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U327_UFAUVALDG16_B_e_170808
www.hoentzsch.com
13/15
16 Troubleshooting
Fault
Cause
Troubleshooting
green LED does not light
up
no power supply
check connecting cable, measure volt-
age at connecting terminals
transducer electronics faulty
return to factory
yellow LED lights up,
green LED does not flash
despite flow, analog
output = error (<3.6 mA
or < -0.2V)
cable break or short-circuit
check terminals,
check cable for continuity and replace if
necessary
transducer or sensor electronics
faulty
return to factory
yellow LED lights up,
green LED flashes with
flow, analog output =
error (<3.6 mA or
< -0.2V)
parameter error
check parameter with UCOM software,
save new checksum
(or return to factory)
transducer electronics faulty
return to factory
no measured value
sensor contaminated
clean sensor according to instructions
profile factor set at 0.000
set profile factor at '1.000'
measured value too low sensor contaminated
clean sensor according to instructions
profile factor set too low
set profile factor at '1.000'
input/output section too short
change sensor position, improve flow
conditions with a flow rectifier
rotational flow
reposition sensor in flow direction, in-
stall flow rectifier
vortex VA sensors:
reduced acoustic coupling in the
sensor elements as a result of
intense vibration or powerful
impact
return sensor to factory for performance
test
burden at current ouput is
greater than specified in the
Technical Data Sheet resulting
in correct output values in the
lower range and no longer in-
creasing values at the top end
of the measuring range
reduce resistance
incorrect scaling of analog out-
put
check setting and amend if necessary
measured value too high profile factor set too high
set profile factor at '1.000'
EMC problem
see under 6.3
