Servicing Critical Flow Orifices; Figure 5-12. Critical Flow Orifice Assembly - Teledyne T200 User Manual

8. Do not remove the sample and ozone nozzles. They are Teflon threaded and
require a special tool for reassembly. If necessary, the manifold with nozzles
attached can be cleaned in an ultrasonic bath.
9. Reassemble in proper order and re-attach the reaction cell to the sensor
housing. Reconnect pneumatics and heater connections, then re-attach the
pneumatic sensor assembly and the cleaning procedure is complete.
10. After cleaning the reaction cell, it is also recommended to exchange the ozone
supply air filter chemical as described in Section 5.6.3.
11. After cleaning, the analyzer span response may drop 10 - 15% in the first 10
days as the reaction cell window conditions. This is normal and does not require
another cleaning.
S
ERVICING
There are several critical flow orifices installed in the analyzer (see Figure 6-7 for a
pneumatic location of each orifice). Despite the fact that these flow restrictors are protected
by sintered stainless steel filters, they can, on occasion, clog up, particularly if the
instrument is operated without sample filter or in an environment with very fine, sub-
micron particle-size dust.
126 Teledyne API T200 NO/NO
C F O
RITICAL LOW RIFICES

Figure 5-12. Critical Flow Orifice Assembly

/NO Analyzer with NumaView™ Software
2 x
083730200A DCN7962