To limit the probability that the operation of the liquid dispenser will lead to the ignition of gases, [released from the nearby gas dispensers], which could lead to a fire or explosion, which could lead to harm to persons.
To limit the probability that the operation of the gas dispensers will lead to the ignition of vapour [released from the nearby liquid dispensers], which could lead to a fire or explosion, which could lead to harm to persons.
To limit the probability that misuse of, or confusion in the operation of, the liquid dispenser will lead to the escape of liquid, which could lead to the ignition of vapour from a nearby ignition source, which could lead to harm to persons.