Teledyne T200 Operation Manual page 241

Teledyne API – T200 NO/NO
12.4.1.2. OZONE FLOW IS ZERO OR LOW
06858E DCN7057
/NO Analyzer Operation Manual
2 X

If there is no flow or low flow, continue with the next step.
2. Check pressures.

Check that the sample pressure is at or around 28 in-Hg-A at sea level (adjust
as necessary when in elevated location, the pressure should be about 1" below
ambient atmospheric pressure) and that the RCEL pressure is below 10 in-Hg-A.

The T200 will calculate a sample flow up to about 14 in-Hg-A RCEL pressure
but a good pump should always provide less than 10 in.

If both pressures are the same and around atmospheric pressure, the pump
does not operate properly or is not connected properly. The instrument does
not get any vacuum.

If both pressures are about the same and low (probably under 10 in-Hg-A, or
~20" on sample and 15" on vacuum), there is a cross-leak between sample flow
path and vacuum, most likely through the dryer flow paths. See troubleshooting
the dryer later in this chapter.

If the sample and vacuum pressures are around their nominal values (28 and
<10 in-Hg-A, respectively) and the flow still displays XXXX, carry out a leak
check as described in Section 13.3.12.

If gas flows through the instrument during the above tests but goes to zero or is
low when it is connected to zero air or span gas, the flow problem is not internal
to the analyzer but likely caused by the gas source such as
calibrators/generators, empty gas tanks, clogged valves, regulators and gas
lines.

If an IZS or Zero/Span valve option is installed in the instrument, press CALZ
and CALS. If the sample flow increases, suspect a bad Sample/Cal valve.
3. If none of these suggestions help, carry out a detailed leak check of the analyzer as
described in Section 11.3.12.2.
If there is zero or a low (<50 cm³/min) ozone flow, the unit displays an OZONE FLOW
WARNING message on the front panel and a value between 0.0 and 50 cm³/min for the
actual ozone flow as measured by the internal mass flow meter. In this case, carry out
the following steps:
1. Check the actual flow rate through the ozone dryer by using an external flow meter
to the inlet port of the dryer.

This inlet port is inside the analyzer at the end of the plastic particle filter
(Section 11.3.2 for illustration).

If there is nominal flow (about 160 cm³/min from 80 cm³/min O
cm³/min purge flow), consult customer service as there is a problem with the
firmware or electronics.
2. If the actual flow is low or zero, check if the pump operates properly. The RCEL
pressure should be below 10 in-Hg-A at sea level.

If it is above 10", rebuild the pump (Section 11.3.4.1). Check the spare parts list
in Appendix B on how to order pump rebuild kits.
3. Check if the particle filter is clogged.

Briefly remove the particle filter to see if this improves the flow.
Troubleshooting & Service
flow and 80
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