Michell Instruments Optidew User Manual page 49

Optidew Series User's Manual
Appendix C Troubleshooting - Common Faults
A list of common faults can be found in this section, along with associated diagnostic
and troubleshooting actions.
• Cannot connect to HyperTerminal / OptiSoft
• Dew-point reading -100 or +473
• Dew-point reading shows fi xed or ambient temperature
• Fixed 100% Mirror Condition
• Fixed fl ashing 0% (low) Mirror Condition
• Peltier power cooling 100%
• Temperature reading -100 or +473 or does not change
• Dew-point reading in error
• Dew-point reading unstable
The troubleshooting steps for each fault should be followed in the order that they
appear.
!
Symptom: Cannot connect to HyperTerminal / Optisoft
Cause
Resolution
Cause
Diagnosis
Resolution
Cause
Resolution Restart Optidew and restart host PC / equipment
Michell Instruments
Do not attempt to disassemble the instrument or sensor.
This will invalidate the calibration and may cause permanent
damage to the instrument, voiding the warranty.
It is permitted to remove the lid of the Optidew for the purpose
of adjusting the mirror condition potentiometer only.
The Optidew Vision must NOT be disassembled.
If unit has display it is not in REMOTE MODE
Enable REMOTE MODE by holding display button for approximately 7
seconds
Unit is RS485 / RS422 communications version
Confi rm unit is RS232 version
To connect to a standard RS232 port on a PC an appropriate RS232 to
RS422 or RS485 adaptor is required
Serial ports have stopped responding on host PC
WARNING:
APPENDIX C
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