Monitoring method and application device for a multi-component viscous material

A method for monitoring an apparatus (10) for application of an at least two-component viscous material onto workpieces, the method comprising:

• providing the apparatus, wherein the apparatus has a metering unit (12) having a number of metering valves (18) that corresponds to the number of components of the viscous material, as well as a static mixer (14) for blending the components, detachably attached to the metering unit (12), wherein the static mixer (14) has a material inlet (30) that faces the metering unit (12) and a material outlet (32) that faces away from the metering unit (12), and wherein each metering valve (18) has a supply channel (48) that can be closed off at a valve seat (22), for supplying the corresponding component to the static mixer (14),
• carrying out a number of material applications, one after the other, wherein the applications have an identical, predetermined time progression between an application start (52) and an application end (62), in each instance,
• measuring, during the material applications, the pressure in at least one of the supply channels (48), using a pressure sensor (50), at predetermined time points between the application start (52) and the application end (62).