Teledyne T200, Operation Manual, Page: 294 / 425

Principles of Operation Teledyne API
– T200 NO/NO2/NOx Analyzer Operation Manual
292
13.2.1.1. VACUUM MANIFOLD
The vacuum created by the analyzer‟s pump is supplied to all of the gas streams for the
T200 analyzer through the vacuum manifold (also called the exhaust manifold).
Figure 13-5. Vacuum Manifold, Standard Configuration
Configurations will vary depending on the optional equipment that is installed. For
example:

An T200 with the optional internal span gas generator installed will add another FT8
connector and orifice assembly to the manifold where the FT28 fitting is shown in
the above drawing.

An optional sample gas dryer will add a Tee-fitting so that two ¼” tubes can be
connected to the same port.
13.2.1.2. SAMPLE GAS FLOW VALVES AND ROUTING
As discussed in Section 13.1, the measurement of NO
x
, NO and NO
2
requires that the
sample gas flow cycles through different routes that include and exclude various
scrubbers and converters. There are several valves that perform this function:

The NO/NO
X
valve directs the sample gas either directly to the reaction cell or
through the unit’s NO
2
converter, alternating every ~8 sec.

The Auto Zero valve directs the sample gas stream to completely bypass the
reaction cell for dark noise measurement once every minute, which is then
subtracted as a measurement offset from the raw concentration signal.
06858E DCN7057