Patent ID: 8130108

Claim:
A gas level display controller constructed to cause a remaining amount of a compressed gas stored in a tank to be displayed on a predetermined display device, the gas level display controller comprising: a mass computation module that calculates a mass of the compressed gas from a pressure of the compressed gas and a temperature of the compressed gas; a reference value setting module that sets a reference value, which is used for display of the remaining amount of the compressed gas on the display device, to a mass of the compressed gas calculated by the mass computation module on an occasion of a stop of gas filling when at least one of the pressure and the temperature of the compressed gas satisfies a preset condition during filling the compressed gas into the tank; and a display control module, on the assumption that the reference value represents a mass of the compressed gas filled into the tank to its full level, makes the remaining amount of the compressed gas displayed on the display device, based on a ratio of the mass of the compressed gas calculated by the mass computation module to the reference value.