5707070-A Troubleshooting and Customer Support 3-5
Sono-Trak™ Doppler Ultrasonic Flow Meter
STATUS OF ECHO LED: FLASHING
Is the Echo LED flashing?
4
No. If the Echo LED light is on steady, continue on to “Status of Flow
Reading: High or Low” on page 3-6.
4
Yes. If the Echo LED light is flashing, troubleshoot using Table 3-3 below.
Note: Review the three questions in Table 3-3. If you can answer yes to all three, and
you have determined that you do not have a power issue, you may have an
application that would be better suited for a transit time meter. See
“Determining if Your Process/Installation is Right for a Doppler Flow Meter”
on page 2-3 and “Additional Troubleshooting Information” on page 3-9.
Has the pipe been cleaned
down to bare metal before
transducer placement? Is this an
old pipe?
Make sure the pipe was cleaned with sandpaper prior to
transducer placement. Also, check to make sure the type of
pipe in your application is suitable for use with a Doppler
flow meter.
See “Assessing Pipe Material and Condition” on page 2-5.
Is the measured fluid too clean,
or is the particle content
fluctuating below readable
specifications?
Verify that suspended solid content of fluid is at least 40
microns @ 35 ppm with at least a 0.2% density difference
from the liquid.
See “Suspended Particle Test For Doppler Signals” on
page 3-10 to check your fluid for particle content, and also
consult “Determining if Your Process/Installation is Right
for a Doppler Flow Meter” on page 2-3.
Note: Use a transit time meter if the fluid does not meet the
suspended solid specifications of a Doppler flow
meter. Contact “EMCO Flow Systems Support” on
page 3-11 for more information.
Table 3-2. Status of Echo light troubleshooting checklist: Echo off
Question/ Possible Cause Corrective Action
