Ph Sal. calibration solutions or readling offsets

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riggeek
Posts: 115
Joined: Wed Sep 12, 2012 8:41 am

Ph Sal. calibration solutions or readling offsets

Post by riggeek »

Where is a good place to get the PH and Sal. calibration solutions. My readings are slight bit off from the test kits, and I was looking for a way to more accurately calibrate them. Other option might be a offset to correct this.

riggeek
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rimai
Posts: 12881
Joined: Fri Mar 18, 2011 6:47 pm

Re: Ph Sal. calibration solutions or readling offsets

Post by rimai »

Get the hanna solutions.
http://www.hannainst.com/usa/
Roberto.
alexwbush
Posts: 327
Joined: Tue Mar 22, 2011 12:45 am
Location: San Diego, CA

Re: Ph Sal. calibration solutions or readling offsets

Post by alexwbush »

I bought mine from bulk reef supply
http://www.bulkreefsupply.com/
riggeek
Posts: 115
Joined: Wed Sep 12, 2012 8:41 am

Re: Ph Sal. calibration solutions or readling offsets

Post by riggeek »

I have done the calibrations.

The PH looks better now. but the salinity is still reading high.

With RO water I get 6, and with the 1.35 calibration solution it get 35. when I putt the probe back in the tank it reads 25.7 but with the hydrometer and refractometer i am more in the range of 22 and ideas here?
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rimai
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Re: Ph Sal. calibration solutions or readling offsets

Post by rimai »

I don't think hydrometers can measure salinity, can they?
Are you looking at specific gravity or salinity?

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Roberto.
riggeek
Posts: 115
Joined: Wed Sep 12, 2012 8:41 am

Re: Ph Sal. calibration solutions or readling offsets

Post by riggeek »

you are right i am used to dealing with SG not salinity. Looking at it that way the number make more sense.

thanks for the help.
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riggeek
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Re: Ph Sal. calibration solutions or readling offsets

Post by riggeek »

I am still have problems with this. I have brought my salt level up. I am now at the following readings

my hydrometer is reading 1.024 SG, the refractiometer is reading 1.025 SG. The tank temp is at 78 Deg F or 25.5 Deg C.

Using these web sites I am showing a salinity of 33 to 35, but the Salinity probe is showing 29.

http://www.lumcon.edu/education/student ... alconv.asp
http://crabbywiki.com/tiki-index.php?pa ... ic+Gravity

Not sure where to go to with this now. Any help would be appreciated.

Thanks
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rimai
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Re: Ph Sal. calibration solutions or readling offsets

Post by rimai »

Is it showing 29 after calibration?
You must calibrate it on 35ppt solution.
If your tank is at 35ppt, you can use your own tank water as calibration solution.
In which case, you can just dip the probe in your sump and go through calibration.
Roberto.
riggeek
Posts: 115
Joined: Wed Sep 12, 2012 8:41 am

Re: Ph Sal. calibration solutions or readling offsets

Post by riggeek »

I re calibrate and got it from there.

Thanks for the assistance

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