Real time control chart generation and monitoring of safety systems

摘要

A safety system may include a monitoring device that receives analog values of various parameters from one or more safety appliances. The analog values may be compared to upper and lower control limits in control charts for the parameters for each safety appliance. When an analog value falls outside of the upper control limit or lower control limit in the control chart, an alert may be issued to indicate that the safety appliance may be degrading or failing. The monitoring device may also generate control charts for safety appliances from the analog values output from the safety appliances.

主权项

1. A method for monitoring a safety appliance, comprising:
receiving an analog value for a parameter from the safety appliance at a monitoring device comprising a processing unit; comparing the analog value to a control chart for the safety appliance at the monitoring device, the control chart including an upper control limit and a lower control limit for the parameter; and issuing an alert when the comparison indicates an alert condition, wherein the alert condition is indicated when: the analog value is larger or smaller than a mean value by a threshold value; the analog value is larger than the upper control limit or smaller than the lower control limit; a number of consecutively received analog values are more than a threshold amount outside of and on the same side of a mean value; or a distance between a number of consecutively received analog values and a mean value is increasing.