Yokogawa Extractive Oxygen Gas Analyzer TDLS220 - Manual (Page 72)

<8 TROUBLESHOOTING> 8-4
IM 11Y01B02-01E-A 4th Edition September 11, 2012-00
Yokogawa
Process Temperature out of range. The gas temperature
range for the application is programmed into the analyzer.
Check temperature transducer feed to analyzer from the
heat trace controller
Check to ensure software setting (Advanced Menu, Con-
figure) is correct
If operating outside of temperature range, a re-calibration
may be required – contact Yokogawa
Concentration out of range. The process pressure range for
the application is programmed into the analyzer.
Check to ensure software setting (Advanced Menu, Con-
figure) is correct
L or D unit temp out of range. The Controller Unit has two
built in temperature sensors (backplane and detect board).
This diagnostic is triggered if they sense the ambient tem-
perature is outside of the analyzer design range (-10 to 50C) –
causing the internal temperatures to exceed the preset limit
Check purge system flows and excessive heat output from
SBC and/or other electronic components
Look for excessive heat output from adjacent processes
and/or radiant process and/or direct sunlight
8.3 Analyzer Faults
For analyzer faults it is recommended that you contact Yokogawa Laser Analysis Division immediately.
There is typically no user intervention that should be attempted unless specifically diagnosed or
directed by Yokogawa.
Yokogawa Laser Analysis Division personnel will step you through diagnostic and repair steps.
Laser Temperature Out of Range . This is an indication that the system can not control the laser
temperature, resulting in wavelength instability of the laser.
Detector Signal High . Detector is saturated (i.e. too much detector signal gain) or has been damaged.
Detector Signal Lost . The analyzer is not receiving a detector signal – please check all electrical
connections and follow the procedure for Troubleshooting Low or Lost Transmission.
Outlier Rejection . Future feature – yet to be implemented.
Peak Center Out of Range . Indication that the system can not keep the peak centered in the scan
range. Please review the absorption spectra to check the actual peak position, check that some target
gas in the optical path – capture spectra and send to Yokogawa Laser Analysis Division or local agent
for further assistance.