KROHNE BM 70 A_P EN - Manual (Page 59)

Installation and operating instructions BM 70 A/P Page: 59 11/00
A3 The measured value at the current
output is incorrect, but the
measured value in the BM 70 A/P
display is correct. Settings of the current output are
incorrect. Set current output correctly as described
in Sect. 8.6.8 (Fct.3.3.1 - 3.3.4).
A4 Data Communication via the digital
interface not functioning. Communication interface set
incorrectly. Set Communication interface, Sect. 8.6.9,
correctly (Fct.3.3.5 - 3.3.7).
The computer system for
Communication with the BM 70 A/P
is incorrectly configured. Check computer system.
Incorrect connection to the
interface. Check connection.
Communication interface is
defective. Consult KROHNE Service or replace
BM 70 A/P instrument head as described
in Sect. 7.3.
Group DA Display and signal output
No. Fault / Symptom Cause Corrective action
DA1 Display and current output supply
incorrect measured values. Display and current output are set
incorrectly. 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.
An error has occurred. Display and
current output are, however, not set
for error messages; markers 1-6 are
perhaps ON. Invoke Error List, see Sect. 8.8, also
for cause and elimination.
If (also) one or several markers
6
are
ON, see Sect. 8.8.2.
DA2 Display and current output supply a
largely constant measuring error of
approx. 19 cm. Distance piece is provided but not
configured correctly. Set Fct. 3.1.5 DIST.PCE. (see
Sect.8.6.4) to 120 mm when distance
piece fitted, otherwise to 0 mm.
DA3 Display and current output supply a
largely constant and large-size
measuring error. Tank height set incorrectly (level
measurement). 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)
Reference offset (distance
measurement) or tank bottom offset
(level measurement) incorrectly
progra mmed. Set offset values correctly, Fct. 3.1.7 -
3.1.8 (see Sect. 8.6.6).
DA4 Measuring error in the stilling well
increases steadily in step with
increasing distance. Stilling well not included in the
configuration. Set Fct. 3.1.6 STILLWELL correctly
(see Sect. 8.6.5).
DA5 major measuring errors (> 3 cm)
with Wave-Stick in the close range
(up to approx. 1 m distance) Antenna type is incorrectly set. Set Fct. 3.1.3. ANTENNA to "WAVE-
STICK" (see Sect. 8.6.3)
DA6 When the empty tank is being filled,
the measured value initially stays at
"zero" and then, at 20...100 cm
level, suddenly skips to the correct
value. The BM 70 A/P is receiving an
additional signal from the tank
bottom. Activate "tank bottom tracking system",
see Sect. 8.6.15 (Fct. 3.5.7 - 3.5.8)
DA7 Display and signal output do not
respond to changes in level. Digital input is activated,
marker 6
6
is ON, measurement is
suspended (frozen).
Deactivate the digital input, see Sect.
4.8.
Device is within block distance
detection range, marker 6
6
is ON;
level too high or antenna
contaminated.
Reduce level and/or clean antenna, or
deactivate Fct. 3.5.6 BD-DETECT (see
Sect. 8.6.14) or reduce size of Fct.
3.1.2 BLOCKDIST. (see Sect. 8.6.3).
Foaming in vessel, inadequate
reflectivity of the tank product,
ε
R
too small; additionally, markers 1+3
6
may be ON.
On tall storage tanks, mount the BM 70
A/P farther away from the tank wall.
Select distance as recommended in
Sect. 6.1.2.
DA8 Display and signal output indicate
"zero" measured value, marker 5
6
is 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. Drain tank or switch the BM 70 A/P off
for a short while. If unsuccessful,
please consult KROHNE Service.
DA9 Display and signal output indicate
max. level but tank is empty. Tank with dished bottom: the BM 70
A/P has stored an incorrect or
incomplete empty spectrum. 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.