Apex Salinity Probe(how to read)

[bsr2430]

Very dumb question, just got a salinity probe. It’s set up. I did follow the processes and calibrated it.
Now how do you read it?
Says it’s reading at 38.9.
How and where do you convert this?
Stupid dumb question for someone to answer!

 

[P-Dub]

I'm sorry, but, what do you want to convert it to? It's reading ppt. Your tank should be at or right around 35.0. You should likely adjust for temperature compensation. Go to configure, advanced, down you will see TC factor, input 2.0, and update.

 

[bsr2430]

thank you for that!

 

[P-Dub]

@bsr2430 Here is some really good info and I would strongly suggest reading it thoroughly to get you set up properly...
https://www.reef2reef.com/threads/a...ex-salinity-calibration-and-tc-factor.718971/

 

[bsr2430]

@bsr2430 Here is some really good info and I would strongly suggest reading it thoroughly to get you set up properly...
https://www.reef2reef.com/threads/a...ex-salinity-calibration-and-tc-factor.718971/

Do you have any idea how this just helped me out!!!!! Thank you so much for this!!!!

learned something..... I need to get a second salinity solution packet.hahah......
Once I get this I can recalibrate the probe and change the TC to 2.
You have no idea how much this helped me out!
I just wish they would’ve set it to 2 from the beginning. But I understand if you didn’t buy the temp probe.
thank you so much again @P-Dub

 

[P-Dub]

Do you have any idea how this just helped me out!!!!! Thank you so much for this!!!!

learned something..... I need to get a second salinity solution packet.hahah......
Once I get this I can recalibrate the probe and change the TC to 2.
You have no idea how much this helped me out!
I just wish they would’ve set it to 2 from the beginning. But I understand if you didn’t buy the temp probe.
thank you so much again @P-Dub

Here to help!

 

[vetteguy53081]

Salinity Conversion Table​

Conversion table for salinity in parts per thousand (ppt) to specific gravity (sg) combined with temperature variation.

Approximate salinity, in parts per thousand, for the hydrometer reading at the indicated temperature.
Temperature	Specific Gravity
Fahrenheit	Celsius	1.020	1.021	1.022	1.023	1.024	1.025	1.026	1.027
74.0	23.3	28.0	29.3	30.6	31.9	33.3	34.6	35.9	37.2
75.0	23.9	28.2	29.5	30.8	32.1	33.5	34.8	36.1	37.4
76.0	24.4	28.4	29.7	31.0	32.3	33.7	35.0	36.3	37.6
77.0	25.0	28.6	29.9	31.2	32.5	33.9	35.2	36.5	37.8
78.0	25.6	28.8	30.1	31.4	32.7	34.1	35.4	36.7	38.0
79.0	26.1	29.0	30.3	31.6	32.9	34.3	35.6	36.9	38.2
80.0	26.7	29.2	30.5	31.8	33.2	34.5	35.8	37.1	38.5
81.0	27.2	29.4	30.7	32.0	33.4	34.7	36.0	37.4	38.7
82.0	27.8	29.6	30.9	32.3	33.6	34.9	36.3	37.6	38.9
83.0	28.3	29.8	31.2	32.5	33.8	35.2	36.5	37.8	39.2
84.0	28.9	30.1	31.4	32.7	34.1	35.4	36.7	38.1	39.4
85.0	29.4	30.3	31.6	33.0	34.3	35.6	36.9	38.3	39.6
86.0	30.0	30.5	31.8	33.2	34.5	35.8	37.2	38.5	39.8
87.0	30.6	30.8	32.1	33.4	34.8	36.1	37.4	38.8	40.1

 

[vetteguy53081]

Some electronic probes has automatic temperature correct, if this is the case the display will show the conductivity at 77°F (25°C).
...
Salinity unit calculator.

Salinity	at 26°C	at 25°C
Salinity PSU	34.2 (≈ 34.2 ppt)	34.2 (≈ 34.2 ppt)
Density	1.0224 g/cm 3	1.0227 g/cm 3
Specific gravity	1.0257	1.0258

 

[Randy Holmes-Farley Verified Community Expert]

Salinity Conversion Table​

Conversion table for salinity in parts per thousand (ppt) to specific gravity (sg) combined with temperature variation.

Approximate salinity, in parts per thousand, for the hydrometer reading at the indicated temperature.
Temperature	Specific Gravity
Fahrenheit	Celsius	1.020	1.021	1.022	1.023	1.024	1.025	1.026	1.027
74.0	23.3	28.0	29.3	30.6	31.9	33.3	34.6	35.9	37.2
75.0	23.9	28.2	29.5	30.8	32.1	33.5	34.8	36.1	37.4
76.0	24.4	28.4	29.7	31.0	32.3	33.7	35.0	36.3	37.6
77.0	25.0	28.6	29.9	31.2	32.5	33.9	35.2	36.5	37.8
78.0	25.6	28.8	30.1	31.4	32.7	34.1	35.4	36.7	38.0
79.0	26.1	29.0	30.3	31.6	32.9	34.3	35.6	36.9	38.2
80.0	26.7	29.2	30.5	31.8	33.2	34.5	35.8	37.1	38.5
81.0	27.2	29.4	30.7	32.0	33.4	34.7	36.0	37.4	38.7
82.0	27.8	29.6	30.9	32.3	33.6	34.9	36.3	37.6	38.9
83.0	28.3	29.8	31.2	32.5	33.8	35.2	36.5	37.8	39.2
84.0	28.9	30.1	31.4	32.7	34.1	35.4	36.7	38.1	39.4
85.0	29.4	30.3	31.6	33.0	34.3	35.6	36.9	38.3	39.6
86.0	30.0	30.5	31.8	33.2	34.5	35.8	37.2	38.5	39.8
87.0	30.6	30.8	32.1	33.4	34.8	36.1	37.4	38.8	40.1

Just so folks understand, that table is not showing that the specific gravity of seawater is changing with temperature like that. it is showing that a hydrometer used to read seawater will (incorrectly) show the specific gravity to be those values at those temperatures.

The real specific gravity (which is the ratio of the density of the seawater to freshwater at the same temperature) hardly changes at all with temperature.

 

[vetteguy53081]

Just so folks understand, that table is not showing that the specific gravity of seawater is changing with temperature like that. it is showing that a hydrometer used to read seawater will (incorrectly) show the specific gravity to be those values at those temperatures.

The real specific gravity (which is the ratio of the density of the seawater to freshwater at the same temperature) hardly changes at all with temperature.

Actually-that is right as temperature impacts ratio