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Teledyne API – T100 UV Fluorescence SO2 Analyzer Instrument Maintenance
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11.2. PREDICTIVE DIAGNOSTICS
The analyzer’s test functions can be used to predict failures by looking at trends in their
values (refer to Table 11-2) and by comparing them values recorded for them at the
factory and recorded on the T100 Final
Test and Validation Data Form (Teledyne API
P/N 04551) that was shipped with your analyzer.
A convenient way to record and track changes to these parameters is the internal data
acquisition system (DAS). Also, APICOM control software can be used to download
and record these data for review even from remote locations (Section 7.3 discusses
APICOM).
Table 11-2: Predictive Uses for Test Functions
BEHAVIOR
TEST FUNCTION
DAS
FUNCTION
CONDITION
EXPECTED ACTUAL
INTERPRETATION
Fluctuating
Developing leak in pneumatic system
Slowly
increasing
Flow path is clogging up.
- Check critical flow orifice & sintered filter.
- Replace particulate filter
PRES SMPPRS sample gas
Constant within
atmospheric
changes
Slowly
decreasing
Developing leak in pneumatic system to
vacuum (developing valve failure)
DRK PMT DRKPMT
PMT output
when UV Lamp
shutter closed
Constant within
±20 of check-
out value
Significantly
increasing
PMT cooler failure
Shutter Failure
Change in instrument response
At span with
IZS option
installed
Constant
response from
day to day
Decreasing
over time
Degradation of IZS permeation tube
SO
2
Concentration
CONC1
Standard
configuration at
span
stable for
constant
concentration
Decreasing
over time
Drift of instrument response; UV Lamp
output is excessively low.
Slowly
Decreasing
Flow path is clogging up.
- Check critical flow orifice & sintered filter.
- Replace particulate filter
SAMP FL SMPFLW
Standard
Operation
Stable
Fluctuating
Leak in gas flow path.
Fluctuating or
Slowly
increasing
UV detector wearing out
UV source Filter developing pin holes
LAMP RATIO LAMPR
Standard
Operation
Stable and near
100%
Slowly
decreasing
UV detector wearing out
Opaque oxides building up on UV source
Filter
UV lamp aging
06807C DCN6650