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Glossary
% Accepted
Percentage of all acoustic transmit/receive signals used for flow measurement analysis. 100%
is perfect. If application conditions such as aeration or noise interference are present this
number may decrease.
AGA-8
The AGA8 function is used to calculate the compressibility factor of natural gas and related
hydrocarbon gases. The internal AGA8 lookup table provides for the actual gas density and
compressibility factor (Z Actual) for the indicated pressure and temperature. These values
are then used to compute either mass flow rate or standard volume corrected flow rate.
Channel
An assignable input / output terminal for the purpose of connecting communication cabling,
I/O signal wiring or RTDs to an FS230 Flowmeter.
Correlation Q
Quality of correlation (phase coherency) between the upstream and downstream receive
signals. Cor-Q ranges from 0.9 to 1.0, where 1.0 indicates perfect correlation and 0.9
indicates ambiguous or poor correlation. Poor correlation is generally a result of acoustic
“beam blowing” due to high flow velocities in gas applications. Cor-Q can be improved
through an “HF” adjustment in the flowmeter.
Delta-time
(uSec)
Transit-time difference between upstream and downstream receive signals caused by flow
velocity. It is measured in microseconds.
Estimated Repeatability
The estimation of the maximum deviation in agreement between the results of
successive flow measurements carried out under the same conditions.
Path (N)
One of at least two (or four) physical flow measurement channels that comprise a multi-
path (or multi-beam) flow meter.
RxGain
Amplifier Gain setting that responds to varying receive signal amplitude. Lower is
better. Values undue 40 are acceptable for flow measurement.
Signal
The digitized acoustic (Receiver) signal.
FS2
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0 Programming Manual, 03/2020,
A5E02951525-AB