How does temp affect salinity testers

[Oceanman5]

At my LFS they use an Icecap digital salinity tester. However I noticed that my salinity reads differently depending on the temperature.
Does anybody know why?

 

[John Doe]

At my LFS they use an Icecap digital salinity tester. However I noticed that my salinity reads differently depending on the temperature.
Does anybody know why?

I think it has something to do with the evaporation of water. When the temperature is higher, the evaporation of water is greater, so the concentration of salt becomes higher.

 

[Dburr1014]

https://reefkeeping.com/issues/2004-07/rhf/index.php

 

[Randy Holmes-Farley Verified Community Expert]

The ice cap should not have a temp effect unless it is not well implemented by the company.

How large of an effect are you talking about and how did you measure it? If it is at the lfs, how can you be sure it is a temp effect?

Best way to check is take some tank water, measure the salinity, then let it cool to room temp and measure again.

 

[Oceanman5]

The ice cap should not have a temp effect unless it is not well implemented by the company.

How large of an effect are you talking about and how did you measure it? If it is at the lfs, how can you be sure it is a temp effect?

Best way to check is take some tank water, measure the salinity, then let it cool to room temp and measure again.

I actually work at this LFS so I've noticed that when people bring their water samples which has sat in their car (83-90 F) the icecap pen shows once result and then when I let it cool, I get a different reading. I've seen salinity changes of about +/- 1.002. For example 1.025 and then 1.023. I haven't yet found a correlation whether a decrease in temp also decreases salinity

 

[Randy Holmes-Farley Verified Community Expert]

I actually work at this LFS so I've noticed that when people bring their water samples which has sat in their car (83-90 F) the icecap pen shows once result and then when I let it cool, I get a different reading. I've seen salinity changes of about +/- 1.002. For example 1.025 and then 1.023. I haven't yet found a correlation whether a decrease in temp also decreases salinity

Actual salinity does not change at all with temp.

The conductivity the ice cap measures is corrected internally for temp effects, but either the correction is not implemented perfectly, or the temps are outside its corrective range.

 

[Oceanman5]

Actual salinity does not change at all with temp.

The conductivity the ice cap measures is corrected internally for temp effects, but either the correction is not implemented perfectly, or the temps are outside its corrective range.

ah okay got it thanks