The liquid discharge apparatus discharges liquid from an orifice of a nozzle portion, and comprises: a nozzle-portion heating device which heats the nozzle portion; and a nozzle heating control device which controls a heating timing by the nozzle-portion heating device in accordance with a discharge drive timing for discharging the liquid from the orifice of the nozzle portion. The invention is based on weighting a signal to be supplied to an amplifier while the gain of a power amplifier is in a transition state. The control circuit provides corresponding disconnection control when disconnection from the grid is desired, wherein the regulated power of the inverter is ramped down in controlled fashion until it reaches a lower threshold whereupon contactor opening is initiated. A real time channel block is used for conveying the real time service components between the local real time applications and the radio transceiver, and a non-real time channel block, connected in parallel with said real time channel block, is used for conveying the non-real time service components between the local non-real time applications and the radio transceiver. The measurement from one or more of the two SPO2 is used to control the oxygen concentration delivered to a patient based on a comparison of the measurements from the at least two SPO2 monitors.