I've been using EK Cryofuel clear premix for the last few months and my HF Next says everything is in the green, 100% quality...
That is surprising because the conductivity of Cryofuel is far higher than the conductivity sensor in the High Flow Next can measure. What conductivity value is the sensor reporting? The sensor can measure from 2uS/cm to 200uS/cm. Note the “u” means micro. EK claims Cryofuel has "low electrical conductivity". The product
WEB PAGE states that the conductivity of Cryofuel is 1.4 mS/cm which is 1040 uS/cm. This is ~5X higher than the conductivity sensor can measure.
the conductivity sensor is more or less useless for coolants like the Cryofuel, or other non-glycol based concentrates. the reading will be high from the start.
if you switch to DP ultra (after a thorough flush) the reading should drop way down and the sensors will make sense.
I agree, There was a long discussion about this on the English forum in 2021. Someone was using Cryofuel and could not understand why the conductivity sensor in their High Flow Next was not working properly. The conversation begins
HERE with a post from torexko and continues through the thread with posts about other things mixed in. He contacted EK who
STATED that the initial conductivity of Cryofuel is actually ~2330 uS/cm, which is ~11.6X higher than the sensor can measure. Cryofuel’s corrosion inhibitor is sodium 2-ethylhexanoate. Conductivity starts out very high and decreases as the inhibitor forms a protective coating on metal surfaces. It stabilizes around 1040 uS/cm.
DP Ultra’s conductivity starts out very low at ~10 uS/cm and increases over time. When it gets up to ~100 uS/cm, Aquacomputer recommends replacement. They expressed the opinion that using a coolant with 1000uS/cm is like using
RIVER WATER and using a highly conductive coolant can accelerate corrosion and cause very bad things to happen if it gets onto an energized circuit. They also
STATED that the conductivity sensor in the High Flow Next will not work with Cryofuel due to its very high conductivity. If you want the conductivity sensor to work properly, use DP Ultra.