There is provided a system, apparatus and method for monitoring a status of a gas supply, the gas supply including at least two gas containers (120). A valve (150) is in fluid communication with the gas containers (120), the valve (150) is adapted to change over the supply of gas from one gas container (120) to another gas container (120). A sensor arrangement (420) located externally of the gas containers (120), and the sensor arrangement (420) senses a property relating to the gas supply and generates a sensor signal representative of the property. A controller (200) receives the sensor signal and is configured to generate a status alert signal. The controller (200) is further configured to transmit the status alert signal to a user device (180) via a server (300).