Monitoring a health status of a solenoid

A computer-implemented method for estimating a health state of a solenoid valve comprising a solenoid for supporting a process control system, the method comprising the steps of:

• monitoring a current passing through the solenoid;
• determining a time period between an instant of initiating a state change of the solenoid valve and an instant when the time derivative of the current is discontinued;
• comparing the time period with a reference time period indicative for the health state of the solenoid valve thereby determining the health state;
• wherein,
• the method further comprising the step of:
• sampling the monitored current by obtaining an array of sampled currents, and wherein the determining and the comparing steps are performed on the array of sampled currents, and the determining step is further performed by sequentially correlating a subarray of the array of sampled currents with a reference subarray representing a V-shaped or L-shaped function.