10. Troubleshooting
10.1 Problem Situations
Problem Possible Cause Remedy
Analog output reading is
unchanging and appears incorrect.
Analog output is in error state. Remove the cause of the error
state and the analog output will
recover its normal function.
Probe outputs stars "****" on serial
line instead of measurement data.
Incorrect supply voltage. Check the power supply.
Check the active errors using the
ERRS command on the serial line.
Unsuitable operating environment. Verify that the operating
environment is within specified
operating limits.
Unable to access probe on the
RS-485 line.
Incorrect wiring. Check that the RS-485 connection
is wired correctly.
Probe in POLL mode with unknown
address.
Power cycle or reset the probe and
try again.
CO
2
measurement not working. Condensation on the sensor. Remove the filter and check if
condensation has formed on the
sensor. If yes, dry out the
condensation with instrument air
and insert a new dry filter. Keep the
probe powered and operating to
prevent re-occurrence.
More Information
‣
Wiring (page 25)
‣
Analog Output Error State (page 100)
10.2
Error Messages
The error messages are categorized according to the severity of the status:
• Critical errors are fatal to the operation of the unit. It may not be able to respond to
communication at all, and will not measure correctly.
• Errors prevent CO
2
measurement and cause the analog outputs to be set to the error
state. Depending on the problem, errors may resolve themselves. For example, sensor
heating will eventually dry out condensation on the optical surfaces.
• Warnings do not prevent normal operation but may indicate possible problems.
• Status indicates a known state of the unit.
Chapter 10 – Troubleshooting
99
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