Honeywell HC900 Reference Manual page 40

Function Blocks
AGA8GS Function Block
Properties Group
PB
Flowing Pressure Use Gauge
Measurement Pressure
Atmospheric
Pressure
Gas Analysis Override
Expanded
Range Error
Local/Remote
Gas
Component
Values
Units U.S
Metric
26
Parameter Index #
HC900 Hybrid Control Designer Function Block Reference Guide
Parameter Description
Defines the Base or
Contract Pressure to
calculate volume flow rate
at contract conditions in the
units selected by the UNITS
configuration parameter.
Sets whether pressure
measurements are absolute
or gauge pressure. If you
are using gauge pressure,
a value of atmospheric
pressure is required in the
pressure units chosen.
Under certain situations,
the gas component values
may exceed the expanded
range recommended by the
AGA 8 Report. Setting this
checkbox will override the
expanded range error so
that a flow rate will be
calculated. It should be
noted that calculated flow
rates for conditions where
the expanded range is
exceeded are outside of the
recommended uncertainty
values for AGA 8
calculations.
If using this setting, the gas
component parameter pins
are always visible
whether or not this is
selected. Unused pins
can be left floating, since
an unconnected pin is
always read as 0.
Note
that the analyzer values
must be normalized to
ensure the gas component
sum is equal to 1.0.
Type of units for all block
inputs, outputs, and
configuration parameters:
This selection must agree
with the UNITS selection in
the meter block. If they
don't agree, no error will be
indicated on the error/calc
status pins. The Meter
block will detect the error,
and will alert the user.
Value or Selection
psia for U.S Units
bar for Metric Units
Click on Radio Button to select.
Ensure that units and gauge
pressure settings are
consistent with the meter
block.
Enter an Atmospheric pressure
value in units selected by the
UNITS configuration parameter
Check this box to Override the
expanded Range Error.
Expanded Range Override only
required if entered gas values
cause expanded range errors.
Check this box if using an online
analyzer.
Click Radio Button to select.
Ensure that units and gauge
pressure settings are
consistent with the meter
block.
Revision 11
2/07