Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 126)

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IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
<9. TROUBLE SHOOTING>
The TDLS200 Analyzer troubleshooting is fairly simple for a process analyzer. First, virtually all components used
in the system have a long Mean Time Between Failures (MTBF) with rated life of components typically exceeding
15 years (when operating within their stated specifications). Second, most probable failures and problems are
diagnosed by the system, generating internal warning and fault conditions.
The intent of this guide is to provide common troubleshooting steps, it does not detail specific repair procedures
(such as laser module replacement), as these are unlikely and are detailed in other sections of the manual.
Routine maintenance procedures are also detailed in other sections of the manual.
The most common issues are divided into two categories:
• Warnings. These are conditions which will affect the analyzer reading but not cause complete loss
of measurement integrity. An example would be reduction of transmission (amount of laser power at
the detector) which could indicate misalignment or window fouling, where the measurement is still
being made, but further loss of transmission will cause loss of measurement.
• Faults. These are conditions where the measurement is lost, or degraded past the point of reliability.
An example would be loss of transmission, which could indicate complete missalignment or laser
failure.
The TDLS200 system will diagnose many common warnings and faults, taking the following actions:
• The analyzer generates a status flag that is displayed on the main screen; if only one warning/fault
is present the system will display this on the screen. The “ACTIVE ALARM” menu selection will
allow the user to view all active Warnings and Faults
• The system will log the warning/fault in a log file along with a description, time-triggered and time-
cleared.
• The 4-20 mA signal can change to 3.3 mA under a fault or warning condition (user changeable).
• The digital output of the analyzer will trigger (Channel 1 – Warnings, Channel 2 – Fault, Channel 3 –
Concentration or Transmission)
• The analyzer will capture spectra for diagnostic assistance
• The Results file will indicate a Warning (1) or Fault (2) in the continuous Results file
9 TROUBLESHOOTING