Hey guys,
I am sure this has come up before. I have read that these two will sometimes have slightly different readings but I am still perplexed. I set up my neptune controller last week and calibrated the conductivity probe with the enclosed solution. Currently it's reading my salt at a little over 36 to 37. I calibrated my refractometer using calibration fluid to 35 ppt. Since my Neptune was intermittently alarming I took out about a 0.25 gallon of tank water and let my ATO fill it back up with RODI water. Now my refractometer is reading about 32 ppt. My controller says that the salt is 36.
It seems like these are way off. I would like my salinity to be 35ppt but if I do that using my refractometer then I would imagine my controller would say that my conductivity is 40.
What is going on? Is it my refractometer? (It is about 10 years old) Do I need to recalibrate the Neptune?
Thanks for the help.
I am sure this has come up before. I have read that these two will sometimes have slightly different readings but I am still perplexed. I set up my neptune controller last week and calibrated the conductivity probe with the enclosed solution. Currently it's reading my salt at a little over 36 to 37. I calibrated my refractometer using calibration fluid to 35 ppt. Since my Neptune was intermittently alarming I took out about a 0.25 gallon of tank water and let my ATO fill it back up with RODI water. Now my refractometer is reading about 32 ppt. My controller says that the salt is 36.
It seems like these are way off. I would like my salinity to be 35ppt but if I do that using my refractometer then I would imagine my controller would say that my conductivity is 40.
What is going on? Is it my refractometer? (It is about 10 years old) Do I need to recalibrate the Neptune?
Thanks for the help.