Manual

52
Maintenance and troubleshooting
Problem
Bargraph
state
Red LED state
Green LED
state
Current or
frequency
output
state
Meaning / Cause Recommended action
The flow rate
measure-
ments are not
stable
Unstable OFF Flashes once
every second
> 4 mA
and
> 0 Hz
The electrodes are dirty.
→ Clean the electrodes (see chap.
10.3).
The electrodes are not in
contact with the fluid.
→ Make sure the electrodes are always
in contact with the fluid
Air bubbles appear in the
fluid.
→ Respect the mounting recommenda-
tions (see chap. 8.2).
→ Select the "slow" filter (see chap.
9.5).
The flow sensor has not
been immersed for 24 h
before calibration of the
"flow zero" point.
→ Respect the calibration procedure
(see chap. 9.7).
The flow rate fluctuations
are very important.
→ Select the "slow" filter (see chap.
9.5).
Upstream-downstream
connection has not been
correctly done.
→ Respect the mounting recommenda-
tions (see chap. 8.2).
The device
transmits no
current or no
frequency at
all.
shows a
value
OFF Flashes once
every second
0 mA and/or
0 Hz
The position of the sink/
source selector is not
correct.
→ Correctly position the sink/source
selector (see chap. 8.3.1).
The outputs are not cor-
rectly wired.
→ Check the wiring of the outputs (see
chap. 8.3.1, 8.3.2, 8.3.3).
The sensor
does not
measure a nil
flow rate.
Lit OFF Flashes once
every second
> 4 mA and
> 0 Hz
The calibration of the flow
zero point has not been
correctly done.
→ Calibrate again (see chap. 9.7).
English
Type 8041