Fault Diagnosis With Warning Messages; Table 9-2: Front Panel - Teledyne 6400A Instruction Manual

TAI Model 6400A SO

9.1.2 Fault Diagnosis with WARNING Messages

The 6400A monitors several internal values for alarm conditions. If the condition for an alarm is
met, the alarm is displayed on the front panel and the warning is transmitted out the RS-232 port.
Any time the instrument is powered up the SYSTEM RESET alarm will be displayed. Generally,
it is ok to ignore warnings that are displayed shortly after power-up; only if they persist should
they be investigated.
Table 9-2 shows the warning messages and gives some possible causes.
Table 9-2: Front Panel Warning Messages
Message
SYSTEM RESET
RAM INITIALIZED
UV LAMP WARNING
SHUTTER WARNING
HVPS WARNING
SAMPLE FLOW WARNING
SAMPLE PRESS WARNING
BOX TEMP WARNING
RCELL TEMP WARNING
(table continued)
Analyzer Operator Manual, 02164, Rev. G
2
Description
Analyzer was reset/powered on. This warning occurs every time
the instrument is powered up, as in a power failure. It can also
occur if the RAM or EEPROM is reset.
RAM was erased. The RAM contains the DAS averages which
get erased when the RAM is initialized. It also contains
temporary data used by the 6400A to calculate concentrations. No
setup variables are stored in the RAM.
UV lamp output is below 1000mV or above 4995mV or PMT
output above 4995 mV. UV lamp could be aging or need to peak
output by adjusting the position. Also dirty optical system will
cause to read lower.
Shutter system is not functioning properly. Either it is not
energized electrically or has mechanical problem. Strong light
leak could cause false shutter alarm. UV or PMT dark offset is
above 200mV (default value)
HVPS control voltage is above 900 V or below 400 V. Preamp
circuit could be out of adjustment or PMT sensitivity is too weak.
The measured sample flow is outside the hi/low limits. Leak in
pneumatic system is the main cause of the warning although flow
sensor itself could be the cause.
Sample pressure below 15"Hg or above 35"Hg.
Box temp. out of spec. Instrument fan failure, enclosure
temperature failure. Operation of the 6400A in a too warm or cold
environment will cause degradation of data quality and shorten
the life of the instrument.
Reaction cell temp. out of spec. The warning message is most
often present during initial warm-up or poor electrical contact.
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