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8. INSTRUMENT MAINTENANCE
8.1. Maintenance Schedule
There is no Internal IZS offered for the T100H.
8.2. Predictive Diagnostics
Because the T100H’s internal pneumatics are monitored in a different manner than those of the T100 there are
some differences in how the instrument’s test functions are used as predictive diagnostics. Table 8-1 of this
addendum supersedes Table 9-2 of the T100 Manual
Table 8-1: Predictive Uses for Test Functions
BEHAVIOR TEST
FUNCTION
DAS
FUNCTION
CONDITION
EXPECTED ACTUAL
INTERPRETATION
Slowly
increasing
Flow path is clogging up.
- Check critical flow orifice & sintered filter.
- Replace particulate filter
PRES SMPPRS
Sample gas
pressure
upstream of the
critical flow
orifice.
Constant within
atmospheric
changes
Slowly
decreasing
Developing leak in pneumatic system to vacuum
(developing valve failure)
VAC VACUUM
Gas pressure
downstream of
the critical flow
orifice (e.g.
inside reaction
cell.
Constant within
atmospheric
changes
Fluctuating
Developing leak in pneumatic system
SAMP FL SMPFLW
Standard
Operation
Stable
Slowly
Decreasing
Flow path is clogging up.
- Check critical flow orifice & sintered filter.
- Replace particulate filter
DRK PMT DRKPMT
PMT output
when UV Lamp
pulses off
Constant within
±20 of check-
out value
Significantly
increasing
PMT cooler failure
Decreasing
over time
Drift of instrument response; UV Lamp output is
excessively low.
SO
2
Concentration
CONC1
Standard
configuration at
span
stable for
constant
concentration
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
deceasing
UV detector wearing out
Opaque oxides building up on UV source Filter
UV lamp aging
07265A DCN6038