Process parameter name Identifying name given to the parameter. A process parameter defines the amount of time needed for the safety provision to go into action after a problem is detected. It includes a “calamity value” to determine whether the process will take place in time to avoid the most unfavorable scenario. See Also Response time unit of measure Unit of measure used for the response and correction time. See Also Process unit of measure Unit of measure used for the detection process, for example, lbs per sq. inch or degrees of temperature. See Also Detection device Equipment used to determine the problem. See Also Time until consequences The amount of time from the event that caused the problem until the consequences occur. See Also Set point The value at which the safety system is initiated (for example, the temperature or pressure at which a problem is detected). See Also Response time Amount of time it takes for the detection device to determine that the set point has been reached (for example, the amount of time it takes for the pressure gauge to detect that pressure has reached the high point). See Also Correction time Amount of time needed to take correction action (for example, the time it takes the pressure relief valve to open). See Also Process rate of change The rate at which the process value changes expressed in terms of the response time unit of measure (for example, 1.000 lbs per sq. inch/second). See Also Low margin percentage Percentage of the set point used to calculate the low margin of error for the detection device. The percentage is subtracted from the set point value to arrive at the low margin. See Also Low margin Low margin of error for the detection device, shown in the unit of measure for the process. See Also High margin percentage Percentage of the set point used to calculate the high margin of error for the detection device. The percentage is added to the set point value to arrive at the high margin. See Also High margin High margin of error for the detection device, shown in the unit of measure for the process. See Also Calamity value The process value at which the most unfavorable scenario occurs. See Also
