Overview
Use of a viscometer within a GPC/SEC system requires a source of a concentration signal to complete the necessary calculations. The difficulty is that the DRI Detector, which is usually utilized for this task, must deliver a corresponding concentration signal for each point on the viscosity curve. This is possible with two separate instruments, however precision of the results will be limited due to the volume difference of the detectors. A combo instrument, where both detectors are integral part of each other, overcomes these limitations and allows a much better determination of the sample under investigation.