56
Reference Manual
00809-0100-4772, Rev FA
March 2016
4.2.5
Error conditions
4.3
Flow units
The flow units are configured in the AI block. If Standard or Normal flow units are selected,
the density ratio must be entered in the transducer block in order for the conversion to take
place. If mass units are selected, the process density must be entered.
4.3.1
Standard/normal flow units
The flowmeter allows you to measure standard or normal flow units (SCFM, SCFH, NCMM,
NCMH, NCMD). Configure the software in one of two ways:
1.
Enter the density ratio to convert from actual flow rate to standard flow rate.
2.
Enter the process and base conditions. (The flowmeter electronics will then
calculate the density ratio for you.)
See Density Ratio and Process and Base Conditions below for definitions.
Note
Be careful to calculate and enter the correct conversion factor. Standard flow is calculated
with the conversion factor you enter. Any error in the factor entered will result in an error in
the standard flow measurement. If pressure and temperature change over time, use actual
volumetric flow units. The flowmeter does not compensate for changing temperature and
pressure.
Symptom
Possible
causes
Corrective action
Mode will not leave out of
service (OOS)
Target mode
not set
Set target mode to something other than OOS.
Resource block
The actual mode of the resource block is OOS.
See
for corrective action.
PV or SV is BAD.
Measurement
See
Flow is above SENSOR_RANGE.EU100.
PV or SV is UNCERTAIN.
Measurement
Flow is above PRIMARY_VALUE_RANGE.EU100
or flow is being simulated in the transducer
block.
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