What Conversion charts are you guys using ?

[TandN]

I am tring to figure out what everyone is using to to convert conductivity to salinity to density. I ask because my probe in the Profulix's fluid reads the following

Profulix 50 mS Fluid

conductivity 50 mS
salinity 32.8
density 1.0229

When I look @ Pinpoints conversion chart 50 mS should be

http://www.americanmarineusa.com/sa...conversion.html

salinity 32.8
density 1.0242

So as you can see the salinity is the same but the density is off.

Even RHF reefleeping article says

http://www.reefkeeping.com/issues/2004-06/rhf/index.php

salinity 33
density 1.0249

So seems like Pinpoint's chart and RHF is the same

What do you guys think ????

 

[Boomer]

See your other post

Here is another one for you

http://www.fivecreeks.org/monitor/sal.html

You also missed this one hidding in Randy's article

Temperature Corrections for Hydrometers
http://reefkeeping.com/issues/2004-07/rhf/index.htm

form it:

Table 1 below (supplied by Johan Thelander) and in this linked calculator (written by Simon Huntington).

And the Simon link is for Sg and Salinity. For us leave the temps as is, all at 77 F for refract only.

http://www.reefkeeping.com/issues/2004-07/rhf/conversion.htm




Your Pinpoint link did not work. This is it ...........


http://www.americanmarineusa.com/salinityconversion.html

And I and Randy have always had issues with it

53.0 35.00 1.0259 (should be 1.0265)

Reason is, he is going by a 20 C Soils Hydrometer and not a 25 C/ 77F Hydrometer like we use and using it in 72 F water and not 77 F water as we do. Also try to get away from the word "Density" and use Sg. We do not use Density but Sg and they are not the same. See your other post for details

 

[Randy Holmes-Farley]

FWIW, I never convert readings for my own purposes. My meter reads in units of mS/cm, and I try to keep the tank at 53 +/- 1 mS/cm to match natural seawater (with a slight manual subtraction on my part since my meter reads a tad high and is not easy to adjust (actually, it is the electrode itself and not the meter that is the issue, but that's a more advanced detail)).

Conductivity and ppt are what chemical oceanographers usually talk about, not specific gravity. About the only time I ever convert between sg, density, ppt, and conductivity is when someone asks a question that requires it.

 

[TandN]

Thanks guys. The reason and the only reason why I use density is for this one question and thats due to my Profulix. It says density So what should 50 mS convert to ? That is the whole point of my rants lol

 

[Randy Holmes-Farley]

Assuming it is seawater, a conductivity of 50 mS/cm corresponds to about a density of about 1.0216 g/mL.

 

[Boomer]

So what should 50 mS convert to ? That is the whole point of my rants :lol:

The is a calculator, with instructions, for that on your other post