Multichannel fluid delivery apparatus

PURPOSE: To rearrange important operation functions to a central operation surface and to call data belonging to individual fluids by interconnecting part of a data input circuit to a data region belonging to a selected fluid source and a region belonging to a group of the selected fluid source by selector switches. CONSTITUTION: This apparatus is so embodied that, when the data region of the prescribed fluid source 3 is selected by using one of the selector switches 13, the interconnection between the data input circuit 10 and the data region can make direct access to the set parameter of the selected fluid. For example, the data rate belonging to the prescribed fluid 7 is made directly readable at an operating surface 5 and is made changeable therein as well. The selector switches 13 are pressure switches in the simplest case which afford the response to the extent that the preset fluid is actuated at the operating surface 5 by the contact at the time of operation of user.