Performing Flow Checks/Calibrations - Teledyne T200 User Manual

4. Pressurize the instrument with the leak checker or tank gas, allowing enough
time to fully pressurize the instrument through the critical flow orifice.
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5. If the instrument has the zero and span valve option, the normally closed ports
on each valve should also be separately checked.
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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.

PERFORMING FLOW CHECKS/CALIBRATIONS

Important
The rates of sample gas flow and O
NO and NO
by the CPU. The Flow Cal and Ozone Flow Cal features under the Utilities>Diagnostics
menu are used to check and to calibrate/adjust these calculations.
Such checks are useful for monitoring the actual flow of the instrument, using an external
flow meter. A decreasing, actual sample flow may point to slowly clogging pneumatic
paths, most likely critical flow orifices or sintered filters (Section 5.6.9).
130 Teledyne API T200 NO/NO
Check each tube connection (fittings, hose clamps) with soap bubble
solution, looking for fine bubbles.
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.
Connect the leak checker to the normally closed ports and check with soap
bubble solution.
IMPACT ON READINGS OR DATA
Use a separate, calibrated flow meter capable of measuring the
flow specifications for the instrument being checked/calibrated
in order to get accurate measurements. Do not use the built in
flow measurement viewable in the Dashboard. This value is only
calculated, not measured.
flow through the analyzer are a key part of the NO
3
concentration readings, but the readings are only calculated values derived
2
/NO Analyzer with NumaView™ Software
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083730200A DCN7962