KROHNE BM 70 A Installation And Operating Instructions Manual page 59

The measured value at the current
A3
output is incorrect, but the
measured value in the BM 70 A/P
display is correct.
A4 Data Communication via the digital
interface not functioning.
Group DA Display and signal output
No. Fault / Symptom
Display and current output supply
DA1
incorrect measured values.
Display and current output supply a
DA2
largely constant measuring error of
approx. 19 cm.
Display and current output supply a
DA3
largely constant and large-size
measuring error.
Measuring error in the stilling well
DA4
increases steadily in step with
increasing distance.
DA5 major measuring errors (> 3 cm)
with Wave-Stick in the close range
(up to approx. 1 m distance)
When the empty tank is being filled,
DA6
the measured value initially stays at
"zero" and then, at 20...100 cm
level, suddenly skips to the correct
value.
Display and signal output do not
DA7
respond to changes in level.
DA8 Display and signal output indicate
"zero" measured value, marker 5
is ON.
Display and signal output indicate
DA9
max. level but tank is empty.
Installation and operating instructions BM 70 A/P
Settings of the current output are
incorrect.
Communication interface set
incorrectly.
The computer system for
Communication with the BM 70 A/P
is incorrectly configured.
Incorrect connection to the
interface.
Communication interface is
defective.
Cause
Display and current output are set
incorrectly.
An error has occurred. Display and
current output are, however, not set
for error messages; markers 1-6 are
perhaps ON.
Distance piece is provided but not
configured correctly.
Tank height set incorrectly (level
measurement).
Reference offset (distance
measurement) or tank bottom offset
(level measurement) incorrectly
progra mmed.
Stilling well not included in the
configuration.
Antenna type is incorrectly set.
The BM 70 A/P is receiving an
additional signal from the tank
bottom.
Digital input is activated,
marker 6 is ON, measurement is
suspended (frozen).
Device is within block distance
detection range, marker 6
level too high or antenna
contaminated.
Foaming in vessel, inadequate
reflectivity of the tank product,
too small; additionally, markers 1+3
may be ON.
Tank with dished bottom: tank is
more than 20% full, the BM 70 A/P
is mistakenly located in the "tank
bottom detection" range.
Tank with dished bottom: the BM 70
A/P has stored an incorrect or
incomplete empty spectrum.
Page: 59
Set current output correctly as described
in Sect. 8.6.8 (Fct.3.3.1 - 3.3.4).
Set Communication interface, Sect. 8.6.9,
correctly (Fct.3.3.5 - 3.3.7).
Check computer system.
Check connection.
Consult KROHNE Service or replace
BM 70 A/P instrument head as described
in Sect. 7.3.
Corrective action
Set display (Fct. 3.2.1 -3.2.4) and
current output (Fct. 3.3.1 - 3.3.4)
correctly, as described in Sect. 8.6.7
and 8.6.8.
Invoke Error List, see Sect. 8.8, also
for cause and elimination.
If (also) one or several markers
ON, see Sect. 8.8.2.
Set Fct. 3.1.5 DIST.PCE. (see
Sect.8.6.4) to 120 mm when distance
piece fitted, otherwise to 0 mm.
Set Fct. 3.1.1 TANKHEIGHT (see
Sect.8.6.2) correctly; if possible, use
automatic tank height determination,
Fct. 3.5.1 (see Sect. 8.6.11)
Set offset values correctly, Fct. 3.1.7 -
3.1.8 (see Sect. 8.6.6).
Set Fct. 3.1.6 STILLWELL correctly
(see Sect. 8.6.5).
Set Fct. 3.1.3. ANTENNA to "WAVE-
STICK" (see Sect. 8.6.3)
Activate "tank bottom tracking system",
see Sect. 8.6.15 (Fct. 3.5.7 - 3.5.8)
Deactivate the digital input, see Sect.
4.8.
Reduce level and/or clean antenna, or
deactivate Fct. 3.5.6 BD-DETECT (see
is ON;
Sect. 8.6.14) or reduce size of Fct.
3.1.2 BLOCKDIST. (see Sect. 8.6.3).
On tall storage tanks, mount the BM 70
ε
A/P farther away from the tank wall.
R
Select distance as recommended in
Sect. 6.1.2.
Drain tank or switch the BM 70 A/P off
for a short while. If unsuccessful,
please consult KROHNE Service.
Record new empty tank spectrum, see
Sect. 8.6.12 (Fct. 3.5.2), or enlarge
block distance (Fct. 3.1.2) as described
in Sect. 8.6.3.
are
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