Predictive Diagnostics; Maintenance Procedures; Table 9-2: Predictive Uses For Test Functions - Teledyne 200E Instruction Manual

Model 200E Instruction Manual

9.2. Predictive Diagnostics

The analyzer's test functions can be used to predict failures by looking at trends in their
values. Initially it may be useful to compare the state of these test functions to the values
measured on your instrument at the factory and recorded on the M200E Final Test and
Validation Data Form (T-API part number 04490, attached to the manual). Table 9-2 can be
used as a basis for taking action as these values change with time. The internal data
acquisition system (iDAS) is a convenient way to record and track these changes. APICOM
control software can be used to download and review these data even from remote
locations (Section 6.11.5 describes APICOM).
Function Expected
RCEL Constant to
pressure within ± 0.5
Constant
SAMPLE within
pressure atmospheric
changes
Ozone Constant to
Flow within ± 15
Constant
within ±20 of
AZERO
check-out
value
Constant for
NO2
constant
CONC
concentrations
NO2 Constant
CONC response from
(IZS) day to day
NO2 Constant
CONC response from
(IZS) day to day
Constant for
NO CONC constant
concentration

9.3. Maintenance Procedures

The following procedures need to be performed regularly as part of the standard
maintenance of the Model 200E.
044100102 Rev A
Table 9-2: Predictive Uses for Test Functions
Actual
Fluctuating
Slowly increasing
Fluctuating
Slowly increasing
Slowly decreasing
Slowly decreasing
Significantly
increasing
Slowly decreasing
signal for same
concentration
Decreasing over
time
Heavily fluctuating
from day to day
Decreasing over
time
Instrument Maintenance
Interpretation & Action
Developing leak in pneumatic system. Check for
leaks
Pump performance is degrading. Replace pump
head 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. Leak check.
O air filter cartridge is exhausted. Change
3
chemical
Converter efficiency may be degrading. Replace
converter.
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, change O air filter chemical.
3
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