Aalborg DPM Series, Руководство по эксплуатации

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The following settings are available for the Flow Alarm (see Figure 13 ):
a) Flow Alarm Mode (Tabular entry)
This function determines whether the Flow Alarm is Enabled or Disabled, the only two
selections available. The default entry is Disabled. Alarm Mode selections can be set with
the joystick
UP and DN buttons, and are accepted by pressing the joystick equivalent of the
ENT button.
b) Low Flow Alarm (Numerical entry)
The limit of the required Low Flow Alarm value can be entered in increments of 0.1%, from 0
to 109.9% FS (Full Scale).
If a Low Alarm occurs, and SSR output is assigned to the Low Flow Alarm Event (see Section
6.4.13.5), the SSR output will be activated when the flow falls below the Low Flow Alarm
value.
The Low Flow Alarm condition is also indicated on the corresponding Process Information
screen by alternating every second between units of measure and the alert “Lo!” (meaning
Low).
c) High Flow Alarm (Numerical entry)
The limit of the required High Flow Alarm value can be entered in increments of 0.1%, from 0
to 110% FS (Full Scale). If a High Alarm occurs, and the SSR output is assigned to the High
Flow Alarm Event (see Section 6.4.
5), the SSR output will be activated when the flow
reading exceeds the High Flow Alarm value.
The High Flow Alarm condition is also indicated on the corresponding Process Information
screen by alternating every second between units of measure and the alert “Hi!” (meaning
High).
d) Flow Alarm Action Delay (Numerical entry)
The Flow Alarm Action Delay is a time period in seconds that the Flow Rate value may remain
above the High limit or below the Low limit before an Alarm condition is activated. Valid
settings are in the range of 0 to 3600 seconds. The default value is 0: no delay.
NOTE: The value of the High Flow Alarm must be greater than the value
of the Low Flow Alarm.
NOTE: The value of the Low Flow Alarm must be less than the value of
the High Flow Alarm.