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Operation
9/11 DirectLine®
DL424/425 Sensor Module User Manual
25
What you see
Cause of Error
What to do
FAIL
This error can occur if
The probe current is too low or if the
probe readings are unstable during air
calibration.
There is excessive probe current
during a Probe bias voltage calibration
An air calibration can not be completed
and the previous air calibration value is
used for measurement of dissolved
oxygen.
Verify that Probe has been
removed from the process.
Verify that probe has
reached equilibrium with the
process
Press Mode to return to
online display.