Question 202Electricity & Electronics - Assistant Engineer

The correct answer is C) a salinity cell that senses the electrical conductivity of water. Salinity indicators used in marine applications, such as potable water systems and boiler feed/condensate systems, typically measure the electrical conductivity of the water. This is because the electrical conductivity of water increases as the salt content (salinity) increases. By measuring the electrical conductivity, the salinity of the water can be determined. This relationship between salinity and electrical conductivity is the underlying principle behind the operation of these salinity indicator systems. The other answer choices are incorrect because they do not accurately represent the technology used in common salinity indicator systems. Specifically, these systems do not rely on pH, brine density, or optical refraction to measure salinity.