Teledyne 6200T - Sulfides Analyzer - Manual (Page 227)

6200T Total Sulfur Analyzer Maintenance
Teledyen Analytical Instruments 227
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 6200T Final Test and Validation Data Form (Teledyne
Analytical Instruments 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, AICOM control software can be used to download and
record these data for review even from remote locations (Section 7.3 discusses AICOM).
Table 11-2: Predictive Uses for Test Functions
TEST FUNCTION
DAS
FUNCTION
CONDITION BEHAVIOR
INTERPRETATION
EXPECTED ACTUAL
PRES SMPPRS sample gas
Constant within
atmospheric
changes
Fluctuating  Developing leak in pneumatic system
Slowly
increasing
 Flow path is clogging up.
- Check critical flow orifice & sintered filter.
- Replace particulate filter
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
SO
2
Concentration
CONC1
At span with
IZS option
installed
Constant
response from
day to day
Decreasing
over time
 Change in instrument response
 Degradation of IZS permeation tube
Standard
configuration at
span
stable for
constant
concentration
Decreasing
over time
 Drift of instrument response; UV Lamp
output is excessively low.
SAMP FL SMPFLW
Standard
Operation
Stable
Slowly
Decreasing
 Flow path is clogging up.
- Check critical flow orifice & sintered filter.
- Replace particulate filter
Fluctuating  Leak in gas flow path.
LAMP RATIO LAMPR
Standard
Operation
Stable and near
100%
Fluctuating or
Slowly
increasing
 UV detector wearing out
 UV source Filter developing pin holes
Slowly
decreasing
 UV detector wearing out
 Opaque oxides building up on UV source
Filter
 UV lamp aging