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CamCor CT and PRO Series Hardware Manual
Section 8
4. Select “H/L Alarm Type” (see
, No. 2-6-2) from the following options:
–
High Alarm:
Validate only the high alarm.
–
Low Alarm:
Validate only the low alarm.
–
H/L Alarm:
Validate the high alarm and the low alarm.
5. Set the alarm value based on the alarm type selected in Step 5.
–
, No. 2-6-3). If the input exceeds the established value,
the high alarm will be activated.
Note
If “Low Alarm” is selected in Step 5, the high alarm value is not required.
–
, No. 2-6-4). If the input drops below the established
value, the low alarm will be activated.
Note
If “High Alarm” is selected in Step 5, the low alarm value is not required.
–
Set the high/low alarm hysteresis value (see
, No. 2-6-5). This setting determines
the “dead” or “immunity” zone following an alarm. Select a larger value for measurements that fluctuate greatly.
Select a smaller value for rapid recovery from an alarmed condition.
High/Low Alarm Example
•
Status output assignment (Function):
H/L Alarm
•
Active output of status output (Mode):
Off Active
•
H/L alarm value assignment (Assign):
Mass Flow
•
Alarm type selection (H/L Alm. Type):
H/L Alarm
•
High alarm value setting (High Alm. Po.):
900 kg/min
•
Low alarm value setting (Low Alm. Po.):
200 kg/min
•
High/low alarm hysteresis value (H/L Alm. hys):
100 kg/min
900
800
700
600
500
400
300
200
100
0
Open
Short
High alarm
(900)
Hysteresis
of H/L alarm
(100)
Low alarm
(200)
Time
H/L alarm active
H/L alarm active
Low alarm
arises as instant
mass flowrate
falls below low
alarm value
High alarm
arises as instant
mass flowrate
exceeds low
alarm value
Low alarm canceled as
instant mass flow rate
exceeds [low alarm +
H/L alarm hysteresis]
High alarm canceled as
instant mass flow rate
falls below [high alarm
+ H/L alarm hysteresis]
Instant mass flow rate (kg/min)
Status output
}
}
Figure 8.26—High/low alarm graph
Summary of Contents for CamCor CC001
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