KROHNE BM 102 Handbook - Manual (Page 59)

BM 102 59
4.2 Fault clearing
Event
Fault Action
Error messages
“Tank full” status marker on*,
reading frozen at max. or min.
value
No fault. The level has
reached (and possibly risen
above) the top configured
measurement limit and is
either displaying the maximum
(when measuring level) or
minimum (when measuring
distance) output. None. Measurements should
be normal once the level is in
the configured measurement
range.
“Tank empty” status marker
on*, reading frozen at max. or
min. value No fault. The level has entered
the gauge’s bottom dead zone
and can no longer detect a
return signal. Either the
maximum (when measuring
distance) or minimum (when
measuring level) output is
displayed. None. Measurements should
be normal once the level is in
the configured measurement
range.
“Tank full” and “Level lost”
status marker on*, reading
frozen at max. or min. value No fault. The level has entered
the gauge’s top dead zone
and can no longer detect a
return signal. Empty the tank below the top
measurement range limit and
check the measurement.
“Level lost” status marker on*,
reading is frozen The instrument has lost the
level signal, has searched but
not yet found the return pulse.
This may occur if the pulse
has dropped below the
threshold. Parasite signals
from the flange or obstructions
in the tank may render the
gauge unable to identify the
correct signal. Ensure that tank is emptied
below maximum level and
check the measurement.
If the signal is not detected
then modify the control
threshold manually as shown
in sections 3.5.2 and 8.4.2
using the oscilloscope (F7)
and dynamic configuration
(F11) windows in PCSTAR 2.
“Reference not found” status
marker on* Occurs when there is a
problem with the time base on
the HF board. Please contact your local
KROHNE Service Centre**.
“Level lost” and
“Reference not found” status
markers on*, reading frozen The probe has received an
electrostatic discharge. The gauge will search for the
level again and resume
readings. If the reading
remains frozen then the signal
converter may have been
damaged by ESD and may
need replacing. Please
contact your local KROHNE
Service Centre**.
* Gauge connected to PC-STAR 2 software or HART Handheld Controller (HHC) with Marker
status window (F8) or list displayed
** KROHNE service centre contact details are supplied on the last page of this handbook.