Teledyne T200 Operation Manual page 228

Instrument Maintenance
11.3.12.3. PERFORMING A SAMPLE FLOW CHECK
I
MPORTANT
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Teledyne API – T200 NO/NO

Once the fittings have been wetted with soap solution, do not reapply vacuum
as it will draw soap solution into the instrument and contaminate it.

Do not exceed 15 psi pressure.
5. If the instrument has the zero and span valve option, the normally closed ports on
each valve should also be separately checked.

Connect the leak checker to the normally closed ports and check with soap
bubble solution.
6. If the analyzer is equipped with an IZS Option, connect the leak checker to the Dry
Air inlet and check with soap bubble solution.
7. Once the leak has been located and repaired, the leak-down rate of the indicated
pressure should be less than 1 in-Hg-A (0.4 psi) in 5 minutes after the pressure is
turned off.
8. Clean surfaces from soap solution, reconnect the sample and pump lines and
replace the instrument cover.
9. Restart the analyzer.
Use a separate, calibrated flow meter capable of measuring flows between 0 and
1000 cm³/min to measure the gas flow rate though the analyzer. Do not use the
built in flow measurement viewable from the front panel of the instrument.
This value is only calculated, not measured.
Sample flow checks are useful for monitoring the actual flow of the instrument, as the
front panel display shows only a calculated value. A decreasing, actual sample flow
may point to slowly clogging pneumatic paths, most likely critical flow orifices or
sintered filters. To perform a sample flow check:
1. Disconnect the sample inlet tubing from the rear panel SAMPLE port.
2. Attach the outlet port of a flow meter to the sample inlet port on the rear panel.

Ensure that the inlet to the flow meter is at atmospheric pressure.
3. The sample flow measured with the external flow meter should be 500 cm³/min ±
10%.

If a combined sample/ozone air dryer is installed (optional equipment), the flow
will be 640 cm³/min ± 10% (500 cm³/min for the sample and 80 cm³/min for the
ozone generator supply air and 60 cm³/min for the purge flow).

Low flows indicate blockage somewhere in the pneumatic pathway.
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I R
MPACT ON EADINGS OR
/NO Analyzer Operation Manual
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ATA
06858E DCN7057