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Teledyne ML - T101 Operation Manual
Instrument Maintenance
201
8.2.
PREDICTIVE DIAGNOSTICS
The analyzer’s test functions can be used to predict failures by looking at trends in their
values. The current value of these functions can be viewed via the front panel, recorded
via the DAS system (see Section 4.8) or even downloaded via the internet from a
remote location using Teledyne ML’s APICOM control software can be used to
download and review these data (see Section 5.1.2.9).
Table 8-2 Predictive Uses for Test Functions
TEST
FUNCTION
DAS
FUNCTION
CONDITION
BEHAVIOR
INTERPRETATION
EXPECTED
ACTUAL
H2S STB
1
N/A
Zero Gas
≤ 1 ppb with
zero air
Increasing
•
Pneumatic Leaks – instrument &
sample system
•
Detector deteriorating
PRES
SMPPRS
sample gas
Constant
within
atmospheric
changes
Fluctuating
•
Developing leak in pneumatic system
Slowly
increasing
•
Flow path is clogging up.
•
Developing leak in pneumatic system
to vacuum
- Check critical flow orifice &
sintered filter.
Slowly
decreasing
•
Replace particulate filter
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;
clean RCEL window
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
H2S OFFS
1
OFSET1
During Zero
Cal
Stable
Slowly
increasing or
decreasing
•
Bad PMT
•
Failed HVPS
•
Leak in sample gas flow
•
Contamination in zero gas source.
H2S SLOPE
1
SLOPE1
During Span
Cal
Stable
Slowly
increasing or
decreasing
•
UV lamp aging
•
UV detector wearing out
•
Leak in Sample gas or calibration gas
flow path
•
Deterioration / contamination of
calibration gas source(s)
1
Shown as they appear when analyzer is in H
2
S mode. In SO
2
mode appear as SO2 OFFS & SO2 SLOPE. In multigas
mode, both versions appear.
Содержание T101
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