C1300
Advanced circular chart recorder
3 Configuration
IM/C1300 Rev. J
31
3.6 Alarms Configuration
Overview.
Four alarms per channel
– identified A1 to D1 (for channel 1) up to A4 to D4 (for channel 4).
High/Low process alarms
.
Fast/Slow rate alarms
.
Adjustable hysteresis value
– prevents oscillation of alarm state.
Time hysteresis
– enables delayed triggering of alarms.
Fig. 3.1 High and Low Process Alarm with Hysteresis
Fig. 3.2 Time Hysteresis Alarm
High Process
Low Process
Process
Variable
Hysteresis
Hysteresis
Trip Point
Alarm On
Alarm Off
Alarm On
Alarm Off
Output
Alarm Trip Point
Alarm On
Alarm Off
Time in seconds
Counter
Started
Counter
Reset
Counter
Started
Hysteresis Time
Elapsed
Counter
Reset
40
0
0
70
130
Time Hysteresis Status
Example shows time hysteresis set to 70 seconds used with a high process alarm