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NOTE: Use Low Flow Alarm to monitor conditions when actual fl ow rate falling
below the set point value.
The following settings are available for the Flow Alarm (see Figure 19):
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 110.0% FS (Full Scale).
If a Low Alarm occurs, and SSR output is assigned to the Low Flow Alarm Event (see
Section 6.4.15.6), the SSR output will be activated when the absolute value of the
difference between fl ow rate and set point value equal or more than the Low Flow
Alarm value and fl ow rate is lower than set point 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 fl ow).
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 6.4.15.6), the SSR output will be activated
when the absolute value of the difference between fl ow rate and set point value equal
or more than the High Flow Alarm value and fl ow rate is higher than set point 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 fl ow).
NOTE: Use High Flow Alarm to monitor conditions when actual fl ow rate rising
above the set point value.
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.
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