Diligent Micro Controls offers Monitor for Solenoid Coil. Diligent Micro Controls offers Electronic Controllers, Electronic Control Systems & Electronic Control Relays for specific industrial applications. Solenoid valves are very critical in the process control and their healthiness is of utmost importance. Diligent Monitor for Solenoid Coil monitors the healthiness of solenoid coil during operation. When coil gets open during operation, a potential-free contact closes to transfer this information to centralized SKADA system or sound an alarm.