Emerson Rosemount TCL, Manual

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High Alarm Logic Figure 7-1:
The alarm activates when the chlorine concentration exceeds the high setpoint. The
alarm remains activated until the reading drops below the value determined by the
deadband.
Low Alarm Logic Figure 7-2:
The alarm activates when the chlorine concentration drops below the low setpoint.
The alarm remains activated until the reading increases above the value
determined by the deadband.
Interval timer Any alarm relay can be used as an interval timer. Figure 7-3 shows how
the timer operates. While the interval timer is operating, the main
display, analog outputs, and assigned alarms for the sensor can be put
on hold. During hold, the main display remains at the last value.
Programming the transmitter
Instruction Manual 47