Ammonia (NH3) is a colorless gas, which can easily be dissolved in water. The concentration of ammonia in water is usually 25 %. Ammonium hydroxide (NH4OH) is formed during the liquefaction.
Ammonia is mainly produced via the five step Haber process. Vaisala K-PATENTS® Process Refractometer PR-43-GP measures the concentration of liquid ammonia after dilution. Final concentration of ammonia is typically around 25 % with measurement taken at ambient temperature. The refractometer can be easily calibrated either to read NH3 (ammonia-in-water) or NH4OH (ammonium hydroxide) in water.
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