Functional Description
Flow Computer Tasks
10-4 AutoPILOT PRO Flow Computer User Guide
Thermo Fisher Scientific
The unit keeps historical logs for all meter run data as well as audit/alarm
(event) logs for each meter run configured. For each meter run, the system
defaults include:
Hourly logs: storage for 840 hourly records (35 days)
Daily logs: storage for 65 records
Events: storage for the last 500 events
The data stored in these logs is configurable. Table #226 is reserved for DP
flow calculations, and Table #227 is reserved for AGA 7 flow calculations.
The structure for both tables is shown below.
Table 10–1. Structure of historical data log for DP and AGA 7 flow calculations
Field
Type
I
Description
1
Byte
I
History Log Item #1 Index
2
Byte
I
History Log Item #2 Index
3
Byte
I
History Log Item #3 Index
:
:
:
:
:
:
:
:
36
Byte
I
History Log Item #36 Index
History log index definitions for DP flow calculations are listed in the
following table. Items with non-zero indices will be included in the log in
the order specified.
Table 10–2. DP flow calculation history log index definitions
History Log Index
Definition
0
Undefined
1
Pipe Diameter (Snapshot)
2
Orifice Diameter (Snapshot)
3
Atmospheric Pressure (Snapshot)
4
Pressure Base (Snapshot)
5
Temperature Base (Snapshot)
6
Average Differential Pressure
7
Average Static Pressure
8
Average Gas Temperature
9
Flow Status (Snapshot)
10
Accumulated Volume (Current Log Period)
Historical Data
