- Eliminate multiple hand sampling when mixing
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Real time percent concentration measurements of ammonium hydroxide
with no effects from pressure changes or pipe vibration
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Virtually no maintenance costs
Goal
A chemical company needs to have an online measurement while mixing anhydrous ammonia with water. The pressurized ammonia needs to be bubbled into a mixing tank with ultra pure water. A sample stream is constantly pumped from the bottom of the tank to give a real time reading of percent concentration for aqueous ammonia.
 Resolution
The chemical company chose a Dynatrol® Density system to solve their problem. The Dynatrol Density meter has the Temperature vs. Density vs. Percent concentration curves programmed into the Series 2000 Digital Density Converter. The density meter provides 4-20 mA signals to the chemical company’s control room for percent concentration and temperature of the ammonia and water solution. Since the Dynatrol Density meter outputs percent concentration, there was no need to program a complicated set of algorithms into the DCS control system to calculate percent concentration from density.
After months of comparing hand sample measurements to the measurements of the Dynatrol Density meter, the company found that the Dynatrol Density meter correlated directly to the hand measurements. The company now uses the Dynatrol Density system in the control of the mixing process. This eliminates the bi-hourly hand sampling that technicians would have to perform.
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