Rate-of-Change Alarm. There are times when you want an alarm to alert you to a fast-moving temperature -- for example, to head off a large temperature change or a thermal reaction. In these cases, you would specify a rate-of-change alarm and set it in units of degrees/minute.
Load-Break Alarm. With this feature, the controller watches and times any movement in the process temperature. At the same time, it notes its command to the power output device (a contactor, for example) and looks for a contradiction. The controller will trigger an alarm if: