Display deviating
Quick Reference Instruction Manual
Troubleshooting
IM01U10A00-00EN-R, 2nd edition, 2017-08-29
53 / 54
Malfunction
Possible causes
Remedy
Density displayed devi-
ating from actual density
Density unit, highest and low-
est value for density set incor-
rectly
–
Match settings of flow meter and reading
system.
–
Check LRV and URV process parameters,
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 soft-
ware instruction manual.
Analog output trim was per-
formed incorrectly
–
Correctly perform trimming, see applicable
software instruction manual.
No electrical grounding
–
Ground transmitter and sensor, see
[
}
31]
.
–
Check correct connection of connecting cable
shield on transmitter.
Bubbles in medium
–
Check pipe and installation, see
[
}
16]
.
Connecting cable incorrectly
connected for remote type
–
Check cable connections and correct, if
necessary, see
[
}
33]
.
Faulty temperature measure-
ment
–
Check temperature measurement circuits
TP1 – TP3 of connecting cable.
Corrosion and erosion
–
If corrosion or erosion due to corrosive media
is suspected, contact Yokogawa and have
density and mass flow recalibrated, if neces-
sary.
Contaminated measuring
tubes
–
Clean measuring tubes.
Temperature displayed
deviating from actual
temperature
Temperature unit, highest and
lowest value for temperature
set incorrectly
–
Match settings of flow meter and reading
system.
–
Check LRV and URV process parameters,
see applicable software instruction manual.
Non-adjustable temperature
–
Check whether the
Func sel
parameter is set
correctly. If a fixed value is selected, ensure
that the
Fix val
is set correctly, see applicable
software instruction manual.
–
Set parameter
Func sel
to
Inter val
.
Analog output trim was per-
formed incorrectly
–
Correctly perform trimming, see applicable
software instruction manual.
Connecting cable incorrectly
connected for remote type
–
Check cable connections and correct, if nec-
essary, see
[
}
33]
.
Incorrect temperature mea-
surement with remote type
–
Check temperature measurement circuit by
measuring resistance between TP1/TP2 and
TP1/TP3. Each value must be between 50 –
200 Ω.
–
Check temperature measurement circuit TP2/
TP3 and make sure that resistance is < 10 Ω.
–
Connect Pt100 simulator and check tempera-
ture measurement.
Output signal deviating
from measured quantity
Incorrect parameter
–
Check parameter
LRV
and
URV
of the corre-
sponding output signal, and correct, if neces-
sary.
Incorrect measured quantity
–
Check measured quantity output and, if nec-
essary, correct; check parameter
Sel
, see ap-
plicable software instruction manual.
