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Teledyne API - Model T200H/T200M Operation Manual Instrument Maintenance
207
6.2. 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 T200H/M Final
Test and Validation Data Form (Teledyne API part number 04490, attached to the
manual). Table 6-2 can be used as a basis for taking action as these values change with
time.
The internal data acquisition system (DAS) 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 4.15.2.8 describes APICOM).
Table 6-2: Predictive Uses for Test Functions
FUNCTION EXPECTED ACTUAL INTERPRETATION & ACTION
Fluctuating Developing leak in pneumatic system. Check for leaks
RCEL
pressure
Constant to
within ± 0.5
Slowly increasing
Pump performance is degrading. Replace pump head
when pressure is above 10 in-Hg-A
Fluctuating Developing leak in pneumatic system. Check for leaks
Slowly decreasing Flow path is clogging up. Replace orifice filters
SAMPLE
pressure
Constant within
atmospheric
changes
Slowly increasing
Developing leak in pneumatic system to vacuum
(developing valve failure). Check for leaks
Ozone Flow
Constant to
within ± 15
Slowly decreasing 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.
AZERO
Constant within
±20 of check-out
value
Significantly
increasing
O
3
air filter cartridge is exhausted. Change chemical
NO2 CONC
Constant for
constant
concentrations
Slowly decreasing
signal for same
concentration
Converter efficiency may be degrading. Replace
converter.
NO CONC
Constant for
constant
concentration
Decreasing over time
Drift of instrument response; clean RCEL window,
change O
3
air filter chemical.
6.3. MAINTENANCE PROCEDURES
The following procedures need to be performed regularly as part of the standard
maintenance of the Model T200H/M.
6.3.1. CHANGING THE SAMPLE PARTICULATE FILTER
The particulate filter should be inspected often for signs of plugging or excess dirt. It
should be replaced according to the service interval in Table 9-1 even without obvious
signs of dirt. Filters with 1 µm pore size can clog up while retaining a clean look. We
recommend to handle the filter and the wetted surfaces of the filter housing with gloves
and tweezers. We recommend not to touch any part of the housing, filter element, PTFE
07270B DCN6512