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Model T101 Instruction 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
remo
te location using Teledyne API’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
BEHAVIOR
TEST
FUNCTION
DAS
FUNCTION
CONDITION
EXPECTED ACTUAL
INTERPRETATION
H2S STB
1
N/A Zero Gas
≤ 1 ppb with
zero air
Increasing
Pneumatic Leaks – instrument &
sample system
Detector deteriorating
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.
PRES SMPPRS sample gas
Constant
within
atmospheric
changes
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
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;
clean RCEL window
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
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.
07266B DCN6485