When the viscosity exceeds the set-point by a predetermined amount, the controller activates a solenoid valve to permit additional solvent to enter the paint recirculation supply tank. After a sufficient time delay to allow for thorough mixing, the controller may signal for further solvent addition if the set-point viscosity has not been reached. The controller gives a visual signal when adding solvent. The paint recirculating line has a primary heater in the main line and a secondary heater near the spray gun. These heaters are designed to regulate the paint temperature.
Sensors send paint temperatures to a central computer, which is tied to the digital controller.
Each paint recirculation supply tank has its own Norcross M8B viscosity measuring element.