What are the Monitoring Equipments fitted on Cargo tanks of ships?

Cargo tanks can be provided with the following monitoring equipment:

• Gauging equipment which measures the level of product in the tank and provides the information to a remote display;
• One or two high level alarms, working independently of the gauging equipment, which trigger an alarm when the level of cargo in the tank nears the maximum capacity;
• Pressure sensors which measure the pressure above the cargo and provide a warning should pre-set over pressure or under pressure settings be exceeded;
• Temperature monitoring sensors which measure the temperature of the cargo at different levels in the tank and provide the information to a remote display; and
• Gas sensors (which are fitted on some tanks) automatically measure the oxygen content and the concentrations of selected gases within the space and provide the information to a remote display.