Baker Panametrics PanaFlow LC, User Manual, Page: 51 / 68

PanaFlow™ LC User’s Manual 43
Chapter 4. Error Codes and Troubleshooting
To determine the health of the meter, PanaFlow™ LC has built-in diagnostic parameters. Please refer to Table 8 below
for diagnosing any problems with the system. If the meter shows errors and the diagnostics data indicate issues, fill
in the User/Service record appendix before contacting Panametrics factory.
Table 8: Diagnostic Parameter Description and Health Indicators
Parameter Description Good Bad
Sound Speed Measured speed of
sound of the fluid
• Under ideal conditions
sound speed should be
within 5 ft/s (1.5 m/s)
between channels.
• Depending on flow
viscosity, flow rate, there
can be slightly different
sound speed showing
on different channels.
This could be normal
due to different signal
path.
• Under ideal conditions, sound
speed spread of 30 ft/s (9 m/s) or
more between the sound speed
measurement of the channels
can be an indication of a problem
with the pipe installation or any
other different local pipe
condition.
SNR Up Signal to noise ratio of
the upstream
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.
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.