The HYDAC VR 2 D.1 /L24 is a combined visual and electrical clogging indicator designed to monitor the contamination level of filter elements in hydraulic and lubrication systems. It operates based on differential pressure, activating when the pressure drop across the filter exceeds a predefined limit. This model provides a dual alert system: a red mechanical pop-up pin for immediate on-site visual inspection, and an electrical switch contact that can be integrated into a control system for remote alerts. The integrated 24V LED (L24 designation) offers an additional, highly visible warning, ensuring that filter maintenance is performed in a timely manner to prevent system damage and maintain peak performance.