Provided is a method for bonding glass members for optical communication, which can achieve sufficient bonding strength and resistance to separation between the glass member and the adhesive layer. And, the magnitude of this voltage Vset is then changed depending on the ambient temperature so that the magnitude of the voltage Vset is small as the temperature becomes high. The system and method are further configured to generate a user interface having a user-selectable or user-inputtable order field for allowing the second user to order the beverage. The external sampling valve has a first configuration and a second configuration useful in three steps of drawing, loading and discharging sample.