67
Maintenance and troubleshooting
Red
LED
Current
output
Transistor
output
Icon Message dis-
played in the
Info menu
Possible cause Recommended action
OFF 4-20 mA Switched
2)
+
"W:Impedance
Ref"
The impedance of the
reference electrode is
out of range.
The message is dis-
played if the monitoring
of the impedance of
the reference electrode
has been activated,
depending on the set
thresholds WARN LO
and WARN HI (see
chap. 9.13.2).
→ Go into the "Sensor"
function of the Diag-
nostic menu to read
the impedance value
of the reference elec-
trode (chap. 9.13.2).
→ If necessary, clean
then recalibrate the
measurement sensor
or replace it.
OFF 4-20 mA Switched
2)
+
"W:Imped.
Glass"
The impedance of the
pH electrode is out of
range.
The message is dis-
played if the monitoring
of the impedance of the
pH electrode has been
activated, depending
on the set thresholds
WARN LO and WARN
HI (see chap. 9.13.3).
→ Go into the "Sensor"
function of the Diag-
nostic menu to read
the impedance value
of the pH electrode
(chap. 9.13.3).
→ If necessary, clean
then recalibrate the
measurement sensor
or replace it.
OFF 4-20 mA Switched
2)
+
"W:Temperature" The fluid temperature is
out of range.
The message is dis-
played if the monitoring
of the fluid temperature
has been activated,
depending on the set
thresholds WARN
LO and WARN HI
(see chap. 9.13.3).
→ Go into the "Sensor"
function of the
Diagnostic menu to
read the measured
fluid temperature
(chap. 9.13.3).
→ If necessary, check
whether the built-in
Pt1000 is working
correctly by meas-
uring a fluid with a
known temperature.
→ If the Pt1000 is faulty,
return the device to
Bürkert.
→ If the Pt1000 is not
the cause of the
problem, check the
process.
2)
If the "PVAR" function of the "Output.TR1" and/or "Output.TR2" menus is set to "warning" (see chap. 9.11.10); else, the
transistor outputs are operating depending on the set thresholds.
English
Type 8202 ELEMENT
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