Microdosing device and method for dispensing droplets from a plurality of nozzles

A method for dispensing droplets from a plurality of nozzles of a microdosing device, wherein the microdosing device comprises a cartridge, in which at least a part of a dosing chamber and the plurality of nozzles are formed, wherein the dosing chamber is fluidically connected to a fluid inlet and the plurality of nozzles, an actuator, a pressure control device provided separately from the actuator, a pressure sensor and a liquid reservoir fluidically connected to the fluid inlet, the method comprising

• generating, by means of the pressure sensor, a pressure signal dependent on a pressure in the dosing chamber;
• controlling, by means of the pressure control device, a pressure in the liquid reservoir on the basis of the pressure signal;
• and
• changing, by means of the actuator, a volume of the dosing chamber to thereby eject a droplet from each of the plurality of nozzles.

A microdosing device for dispensing droplets from a nozzle, comprising

• a cartridge, in which at least a part of a dosing chamber and the nozzle are formed, wherein the dosing chamber is fluidically connected to a fluid inlet and the nozzle;
• an actuator which is configured to change a volume of the dosing chamber to thereby eject a droplet from the nozzle;
• a liquid reservoir which is fluidically connected to the fluid inlet by means of a first fluid conduit;
• a second fluid conduit, wherein a first end of the second fluid conduit is fluidically connected to the fluid outlet of the dosing chamber and a second end of the second fluid conduit is an outlet, wherein a first valve is arranged between the first end and the second end which, when closed, shuts off a flow in the second fluid conduit, wherein, when the first valve is closed, a volume fluidically coupled to the dosing chamber and otherwise closed is formed, and wherein the microdosing device comprises a pressure sensor which is arranged to detect a pressure in the closed volume and to generate a pressure signal dependent on a pressure in the dosing chamber;
• a pressure control device provided separately from the actuator which is configured to control a pressure in the liquid reservoir on the basis of the pressure signal.