What instrument is utilized to measure the amount of oil in water that is discharged overboard?

The instrument used to measure the amount of oil in water that is discharged overboard is the oil content monitor. This device is specifically designed to continuously monitor the level of oil contamination in water, particularly in marine applications, ensuring compliance with environmental regulations. It typically utilizes sensors and optical techniques to detect the presence and concentration of oil in the water, allowing operators to make informed decisions about discharge practices.

Other instruments listed serve different purposes. An oil quality analyzer focuses on assessing the properties or quality of oil itself, not the concentration in water. A water purity meter is used to measure the overall purity of water, which may not specifically indicate oil content. A discharge analyzer could refer to a broader array of instruments that assess various aspects of discharged materials, but without the specific focus on oil contamination present in an oil content monitor. The dedicated functionality of the oil content monitor makes it the appropriate choice for monitoring oil levels in discharged water.