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Diagnostic Screens
Evaluating and Controlling the Diagnostics Screen
Process Values
Flow Rate:
Standard Volume Flow Rate: Presents the volumetric flow rate compensated for pressure,
Path Diagnostics
RX Gain (Up – Dn): These values indicate the signal strength of the flow sensor
SNR (Up – Dn): These values indicate the signal to noise ratio of the flow sensor
Status: Indicates the operating condition of the flowmeter. When application conditions are
Correlation Q: This value is derived from a signal (phase) analysis by comparing the phase
% Accepted: This parameter indicates the percentage of acoustic signal
Delta-Time usec: Indicates the displacement (Phase shift) between the upstream vs
Flow & Vos
Flow Velocity: Indicates the speed of flow through the pipe in the velocity units selected in
VoS: Indicates the velocity of sound propagation through the flow medium. The units are in
FS200 Programming Manual, 03/2020,
A5E02951525-AB
The diagnostic data screen presents a significant amount of valuable data for the
purpose of both monitoring and evaluating system performance. The data presented,
their descriptions and their expected values are outlined below.
Presents the actual (Gross) volumetric flow rate in the measurement units
selected in the Flowmeter program
temperature and where applicable; compressibility factor. Only certain versions of the
FS230 flowmeter can produce Standard volume flow data. The volumetric units are as
selected in the Flowmeter program.
(transducer) signal and differentiate between the upstream traveling and downstream
traveling signals. The data is presented in Db with lower values being better. The default
warning limit is any value above 40 while the fail limit is a value above 50.
(transducer) signal and differentiate between the upstream traveling and downstream
traveling signals. The data is presented in Db with higher values being better. The default
warning limit is any value below 20 while the fail limit is a value below 10.
acceptable; and all diagnostic parameters are meeting minimum requirements, the status
will indicate "Measurement". If conditions cause an operating parameter to be
unsuitable; interruption of flow measurement may occur. In such cases the status will
change to indicate the underlying issue
differential of the initial receive signal frequency cycle to that of a later occurring cycle of
the same signal. When the two match perfectly the "Cor-Q" is 1.0. The default value at
which a warning is generated is below 0.95, a Fail is declared if the value is below 0.92
In gas systems where very large signal phase shifts can occur, the Cor-Q can be
improved by performing an "HF" adjustment in the flowmeter "Maintenance and
Diagnostics" menu
transmissions/receives that are used for flow measurement with the ideal value being
100%. If application conditions such as high aeration or noise interference are present,
some of the receive signals will be unacceptable and rejected by the flowmeter. In these
cases, the [% accepted] will decrease. The default warning limit is less than 50%
accepted while the Fail limit is less than 20%.
downstream flow signal and is indicated in microseconds. This differential is caused by
the flow velocity acting upon the flow sensor signal propagation through the flow stream.
the Flowmeter program
the sound velocity units selected in the flowmeter program
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