Baker Panametrics PanaFlow XMT1000 - 4.10 Diagnostics Data

PanaFlow™ XMT1000 User’s Manual 75
Chapter 4. Error Codes and Troubleshooting
4.10 Diagnostics Data
To determine the health of the meter, XMT1000 has built-in diagnostic parameters. Please refer to Table 28 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 28: Diagnostic Parameters
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”.