ATC Refractometer

[bruiser22]

Just bought one. The instructions were all in Chinese and the calibration liquid was in a plain white bottle. I bought a bottle of aqua care calibration liquid.

It says to calibrate to 35ppt. My lens has two measurements. the left side, which is the gravity, says
d 20/20 and the other is o/oo. Which side to I calibrate to what? My assumption is the right side to 35.

Thanks

 

[ReeferBob]

Not sure what you are looking at but you need to turn the screw until it is on the 35ppt line exactly. Rer-check often to see how much it drifts. At least monthly.

 

[redfishbluefish]

The "d" side is the specific gravity reading, while the "0/00" side is the reading in ppt (parts per thousand). You can use either side, whatever you feel comfortable is reporting.....for the calibration solution, 1.026 SG, and for the PPT side, 35.


HERE is an English manual, with one correction needed.....do not use RO/DI water to calibrate, use the 53mS calibration solution (which is also 35ppt or 1.026 SG).

Hope this helps.

 

[seastar]

The "d" side is the specific gravity reading, while the "0/00" side is the reading in ppt (parts per thousand). You can use either side, whatever you feel comfortable is reporting.....for the calibration solution, 1.026 SG, and for the PPT side, 35.


HERE is an English manual, with one correction needed.....do not use RO/DI water to calibrate, use the 53mS calibration solution (which is also 35ppt or 1.026 SG).

Hope this helps.

Couldn't have said it better myself. My calibration fluid says to wait 45 seconds on an ATC refractometer to take a reading as well. I test weekly and I reset the refractometer because I find it seems to drift a bit.

 

[morpheas]

use the 53mS calibration solution (which is also 35ppt or 1.026 SG).

One correction. The conductivity solutions are not necessarily the same as the salinity solutions. As @Randy Holmes-Farley points here for it to work both ways it would have to be a seawater type solution (which for instance the Neptune one is not). Just to clarify and make sure there is no confusion.

PS: Just noticed that you probably mean the one specifically he bought which would be fine. But in general it's a good idea to keep in mind that conductivity and refraction is not the same. I almost fell for this myself when trying to calibrate the PM2 and a refractometer at the same time.