KROHNE BM 70 M - Manual (Page 68)

68 BM 70 M
Group DA: Display and signal output
No.
Fault / Symptom Cause Corrective action
DA11 Display and signal
output indicate
sizeable step
changes in the
direction of the
maximum (possibly
also minimum)
level. Storage tank: BM 70 M
mounted centrically or on
dome (manhole cover). Change position of the BM 70 M.
For recommended distance from
tank wall,
see Sect. 6.1.2, and note
installation conditions in Sect.
6.1.3!
Or activate "multiple reflection
identifier" under Fct. 3.5.5, see
Sect. 8.6.14.
Process tank with extremely
turbulent product surface. Switch on tank type AGITATOR
under Fct. 3.5.9, see Sect.
8.6.16.
DA12 Display and signal
output indicate
step changes:
during filling
upwards
during draining
downwards Storage tank, smooth
surface, steady filling or
draining procedures,
incorrect tank type set. Set correct tank type
(STORAGE TANK) under Fct.
3.5.9, see Sect. 8.6.16.
DA13 Signal output
(recorder) shows
sinusoidal
variations about
the actually
measured value
(deviation: up to ±
2 cm) in the upper
part of the tank
(approx. 2 m).
This has physical reasons
and occurs mostly with slow
changes in level when
sources of interference are
located in the upper part of
the tank. Avoid all sources of interference
in the upper part of the tank. A
bigger antenna might help to
solve the problem.
DA14 Display and signal
output indicate
constant measured
values, although
the level changes. Fixed tank internals
unfavourably positioned,
thus permanently simulating
a constant level to the BM
70 M. No empty spectrum
recorded and/or
measurements carried out
without empty spectrum. Activate the empty spectrum
under Fct. 3.5.2 if
measurements carried out
without empty spectrum. If
empty spectrum not recorded,
record under Fct. 3.5.2, see
Sect. 8.6.12.
Digital input is activated,
marker 6
is ON,
measurement
is suspended (frozen).
Deactivate the digital input, see
Sect. 4.8
DA15 Display and signal
output indicate
measured values
at the level of the
agitator blades. Tank with "difficult" agitator
blades. Record new empty spectrum
with " MAX. VALUES" under Fct.
3.5.2. Or change position of the
BM 70 M on the tank. Note
conditions described in Sect.
6.1.2.
DA16 Display and/or
signal output
indicate incorrect
conversion values,
but level indication
is correct.
Conversion table set
incorrectly. Reset conversion table with the
PC-CAT program.