Siemens SITRANS FC720 Operating Instructions Manual page 145

Display deviating
Malfunction
Density displayed
deviating from
actual density
Temperature
displayed
deviating from
actual temperature
Possible causes Remedy
– Match settings of flow meter and reading
Density unit, highest
and lowest value for
– Check LRV and URV process
density set incorrectly
– Check whether the Val sel parameter is
Fixed density
– Set parameter Val sel to Meas val, see
Analog output trim
– Correctly perform trimming, see
was performed
incorrectly
– Ground transmitter and sensor, see
No electrical
grounding
– Check correct connection of connecting
Bubbles in fluid – Check pipe and installation, see [} 90].
Connecting cable
– Check cable connections and correct, if
incorrectly connected
for remote type
Faulty temperature – Check temperature measurement circuits
measurement
– If corrosion or erosion due to corrosive
Corrosion and erosion
Contaminated
– Clean measuring tubes.
measuring tubes
– Match settings of flow meter and reading
Temperature unit,
highest and lowest
value for temperature
– Check LRV and URV process
set incorrectly
– Check whether the Func sel parameter is
Non-adjustable
temperature
– Set parameter Func sel to Inter val.
Analog output trim
– Correctly perform trimming (see
was performed
incorrectly
Connecting cable
– Check cable connections and correct, if
incorrectly connected
for remote type
– Check temperature measurement circuit
Incorrect temperature
measurement with – Check temperature measurement circuit
remote type
– Connect Pt100 simulator and check
A5E52748387-AA, 2023/09
Troubleshooting
system.
parameters, see Function Manual.
set correctly. If a fixed value is selected,
ensure that the parameter Fix val is set
correctly, see Function Manual.
Function Manual.
applicable Function Manual.
[} 106].
cable shield on transmitter.
necessary, see [} 108].
TP1 – TP3 of connecting cable.
fluids is suspected, contact Siemens and
have density and mass flow recalibrated,
if necessary.
system.
parameters, see Function Manual.
set correctly. If a fixed value is selected,
ensure that the Fix val is set correctly,
see Function Manual.
applicable Function Manual).
necessary, see [} 108].
by measuring resistance between TP1/
TP2 and TP1/TP3. Each value must be
between 50 – 200 Ω.
TP2/TP3 and make sure that resistance
is < 10 Ω.
temperature measurement.
FC7x0
145 / 180