-
The gas flow computer run-time software that resides in the
IPm Controller or RTU, configurable for up to five runs performing
the same type of calculation.
- The gas
flow computer configuration software integrated with the SIXNET
I/O Tool Kit plus complete on-line documentation
 The
gas density input required for the AGA calculations can be provided
by AGA-8 or other supported gas density calculations or by an
external density transmitter connected to an analog input channel.
The AGA-8 and other supported algorithms are implemented as
part of the run-time software in the IPm.
The gas
composition data required by the AGA-8 or other supported gas
density energy calculations is entered by means of the configuration
software. Or the run-time software can be configured to obtain
the gas composition data directly from an external gas chromatograph
connected to the IPm. The communications between the IPm and
the optional external gas chromatograph is via the Modbus protocol.
Datalogging
of flow calculation results, averages, user changes and events
is provided and meets API 21.1 requirements (35 days of hourly
and daily averages, 700 user changes and events, as well as 300
process alarms). In addition, flexible datalogging may be configured
with the standard IPm Sixlog capabilities.
All input
measured data required for calculations, as well as calculations
results are available through the IPm I/O database. This means
that flow computer data can be referenced by all other applications
in the IPm, including ISaGRAF IEC 61131 Programming, Sixlog Datalogging,
I/O Transfers, Modbus / HART / DNP3 protocol drivers, and third
party add-on applications.
The configuration
software that’s integrated with the SIXNET I/O Tool Kit
allows you to configure the run-time Flow calculations behavior.
Among the configurable parameters, you can enter and configure
the following:
- Gas properties
(composition, heating value and density)
- Primary
flow element type (Turbine Meter, Orifice Plate or Accelabar
pitot tube)
- Primary
flow element parameters (Pipe internal diameter and orifice
size, turbine meter output frequency calibration value and
pitot tube characteristics)
- Gas flow
calculation algorithms to use (AGA3, AGA-7, Accelabar or SY/T6143)
- Gas density
calculation algorithms to use (AGA-8,
SGERG-88 or ISO 12213-2, -3)
- Gas density
source (Manual as entered in the configuration software, Calculated
by AGA-8,
SGERG-88, ISO 12213-2, -3
or Measured from an external densitometer connected to the
IPm)
- Gas Composition
source (Manual as entered in the configuration software or
Measured from an external gas composition analyzer connected
to the IPm)
- Alarms,
events and configuration change logging parameters for audit
trail.
- Measured
input variables and calculation result locations within the
IPm I/O database (I/O mapping)
- Engineering
units (Imperial or SI)
|
AGA-3
(orifice plate)
