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Operation and Maintenance Manual for

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Time Delays Time delays <strong>and</strong> deadb<strong>and</strong>s are used to control the action of the MC10 alarms.<br />

These are described below.<br />

Process Value<br />

Time<br />

Delay<br />

Time<br />

Alarm is Released When Rising Process Value<br />

Exceeds Setpoint Plus Deadb<strong>and</strong><br />

Deadb<strong>and</strong><br />

Low Alarm Setpoint<br />

Alarm Activates at End of Time Delay<br />

The illustration above shows the action of a low alarm setpoint on a falling value.<br />

The high setpoint works in the same manner except the deadb<strong>and</strong> is below the<br />

setpoint.<br />

Process Value<br />

Time<br />

Delay<br />

Time<br />

Alarm Activates at End of Time Delay<br />

High Alarm Setpoint<br />

Deadb<strong>and</strong><br />

3-7<br />

Alarm is Released When Rising Process Value<br />

Drops Below Setpoint Minus Deadb<strong>and</strong>

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