct vicinity to a process pipe and the sampling device is adapted to sample a fluid sample directly from a gate of the process pipe, wherein the at least one sample preparation unit (B, C) comprises: a first sample preparation unit comprising a first chamber and a first screen, wherein the first screen is a coarse screen, which is provided in an upper portion of the first chamber of the first sample preparation unit, characterized by the at least one sample preparation unit (B, C) comprising further a second sample preparation unit, wherein the first and second sample preparation units are interconnected by means of an interconnection pipe, wherein the second sample preparation unit comprises a second chamber and a second screen, wherein the first chamber is placed above the second chamber, and wherein the interconnection pipe is connected on one end of the interconnection pipe to the first chamber above the first coarse screen to collect filtered sample when in use, and wherein the interconnection pipe is connected on the other end of the interconnection pipe to the second chamber, wherein the first and second chambers (1, 5) and their interconnection are configured so that, in use, no part of a fluid sample can be moved from the first to the second chamber by means of gravity only. - a sampling device adapted to sampling a fluid sample, - at least one sample preparation unit (B, C) adapted to prepare the sample, and - at least one analysing unit, wherein the device for sampling and analysing a sample is adapted to be placed in direct vicinity to a process pipe and the sampling device is adapted to sample a fluid sample directly from a gate of the process pipe, wherein the at least one sample preparation unit (B, C) comprises: a first sample preparation unit comprising a first chamber and a first screen, wherein the first screen is a coarse screen, which is provided in an upper portion of the first chamber of the first sample preparation unit, characterized by the at least one sample preparation unit (B, C) comprising further a second sample preparation unit, wherein the first and second sample preparation units are interconnected by means of an interconnection pipe, wherein the second sample preparation unit comprises a second chamber and a second screen, wherein the first chamber is placed above the second chamber, and wherein the interconnection pipe is connected on one end of the interconnection pipe to the first chamber above the first coarse screen to collect filtered sample when in use, and wherein the interconnection pipe is connected on the other end of the interconnection pipe to the second chamber, wherein the first and second chambers (1, 5) and their interconnection are configured so that, in use, no part of a fluid sample can be moved from the first to the second chamber by means of gravity only. a first sample preparation unit comprising a first chamber and a first screen, wherein the first screen is a coarse screen, which is provided in an upper portion of the first chamber of the first sample preparation unit, characterized by the at least one sample preparation unit (B, C) comprising further a second sample preparation unit, wherein the first and second sample preparation units are interconnected by means of an interconnection pipe, wherein the second sample preparation unit comprises a second chamber and a second screen, wherein the first chamber is placed above the second chamber, and wherein the interconnection pipe is connected on one end of the interconnection pipe to the first chamber above the first coarse screen to collect filtered sample when in use, and wherein the interconnection pipe is connected on the other end of the interconnection pipe to the second chamber, wherein the first and second chambers (1, 5) and their interconnection are configured so that, in use, no part of a fluid sample can be moved from the first to the second chamber by means of gravity only.