Configure process measurement
5.3.3
Configure
Volume Flow Cutoff
Display
Not available
ProLink II
ProLink→Configuration→Flow→Vol Flow Cutoff
Field Communicator
Configure→Manual Setup→Measurements→Flow→Volume Flow Cutoff
Volume Flow Cutoff
specifies the lowest volume flow rate that will reported as measured. All volume
flow rates below this cutoff will be reported as 0.
Procedure
Set
Volume Flow Cutoff
to the desired value.
The default value for
Volume Flow Cutoff
is 0.0 L/s. The lower limit is 0. The upper limit is the sensor’s flow
calibration factor, in units of L/s, multiplied by 0.2.
Interaction between
Volume Flow Cutoff
and
AO Cutoff
Volume Flow Cutoff
defines the lowest liquid volume flow value that the transmitter will report as measured.
AO Cutoff
defines the lowest flow rate that will be reported via the mA output. If
mA Output Process Variable
is
set to
Volume Flow Rate
, the volume flow rate reported via the mA output is controlled by the higher of
the two cutoff values.
Volume Flow Cutoff
affects both volume flow values reported via outputs and volume flow values used in
other transmitter behavior (e.g., events defined on volume flow).
AO Cutoff
affects only flow values reported via the mA output.
t
Example: Cutoff interaction with
AO Cutoff
lower than
Volume Flow Cutoff
Configuration:
•
mA Output Process Variable
for the primary mA output:
Volume Flow Rate
•
Frequency Output Process Variable
:
Volume Flow Rate
•
AO Cutoff
for the primary mA output:
10
liters/second
•
Volume Flow Cutoff
:
15
liters/second
Result: If the mass flow rate drops below 15 liters/second, volume flow will be reported as 0 , and 0
will be used in all internal processing.
t
Example: Cutoff interaction with
AO Cutoff
higher than
Volume Flow Cutoff
Configuration:
•
mA Output Process Variable
for the primary mA output:
Volume Flow Rate
•
Frequency Output Process Variable
:
Volume Flow Rate
•
AO Cutoff
for the primary mA output:
15
liters/second
•
Volume Flow Cutoff
:
10
liters/second
Configuration and Use Manual
73
