Micronics Portaflow 222, Руководство пользователя

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Portaflow 222 & 333 User Manual Micronics
Page 46 Issue 3.1 Feb 20
8.6 Diagnostics
This feature is designed for advanced users and is intended to provide information that will aid the
user to diagnose problems
–
e.g. no signal strength.
When operating in the FLOW READING mode you can access a diagnostics screen by pressing the
Daigs function key and then selecting Diagnostics from the FLOW READING OPTIONS screen.
This will display the operating values for the following parameters.
ETA
(μs)
Value
the instrument predicts will be the time in μsecs that it should take for
the acoustic wave to propagate across a particular pipe size. This value is
ascertained from the data entered by the user: pipe size, material, sensor set
etc.
ATA
(μs)
Value the instrument measures as the time taken for the acoustic wave to
propagate across the pipe. It is used to see if the signal is being taken from
the burst, at the correct time to get the strongest signal. This value is normally
a few μs below the calculated μs value. If, however, this value is much greater
than the calculated time then there is a problem with the set-up.
Upstream Fluid Time
delta T
Instantaneous Velocity
Cutoff Velocity
Flow (m/s) Flow velocity in m/sec to 3 decimal places.
SNR
Signal Averaged value of Signal and should be a value between 800 and 1600
–
where 800 is approximately 50%, and 1600 is approximately 100%.
Noise
Gain Gain values are typically in the range 600 to 850.
Pipe Bore
Advanced Diagnostics.. Display the Advanced Diagnostics (see below)
8.6.1 Advanced Diagnostics
LFF [ns/m/s]
Average Velocity
Average delta t
Reynolds Number
Correction Factor
Roughness factor
Zero Flow Offset
Calibration factor
Separation distance
Solid time
Flow Side Temperature
Return Side Temperature
Sensor Set
Sensor Mode