Refractometer for Testing Percent NaCl, Sodium Hydroxide, Hydrochloric Acid, and Sodium Sulfite.

Very interested, yet ignorant about this technology. I need reliability in testing % NaCl in water softening applications as well as concentrations of sodium hydroxide, hydrochloric acid, and sodium sulfite. Do I need multiple instruments? Can I get the meter to read in ppm of sodium sulfite? Can the meter(s) read in % saturation of NaCl? I am used to reading hydrometers for all but sodium sulfite, can the instruments give the same read out in % acid or caustic? I really do not understand the BRIX scale and how that will look when all I want is the strength of acid or % saturation of NaCl. Thanks,

There are many scales available for the Palm Abbe digital refractometer. In general, refractometers are very good at measuring binary (two-part) fluids, such as sodium chloride (NaCl) and water. Where the sodium chloride is the variable and water is the constant. For these types of binary fluids, the resolution (detection threshold) is typically in parts per thousand (ppt). Measurements of concentrations in the parts per million rage is not possible with a handheld refractometer.

As long as you can accept measurements in the parts per thousand, percent saturation, or concentration, then a refractometer would be useful for you. We have scales available for directly measuring sodium chloride (NaCl), sodium hydroxide (NaOH), hydrochloric acid (HCL), and sodium sulfate (Na2SO4), provided that your fluid is just one of those chemicals and water. If there are more than two parts to the solution, a refractometer could not discriminate which part was causing a change in the overall refractive index.

The Brix scale is a measure of the percent of sucrose in a sucrose/water solution. This scale would not be of any use to you unless you have a conversion table.

Check out our Build Your Own Page and put together scales that make sense for your full application.

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