Configure process measurement
2. Set the
Base Time Unit
to
minutes
(min).
3. Calculate the conversion factor:
a. 1 thousands of standard cubic feet per minute = 1000 cubic feet per minute
b.
Gas Standard Volume Flow Conversion Factor
= 1/1000 = 0.001
4. Set
Gas Standard Volume Flow Conversion Factor
to
0.001
.
5. Set
Gas Standard Volume Flow Label
to
KSCFM
.
6. Set
Gas Standard Volume Total Label
to
KSCF
.
5.4.4
Configure
Gas Standard Volume Flow Cutoff
Display
Not available
ProLink II
ProLink→Configuration→Flow→Std Gas Vol Flow Cutoff
Field Communicator
Configure→Manual Setup→Measurements→Gas Standard Volume→GSV Cutoff
Gas Standard 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
Gas Standard Volume Flow Cutoff
is 0.0. The lower limit is 0.0. There is no upper limit.
Interaction between
Gas Standard Volume Flow Cutoff
and
AO Cutoff
Gas Standard Volume Flow Cutoff
defines the lowest Gas Standard 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
Gas Standard Volume Flow Rate
, the volume flow rate reported via the mA
output is controlled by the higher of the two cutoff values.
Gas Standard Volume Flow Cutoff
affects both gas standard volume flow values reported via outputs and
gas standard volume flow values used in other transmitter behavior (e.g., events defined on gas
standard volume flow).
AO Cutoff
affects only flow values reported via the mA output.
t
Example: Cutoff interaction with
AO Cutoff
lower than
Gas Standard Volume Flow Cutoff
Configuration:
•
mA Output Process Variable
for the primary mA output:
Gas Standard Volume Flow Rate
•
Frequency Output Process Variable
:
Gas Standard Volume Flow Rate
•
AO Cutoff
for the primary mA output: 10 SLPM (standard liters per minute)
•
Gas Standard Volume Flow Cutoff
: 15 SLPM
Result: If the Gas Standard Volume flow rate drops below 15 SLPM, volume flow will be reported as
0, and 0 will be used in all internal processing.
78
Micro Motion 9739 MVD Transmitters
