91
Group
Fault / Symptom
Cause
Remedy
Group E
E1
Control input does not
function
Connection / polarity
incorrect.
Correct as per Sect. 3.3
Programming incorrect
Correct the programming
as per Fct. 3.6.1 - 3.6.2.
Test as per Fct. 2.15. If
test is faulty, the output is
faulty. Replace converter
or call Krohne Service.
Control input switched off.
Switch on as per Fct.
3.6.1
Group ST
ST1
Display keeps returning
to “test”. (during start-up)
Poor/intermittant power.
Supply to meter.
Check incoming supply
Hardware failure
Replace converter or call
Krohne Service.
ST2
Display returns to “Start
up” and the status arrow
is illuminated.
Possible poor mechanical
installation.
Check install factor and
correct installation as per
Section. 1
Check the status list in
reset/quit menu as per
Section 5.5 and
acknowledge the error
message.
Primary Sensor faulty
Check as per Sect. 9.8
Fuse F11 blown. (negative
analog voltage).
Call Krohne Service.
ST3
Display returns to Start-
up and the primary
sensor is noisy.
Sensor cannot vibrate
freely due to poor
mechanical installation.
Correct installation as per
Section 1 and try again.
Group OP
OP1
Installation factor larger
than value given in Sect.
4.3
Mechanical installation not
correct or air bubbles in
process fluid. External
influences due to pumps,
motors, etc.
Check installation and
correct if necessary (see
Section 1). Flush process
pipe work to get rid of air.
OP2
Display indicates a flow-
rate during zero setting.
Valves closed.
Valves not shut tight or air
in process fluid.
Check valves for tight shut-
off. Flush lines with high
velocity.
Zero calibration not OK
Check that flow is zero and
pipe is full without air
bubbles. Do automatic
calibration as per Section
6.1 and ensure that a “0” is
programmed in the zero
set function.
