Endress+Hauser Levelflex M FMP45 Operating Instructions Manual page 70

Trouble-shooting
70
Code Description
W601 linearisation ch1 curve not
monotone
W611 less than 2 linearisation
points for channel 1
W621 simulation ch. 1 on
E641 no usable echo
channel 1
check calibr.
W650 Signal/noise ratio too low
or no echo
E651 level in safety distance - risk
of overspill
A671 linearisation ch1 not
complete, not usable
W681 current ch1 out of range
Levelflex M FMP45 with HART/4...20 mA
Possible cause
linearization not monotonously increasing correct linearisation table
number of entered linearization points < 2 correct linearisation table
simulation mode is active
echo lost due to application conditions of
built up on antenna
noise on signal to high
level in safety distance
linearisation table is in edit mode
current out of range
(3.8 mA ... 21,5 mA)
Remedy
switch off simulation mode
check installation;
clean probe (cf. Operating
Instructions)
eliminate electromagnetic
interference
alarm will disappear as soon as level
leaves safety distance
activate linearisation table
check calibration and linearisation
Endress + Hauser