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model 2704 controller installation and operation handbook - Soliton

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<strong>2704</strong> Controller Alarm Operation<br />

7.2.5. Deviation B<strong>and</strong><br />

A deviation b<strong>and</strong> alarm monitors the process variable <strong>and</strong> the working setpoint <strong>and</strong><br />

continuously compares the difference against the alarm setpoint. If the difference is either<br />

negative by less than, or positive by greater than the alarm setpoint, the alarm state will be<br />

active.<br />

S<br />

PV<br />

Alarm ON<br />

Alarm OFF<br />

Alarm Setpoint<br />

U<br />

U<br />

Hysteresis<br />

Working<br />

Setpoint<br />

U<br />

S<br />

S<br />

U<br />

Hysteresis<br />

S<br />

Alarm Setpoint<br />

S<br />

Process<br />

Variable<br />

TimeT<br />

Installation <strong>and</strong> Operation H<strong>and</strong>book. Part No HA026502 Issue 1.0 Apr-00 7-5

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