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Teledyne API - Model 200EH/EM Operation Manual Troubleshooting & Repair
269
11.6.4. SAMPLE AND OZONE DRYER REPLACEMENT
The M200EH/EM standard configuration is equipped with a dryer for the ozone supply air. An optional dryer is
available for the sample stream and a combined dryer for both gas streams can also be purchased. To change
one or all of these options:
1. Turn off power to the analyzer and pump, remove the power cord and the analyzer cover.
2. Locate the dryers in the center of the instrument, between sensor and NO
2
converter.
They are mounted to a bracket, which can be taken out when unscrewing the two mounting screws (if
necessary).
3. Disconnect all tubing that extends out of the dryer assembly,
These are usually the purge tube connecting to the vacuum manifold, the tube from the exit to the
ozone flow meter (ozone dryer) or to the NO/NO
x
valve (sample dryer) or two tubes to the ozone flow
meter and the NO/NO
X
valve (combo-dryer).
Take extra care not to twist any of the white plastic fittings on the dryer, which connect the inner
drying tube to the outer purge tube. See Section 9.3.2 and Figure 9-2.
4. Note the orientation of the dryer on the brac
ket.
5. Cut the tie wraps that hold the dryer to the mounting bracket and take out the old dryer.
If necessary, unscrew the two mounting screws on the bracket and take out the entire assembly.
6. Attach the replacement dryer to the mounting bracket in the same orientation as the old dryer.
7. Fix the dryer to the bracket using new tie wraps.
8. Cut off excess length of the wraps.
9. Put the assembly back into the chassis and tighten the mounting screws.
10. Re-attach the tubes to vacuum manifold, flow meter and/or NO/NO
x
valve using at least two wrenches.
Ttake extra care not to twist the dryer’s white plastic fittings, as this will result in large leaks that are
difficult to trouble-shoot and fix.
11. Carry out a detailed leak check (Section 0),
12. Close the analyzer.
13. Power up pu
mp and analyzer and re-calibrate the instrument after it stabilizes
04521C (DCN5731)