General Instruction Manual
Troubleshooting
Display deviating
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IM 01U10B00-00EN-R, 3rd edition, 2018-07-09
10.3 Display deviating
Malfunction
Possible causes
Remedy
Flow rate dis-
played deviates
from actual flow
rate
Zero point set
incorrectly
–
Set zero point, see
[
}
74]
Highest and lowest
value for mass flow
set incorrectly
–
Match settings of flow meter and reading
system.
–
Check LRV and URV process parame-
ters, see software instruction manual.
Measuring tubes not
completely filled with
fluid
–
Correct installation, see
[
}
27]
Bubbles in fluid
–
Check pipe and installation, see
[
}
27]
.
–
Correct installation, see
[
}
27]
Connecting cable in-
correctly connected
for remote type
–
Check cable connections and correct, if
necessary, see
[
}
46]
.
Density displayed
deviating from
actual density
Density unit, highest
and lowest value for
density set incorrectly
–
Match settings of flow meter and reading
system.
–
Check LRV and URV process parame-
ters, see software instruction manual.
Fixed density
–
Check whether the
Val sel
parameter is
set correctly. If a fixed value is selected,
ensure that the parameter
Fix val
is set
correctly, see software instruction
manual.
–
Set parameter
Val sel
to
Meas val
,
see software instruction manual.
Analog output trim
was performed incor-
rectly
–
Correctly perform trimming, see
applicable software instruction manual.
No electrical
grounding
–
Ground transmitter and sensor,
see
[
}
44]
.
–
Check correct connection of connecting
cable shield on transmitter.
Bubbles in fluid
–
Check pipe and installation, see
[
}
27]
.
Connecting cable in-
correctly connected
for remote type
–
Check cable connections and correct, if
necessary, see
[
}
46]
.
Faulty temperature
measurement
–
Check temperature measurement circuits
TP1 – TP3 of connecting cable.
Corrosion and erosion
–
If corrosion or erosion due to corrosive
fluids is suspected, contact Yokogawa
and have density and mass flow recali-
brated, if necessary.
Contaminated
measuring tubes
–
Clean measuring tubes.
