Which instrument is used to determine when a tank has been adequately filled?

The fixed maximum liquid level gauge is specifically designed for the purpose of determining when a tank has been adequately filled with liquid propane gas (LP-gas). This instrument is installed at a predetermined level within the tank and serves as a reliable indicator that the liquid reached this level, signaling that the filling process should stop to prevent overfilling.

The importance of having a fixed maximum liquid level gauge lies in safety and compliance with regulations. Overfilling a tank can create hazardous conditions and increase the risk of leaks or other safety issues. By utilizing this gauge, operators can ensure that they are filling the tank to the appropriate level without exceeding safe limits.

Other instruments, such as pressure gauges, flow meters, and temperature sensors, provide valuable data during the filling process but do not specifically indicate the fill level in relation to the tank's capacity. They serve different functions: pressure gauges monitor the pressure within the tank, flow meters measure the amount of liquid being added, and temperature sensors help assess changes in temperature, which can affect gas density and pressure. However, none of these instruments provide a direct measurement of the tank's fill level in the way a fixed maximum liquid level gauge does.