History Points; Flowing Minutes - Emerson FloBoss 103 Instruction Manual

FloBoss 103/104 Instruction Manual
Accumulation
Flow Calculations for
Turbine Metering
1.3.2
1-12
energy over the calculation period. The flow and energy are then
accumulated and stored at the top of every hour. At the configured
contract hour, the flow and energy are then stored to the Daily Historical
Log and zeroed for the start of a new day (contract hour).
The turbine flow calculation is in accordance with 1996 AGA Report
No. 7 (1993 API Chapter 21.1). The FloBoss performs 1992 AGA8
compressibility calculations in accordance with AGA Report No. 8
1992 (API Chapter 14.2).
Once every scan period, the FB100 processes the pulse counts,
determines the number of pulse counts since the last reading, and
calculates a rate. Next, the static pressure and auxiliary pressure values
are read. Then the temperature is read and linearizing compensation is
applied to the pressure readings if necessary.
All resultant values are stored in the current value database. The values
are taken from the current value database and used to calculate the
Minute, Hour, and Daily historical values.
Once a minute and once an hour, the values are logged along with other
configured values to the Historical Database. At the configured Contract
Hour, the values are stored to the Daily Historical Log and zeroed for
the start of a new day.

History Points

History is saved to 2 databases: Standard and Extended History. The
number of entries/logs available to Standard and Extended History is
configurable.
The Standard history archives up to 35 points (8 are pre-configured) of
min/max, minute, hourly and daily values. The min/max values are from
today and yesterday; the minute values are from the last 60 minutes; the
hourly values are from the last 35 days; and the daily values are from
the last 35 days.
The Extended History database creates one entry for up to 15 points at a
user-specified interval (see Specifications table). All the points in the
Extended History will be logged at the same interval.
The default setting for Extended history archives 4 points of 10-minute
values (from the last 35 days). 10-minute archiving provides a
monitoring resolution similar to a chart recorder.
The first eight history points are pre-configured for flow metering
history and cannot be changed:
1. Flowing Minutes Today (Accumulate archive type).
2. Differential Pressure for AGA3 (Average) or Accumulated Raw
Pulses for AGA7 (Totalize).
3. Static or Line Pressure (Average).
4. Flowing Temperature (Average).
General Information Revised August-2017