The conductivity sensor in the High Flow Next is calibrated for DP Ultra coolant which, when new, has a very low conductivity (~25uS/cm). The conductivity increases over time. When it gets up to 100uS/cm Aquacomputer recommends replacing the coolant.

The conductivity sensor can measure from 2 to 200uS/cm. Some other brands of coolant have conductivity that is much higher than the sensor can measure. For example, EK Cryofuel spec says conductivity is 1.04mS/cm which is 1040uS/cm. This is far above the maximum that the sensor can measure. EK has stated that Cryofuel conductivity, when new, is actually around 2200uS/cm. If you use this coolant, the conductivity sensor in the High Flow Next is not going to work. I don't know what the conductivity of Corsair coolant is. Corsair just puts their name on products made by other companies so who knows. If you want the conductivity sensor to work properly, use the coolant it was intended for and calibrated for, which is DP Ultra.

Über die Qualität der Kühlflüssigkeit sagt der Wert nichts aus, nur über die Leitfähigkeit.
Je höher der Wert, umso leitfähiger ist die Flüssigkeit.
Was nun besser ist liegt im Auge des Betrachters, EKs Cryo Fuel z.B. ist extrem leitfähig, DP Ultra leitet dagegen eher schlecht, gibt es ein Leck ist DP Ultra daher, aus meiner Sicht, klar die bessere Wahl.
Mit der Zeit wird die Flüssigkeit immer leitfähiger, das soll Dir der Sensor auch zeigen, damit man entsprechend reagieren und die Flüssigkeit tauschen kann.