Pinpoint salinity meter vs refractometer
- Thread starter rishma
- Start date
I like conductivity probes as well. I discuss the method behind them here:
Using Conductivity to Measure Salinity
http://web.archive.org/web/20040604...iumfish.com/aquariumfish/detail.aspx?aid=1804
They can also be used for things refractometers cannot easily be used for, such as limewater potency and skimmate salinity.
Using Conductivity to Measure Salinity
http://web.archive.org/web/20040604...iumfish.com/aquariumfish/detail.aspx?aid=1804
They can also be used for things refractometers cannot easily be used for, such as limewater potency and skimmate salinity.
Great guys, thank you! I just calibrated for the first time after 2 years and it was 0.5 ppm off....not bad.
Randy, thanks. I now remember reading that article. I forgot about the limewater potency. very cool.
I am an apprentice reef chemist according to the 2007 quiz. I guess I need to hang around this forum more.
Cheers
Randy, thanks. I now remember reading that article. I forgot about the limewater potency. very cool.
I am an apprentice reef chemist according to the 2007 quiz. I guess I need to hang around this forum more.
Cheers
Billybeau1
Premium Member
ex·plic·it (k-splst)
adj.
1.
a. Fully and clearly expressed; leaving nothing implied.
b. Fully and clearly defined or formulated: "generalizations that are powerful, precise, and explicit" Frederick Turner.
2. Forthright and unreserved in expression: They were explicit in their criticism.
3.
a. Readily observable: an explicit sign of trouble.
b. Describing or portraying nudity or sexual activity in graphic detail.
I would say Randy's articles fall under that category. :lol:
adj.
1.
a. Fully and clearly expressed; leaving nothing implied.
b. Fully and clearly defined or formulated: "generalizations that are powerful, precise, and explicit" Frederick Turner.
2. Forthright and unreserved in expression: They were explicit in their criticism.
3.
a. Readily observable: an explicit sign of trouble.
b. Describing or portraying nudity or sexual activity in graphic detail.
I would say Randy's articles fall under that category. :lol:
It is just a matter of the conductivity range covered by each. The Pinpoint conductivity meter reads very low levels, for RO/DI issues. The salinity meter reads higher levels, for seawater salinity and limewater potency. 
FWIW, I have a more expensive device that covers the whole range in a single meter.
hahaha... I am at work and tried to open the link to that article. I was blocked and got a warning about trying access explicit material.
The original site is down so I used a web archive link. Maybe that was too explicit.
"a. Fully and clearly expressed; leaving nothing implied."
Hey, nice description.
FWIW, I have a more expensive device that covers the whole range in a single meter.
hahaha... I am at work and tried to open the link to that article. I was blocked and got a warning about trying access explicit material.
The original site is down so I used a web archive link. Maybe that was too explicit.
"a. Fully and clearly expressed; leaving nothing implied."
Hey, nice description.
Try measuring it away from your lights. Some meters suffer from electrical interference.
How much do you see the values vary after waiting a few minutes for temperature equilibration?
How much do you see the values vary after waiting a few minutes for temperature equilibration?
Yes, I too have noticed that the temperature correction takes longer than my more expensive probes.
austinaqualung
New member
Does anyone have any recommendations of meters that cover the whole conductivity range?
I use an Orion model 128. It is no longer sold new, and Thermo took them over. They still make great units, but are very expensive if new. Maybe you could find a used one somewhere.
There are others that you can find from suppliers such as Cole Parmer.
http://www.coleparmer.com/catalog/product_index.asp?cls=555&Mode=7
There are others that you can find from suppliers such as Cole Parmer.
http://www.coleparmer.com/catalog/product_index.asp?cls=555&Mode=7
This is the one I have ben recommending form Cole-Parmer
Oakton ® Acorn TM CON 6 Conductivity Meter
http://www.coleparmer.com/catalog/product_view.asp?sku=3560610
Oakton ® Acorn TM CON 6 Conductivity Meter
http://www.coleparmer.com/catalog/product_view.asp?sku=3560610
This is the one I have been recommending from Cole-Parmer
Oakton ® Acorn TM CON 6 Conductivity Meter
http://www.coleparmer.com/catalog/product_view.asp?sku=3560610
Oakton ® Acorn TM CON 6 Conductivity Meter
http://www.coleparmer.com/catalog/product_view.asp?sku=3560610
So they are both conductivity meters.
And according to this off of American Marine's site...
"Note: The 2K scale will display up to 2,000 microSiemens (µS) in a resolution of single microSiemen units (µS). This is most useful for freshwater applications. The 20K scale will display up to 20,000 microSiemen (µS). When the meter is used in the 20K mode, only the first four digits will be displayed, i.e. 15.41 is actually 15,410 microSiemens (µS). Samples in excess of 20,000 microSiemens will appear on the display as "1" signifying that the sample is of out of range of this instrument. The PINPOINT Salinity Monitor can be used to measure this higher range up to 200,000 µS."
The Salinity Monitor would be the better of the two in SW applications.
Anybody else have experiences with either?
Yes, they are both conductivity meters with different ranges. I've used the salinity meter and it is fine for tank salinity.
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