YSI 5200 - Manual (Page 119)

YSI Incorporated 117 5200 Recirculating System Monitor
Section 13. Troubleshooting
The following table describes problems you may encounter when using the YSI 5200 Recirculating
Monitor and provides suggestions to overcome the symptom.
Problem Possible Solution
Display Problems
Check power supply. No display
Remove power (primary and back-up) for 30 seconds then reapply
power.
Instrument software appears
to be locked up as evidenced
by no response to keypad
entries or the display not
changing. Wait at least 3½ minutes for the 5200 to finish transmitting any logged
data via the RS232 port.
Remove power (primary and back-up) for 30 seconds then reapply
power.
Instrument will not respond
even after removing and
reapplying power Remove power (primary and back-up) for 30 seconds. Hold down the
Right Arrow and Enter keys while reapplying power. This will reset
the 5200 to factory default values. It will then be necessary to
reprogram all your settings.
RS485 Network Problems
More than one 5200 is configured as a Master. Make sure only one
5200 is set to Master mode and all other units are in Slave mode. 5200 does not respond after it
is wired to RS485 network
Termination resistors missing/improperly installed. Install termination
resistors on Master unit and last Slave unit only.
Sensor Problems
Sensor not properly calibrated. Follow DO cal procedures.
Membrane cap not properly installed or may be punctured. Replace
membrane cap.
DO sensor electrodes require cleaning. Follow DO cleaning procedure.
Use 5511 Maintenance kit.
Water in sensor connector. Dry connector; reinstall sensor.
Algae or other contaminant clinging to DO sensor. Rinse DO sensor
with clean water.
Altitude entry is incorrect. Repeat DO cal procedure.
Calibrated at extreme temperature. Recalibrate at (or near) sample
temperature.
DO sensor has been damaged. Replace sensor.
Dissolved Oxygen reading
unstable or inaccurate. Out of
Range message appears
during calibration.
Internal failure. Return probe module for service.