Table 28: Diagnostic Parameter Description and Health Indicators
Parameter
Description
Good
Bad
SNR Down
Signal to noise ratio of the
downstream transducer
>5
<2
SNR value between 2 and 5 shall
provide valid measurements but
can be an indication of a problem
with the pipe installation or any other
different local pipe condition. Verify
the clamping fixture alignment,
transducer spacing, transducers,
couplant, all the other connections.
Gain Up / Gain
Down
Gain setting
<0 dB and <35 dB
• In water applications, under
ideal conditions, gain should
be greater than 0 dB and
less than 20 dB.
• For higher viscous liquids,
gain between 20dB and 35
dB is acceptable.
<35 dB or <0 dB
• Gain spreads of 10dB or more
between the channels can be
an indication of a problem with
the pipe installation or any other
different local pipe condition.
• If the gain is negative, change
the Transmit Voltage to “Low”.
If it is still negative, enable
Attenuator. Do not enable
Attenuator if the Transmit Voltage
is high.
• If the gain is greater than 35 dB,
change the Transmit Voltage to
“High”.
Peak Index Up
Threshold peak of the
upstream transmit
correlation signal
• For pipe sizes greater than
1 inch, index should be
between 400 - 700.
• For pipe sizes less than 1 inch,
the index should be between
150 - 350.
• For pipe sizes greater than 1 inch,
if the index <400 or >700 then
there is an indication of problem
with receive window location.
• For pipe sizes less than 1 inch, if
the index <150 or >350 then there
is an indication of problem with
receive window location.
Peak Index Down
Threshold peak of the
downstream transmit
correlation signal
• For pipe sizes greater than
1 inch, index should be
between 400 - 700.
• For pipe sizes less than 1 inch,
the index should be between
150 - 350.
• For pipe sizes greater than 1 inch,
if the index <400 or >700 then
there is an indication of problem
with receive window location.
• For pipe sizes less than 1 inch, if
the index <150 or >350 then there
is an indication of problem with
receive window location.
Wall Time
Transit time inside the pipe
wall
N.A
If the value is negative, then there
is an indication of problem with the
configuration parameters.
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