Inline: For inline analysis, a sensor can be placed in a process vessel or stream of flowing material to conduct the analysis.
Online: Analysers which are connected to a process, and conduct automatic sampling, can be called online (or on-line) analysers or sometimes inline (or in-line) analysers.
This means that online and inline analyses permit continuous process control.
Offline and atline analyses, on the other hand, are characterized by manual sampling followed by discontinuous sample preparation, measurement and evaluation. The material properties can change during the time between sampling and the availability of the results, so direct process control is not possible.
A bypass line is recommended in terms of process control to prevent a shutdown or lost product. If you have to clean, calibrate or validate ypour analyser a lot, then a bypass is the best solution.