Two experiments were conducted to determine how much sodium in food could be detected using a salinity meter. First, the salinity of mixed solutions of 0 to 6% sugar, 0 to 5% oil, and 0 to 6.4% MSG in a 1% NaCl solution was measured using a salinity meter and a Mohr titration method, and the results were compared with the calculated sodium expectations. As a result, the sodium contents of the sugar solutions and MSG solutions measured using a salinity meter were lower than the expected concentrations at 2% or more and 0.8% or more, respectively (p<0.05). The salinity of the 18 HMR products was measured in the same way, and the results were then compared with the sodium contents of the nutrition facts. The average sodium content of all products measured using the salinity meter and Mohr method was 1.12 times and 1.06 times the sodium content of the nutrition facts, respectively. On the other hand, the differences between the products were significant. The correlation coefficients between the nutrition facts and salinity meter, the nutrition facts and the Mohr method, and the salinity meter and Mohr method were 0.885, 0.920, and 0.950, respectively (p<0.01).

A fresh water generator is designed to produce fresh water from sea water. This generator produces fresh water by evaporating and condensing sea water, and it uses the engine jacket water as the heat source. While a vessel is sailing, it uses main engine coolant to produce fresh water and also, while a vessel is in port, it uses auxiliary engine coolant. After all, sea water is evaporated the heat which the coolant contains, so it can produce fresh water economically, because it dose not need additional heat source. A salinity meter is a densitometer measuring the concentration of salt in sea water. This study designed the multi-function salinity meter(SAL-2000). SAL-2000 has many functions such as conductivity, salinity, flow rate, and so on. In order to evaluate the performance of SAL-2000, the measuring experiments such as salinity, flow rate, and pressure have been conducted.