Instruction manual

ControlWave Gas Flow Computer (GFC Plus) Instruction Manual (CI-ControlWave GFC Plus)
Revised Feb-2013 Introduction 1-13
gas day starts at some time other than midnight. The daily log holds 62
entries; this ensures that the previous calendar month of daily data is
always resident in flash memory.
The daily data log stores the following items:
 corrected volume
 uncorrected volume
 accumulated energy
 average static pressure
 average temperature
 average differential pressure
 average specific gravity
 average heating value
 flow time
 uncorrected count
Periodic Historical Data Log
Each meter run maintains a periodic data log that holds one record for
every log interval. Each log interval is 15 minutes. The periodic
historical data log holds 1440 records, or four days of 15 minute data.
The periodic historical data log stores the following items:
 flowing differential pressure
 flowing static pressure
 flowing temperature
 frequency
1.7.10 Run Switching
If you use multiple meter runs in the application, you can configure run
switching. Run switching (also known as meter run staging or tube
switching) allows changes to the number of meter runs currently active
to meet the gas flow demand for the station.
1.7.11 Sampler and Odorizer
Samplers are external devices which measure the quality of the gas
stream.
Because natural gas is odorless and colorless, devices called odorizers
inject an additive to the gas stream that allows people to detect the
presence of natural gas in the event of a gas leak.
1.7.12 Chromatograph Interface
If you use a chromatograph to measure gas component information you
can integrate this into the application. You can also specify fixed gas
component percentages to use if the chromatograph fails.