69
Maintenance and troubleshooting
Type 8228
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:Conductivity" The fluid conductivity is
out of range.
The message is
displayed if the
monitoring of the fluid
conductivity 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
Diagnostic menu to
read the measured
fluid temperature
(chap. 9.13.2).
→ If necessary, clean and/
or recalibrate the con-
ductivity sensor.
→ If necessary, check the
process.
OFF 4-20 mA Switched
2)
+
"W:Temperature" The fluid temperature is
out of range.
The message is
displayed 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
temperaure probe is
working correctly by
measuring a fluid with
a known temperature.
→ If the temperature
probe is faulty, return
the device to Bürkert.
→ If the temperature
probe is not the cause
of the problem, check
the process.
OFF 4-20 mA Switched
2)
"M:Calib. Date" A calibration of the con-
ductivity sensor is due.
The periodicity of the
calibrations is set
within the "INTERVAL"
function of the "CALIB
INTERVAL" menu (see
chap. 9.12.4).
→ Calibrate the
conductivity sensor
(chap. 9.12.4).
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.
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