Teledyne 6400EH - Sulfur Dioxide Analyzer - Manual (Page 47)

UV Fluorescence SO2 Analyzer Maintenance
Teledyne Analytical Instruments 35
Instrument Maintenance
8.1 Maintenance Schedule
There is no Internal IZS offered for the 6400EH.
8.2 Predictive Diagnostics
Because the 6400EH’s internal pneumatics are monitored in a
different manner than those of the 6400E there are some differences in
how the instruments test functions are used as predictive diagnostics.
Table 8-1 of this addendum supersedes Table 9-2 of the 6400E Manual
Table 8-1: Predictive Uses for Test Functions
TEST
FUNCTION
IDAS
FUNCTION
CONDITION
BEHAVIOR
EXPECTED ACTUAL
INTERPRETATION
PRES SMPPRS
Sample gas
pressure
u
pstream of the
critical flow
orifice.
Constant within
atmospheric
changes
Slowly
increasing
Slowly
decreasing
• Flow path is clogging up.
- Check critical flow
orifice & sintered filter.
- Replace particulate
filter
• Developing leak in
pneumatic system to
vacuum (developing
valve failure)
PRES SMPPRS
Sample gas
pressure
u
pstream of the
critical flow
orifice.
Constant within
atmospheric
changes
Slowly
increasing
Slowly
decreasing
• Flow path is clogging up.
- Check critical flow
orifice & sintered filter.
- Replace particulate
filter
• 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