Predictive Diagnostics - Teledyne T200 Operation Manual

Teledyne API – T200 NO/NO

11.2. PREDICTIVE DIAGNOSTICS

Table 11-2: Predictive Uses for Test Functions
FUNCTION EXPECTED
RCEL Constant to within
(pressure) ± 0.5 in-Hg-A
Constant within
SAMP
atmospheric
(pressure)
Constant to within
OZONE FL
Constant within
±20 of check-out
AZERO
Constant for
NO
2
(Concentration)
concentrations
NO
2
with IZS Option
response from day
installed
(Concentration)
Constant for
NO
(Concentration)
concentration
06858E DCN7057
/NO Analyzer Operation Manual
2 X
Predictive diagnostic functions, including failure warnings and alarms built into the
analyzer‟s firmware, aid in determining whether and when repairs are necessary.
The Test Functions can also be used to predict failures by looking at how their values
change over time, compared to the values recorded on the printed record of the Final
Test and Validation Data Sheet, P/N 04490. The internal data acquisition system (DAS)
is a convenient way to record and track these changes. Use APICOM (Section 8.1.1) to
download and review this data from a remote location.
The following table, checked weekly, can be used as a basis for taking action as these
values change with time.
ACTUAL
Fluctuating
Slowly increasing
Fluctuating
Slowly increasing
changes
Slowly decreasing
Slowly decreasing
± 15
Significantly increasing
value
Slowly decreasing
constant signal for same
concentration
Decreasing over time
Constant
to day
Heavily fluctuating from
day to day
constant Decreasing over time
INTERPRETATION & ACTION
Developing leak in pneumatic system. Check for leaks.
Pump performance is degrading. Rebuild pump when pressure
is above 10 in-Hg-A.
Developing leak in pneumatic system. Check for leaks.
Flow path is clogging up. Replace orifice filters.
Developing leak in pneumatic system to vacuum (developing
valve failure). Check for leaks.
Flow path is clogging up. Replace orifice filters.
Developing AZERO valve failure. Replace valve.
PMT cooler failure. Check cooler, circuit, and power supplies.
Developing light leak.
O air filter cartridge is exhausted. Change chemical.
3
Converter efficiency may be degrading. Replace converter
components.
Change in instrument response. Low level (hardware) calibrate
the sensor.
Degradation of IZS permeation tube. Change permeation tube.
Ambient changes in moisture are affecting the performance.
Add a dryer to the zero air inlet.
Drift of instrument response; clean RCEL window. Check for
flow leaks or irregularities.
Instrument Maintenance
209