E-023-2-E
3.6.1 Converter variables (Fld dev var)
①
Click "Setup (S)" in the menu, and then select and click "Fld dev var".
②
The following window will be displayed (Fig. 20).
Fig.20
③
In the "Flow" section, the mass flow unit, volume flow unit, inflow direction, flow damping, flow cutoff,
and volume flow compensation coefficient can be set.
If the "Sensor type" is CB or CS, then the volume flow unit "Vol flow unit" and "Vol flow coef" selection
items will not be displayed.
The flow direction can be set to either "Forward" or "Reverse", whereby "Forward" means the direction
indicated for the flow direction on the flowmeter unit is treated as the "positive direction", and "Reverse"
means the opposite direction from the arrow is treated as the "positive direction". Flow cutoff indicates
a percentage of the maximum allowed flow, with the standard setting at "0.3%". This functions both in
the positive and negative directions.
④
In the "Density" section, the density unit, density damping, gas multiphase flow determination, density
compensation, and settled density can be set.
If the gas multiphase flow determination exceeds the setting value of the measurement density
’
s
"Slug low limit" or "Slug high limit", then this is seen as a gas multiphase flow, and the flowmeter
side
’
s result and output are forcibly set to "0". When "Slug low limit" is set to "0" and "Slug high limit" is
set to "10", the gas multiphase flow determination function is turned "OFF". Also, if it is within the time
set in "Slug duration", then the gas multiphase flow state will be ignored, and ordinary measurements
will be continued.
When density compensation "Compensation" is set to "ON", the density and volume flow become
values that are converted based on the base temperature (calculated with "Standard temp" and
"Expansion coef").
When settled density "Settled dens" is set to "ON", then the value set with "Dens value" is reflected in
the volume flow.