An actuator for a valve pin of an injection molding apparatus includes an adjustment piece coupled to a valve pin via a connector and axially movable relative to a piston to adjust an axial position of the valve pin relative to a mold gate. The comparator compares the output voltage with a reference voltage signal and generates a PWM signal. The aperture may then be filled with a dielectric material. The operational amplifier generates an output signal according to the current flowing between the terminals where the output signal is indicative of the amount of target gas in the atmosphere. When a predetermined medical image displayed on the display unit is selected, the indicating unit displays an image indicating a time position on the time chart corresponding to the scan time information included in the medical image. The system includes a meter configured to measure electric energy usage; a memory area for storing an energy usage profile corresponding to one or more electrical devices associated with the electric meter, and at least one processor.