Table of Contents
Operation
5.2 Diagnostic Error Messages
When a diagnostic error or status condition occurs, the Online Display alternates
between measured DO and a text message.
What you see
CnFG
Configuration or Calibration data is
defective.
FALt
Unit electronics are defective.
These errors may occur when on-line DO Concentration or on-line Temperature is
displayed.
dOHI
Measured DO is > 20 ppm/200 ppb
PrbE
Probe is defective, wrong type, or not
connected.
Probe current is excessive with probe
voltage near 0 volts
Forces the output to burnout level (greater
than 22 mA).
Measured temperature is > 60 C
T HI
Measured temperature is < 2.0 C
T LO
Probe Bias Error:
BErr
Probe current has exceeded expected
probe current by 33% If the excessive
current condition continues after a
manual probe bias, the PrbE error is
generated. If excessive current is not
present then the bErr remains
Application related shift in probe bias
voltage.
24
Table 5-3 Online Diagnostic Errors
Cause of Error
DirectLine® DL424/425 Sensor Module User Manual
What to do
Reset unit or cycle power.
Second occurrence will
show FALt.
Replace electronics module.
Bring process within limits
Check for an electrical short
between the anode and the
cathode.
Check the reference
electrode connection.
When the source of the
error is removed, the error
will clear and the output will
return to normal operation.
Bring process within limits
Bring process within limits
Remove the probe from
process and do a probe
bias calibration. In ppm
applications in processes
containing CO
, the probe
2
may be left in the process
and the probe bias can be
manually adjusted.
Remove the probe from the
process and do an Air
Calibration.
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