Teledyne 6200E - Sulfides Analyzer - Manual (Page 192)

Instrument Maintenance Model 6200E Instruction Manual
192 M6200E Rev: A1
9.2. 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 iDAS
system (see Section 6.11) or even downloaded via the internet from a remote location using
Teledyne Analytical Instruments’ APICOM control software can be used to download and review
this data (see Section 6.12.2.8).
Table 9-2: Predictive Uses for Test Functions
BEHAVIOR TEST
FUNCTION
iDAS
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.
- 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;
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.