Optex DOS-20 Instruction Manual page 50

Optical dissolved oxygen sensor
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Error code and details
E3600 to E3699
Sensor error
E4200 to E4299
Calibration error
E4200
M500 to M599
Sensor cap error
MAINT
Maintenance notification
50
Cause
The sensor cable
is broken.
The sensor cable
is not properly
wired.
The sensor is
out of order.
Calibration
failed.
The sensor cap
is not properly
attached.
The sensor cap
has deteriorated.
The sensor cap
replacement
timer has passed.
The maintenance
timer has passed.
Action
Make sure that the cable is
not damaged. If any damage
is found, contact the dealer.
Turn off power of the trans-
mitter, check the wiring, and
be sure to wire properly.
The sensor must be
repaired. Contact the dealer.
Remove dirt and bubbles
from the measurement block
and perform calibration
again. Contact the dealer if
the error occurs again. The
sensor must be repaired.
If the salinity correction
is being made, set the
correction value to 0 PSU
and then perform the
calibration again.
Properly attach it referring
to "3 Attaching the Sensor
Cap" P.8.
Refer to "Replacement of
consumables" P.51 to
replace the sensor cap.
Refer to " ◆ Canceling
sensor cap replacement
notification" P.43 to cancel
the notification.
Refer to the "Universal
Transducer SC-U1
Operation Manual", " ●
Canceling maintenance
notification" to cancel the
notification.

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