New Apex Salinty question.

[Jej34]

I just purchased and installed and calibrated my new 2016 Apex. I calibrated the salinity probe with a 53.333 fluid that comes with the controller. I checked the salinity of the test solution from Apex with my refract and it's coming up at 42 PPT, not 35 like I was expecting.
Am I Wrong using that Apex solution to recalibrate a refract?

 

[hybridazn]

The probe used to measure salinity on the apex is a conductivity probe. it reads differently than your refractometer.

 

[Jej34]

Correct so, am I right in saying I should not have used 53.333 fluid for my refract as it was not designed for it?

 

[hybridazn]

Correct so, am I right in saying I should not have used 53.333 fluid for my refract as it was not designed for it?

Correct, do not use it to calibrate your refractometer

 

[ngvu1]

something is wrong with the way you calibrate would be my guess. Also what setting, conductivity range, are you using for the salinity probe? I have seen the value changes due to temperature swing but this is too much of a difference. I use mine just see if extreme changes happen and do not pay much attention to the accuracy of it.

 

[reefwiser]

Did you get the solution to temperature? You have to have th 53 ppt to tank to to set it up.