Teledyne API Model 200A NOX Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
The Power supply module supplies AC and DC power to the rest of the instrument. It consists of
a four output linear DC power supply and a 15 volt switching supply. In addition, it contains the
switching circuitry to drive the DC operated valves and several switched AC loads that operate
the Rx cell, IZS, and molybdenum converter heaters and the ozone generator. The only voltages
not generated in the PSM are the high voltage DC required by the PMT which is generated
inside the sensor module and the high voltage AC used by the ozone generator.
4.2.7 Pump, Valves, Pneumatic System A standard M200A comes with two valves. The NO/NOx valve switches sample gas into the
reaction cell from either the sample inlet port or from the moly converter into the reaction cell.
Periodically, the AutoZero valve shuts off sample flow to the reaction cell to measure the
detector dark signal.
A catalytic scrubber contained in the moly converter assembly removes the ozone present in the
exhaust stream.
If the external pump is selected, This option is not available with the internal pump.
The external Pump Pack includes a vacuum pump and optional charcoal NO2 scrubber. By using
this pump, it is possible to remove a significant source of acoustic noise and vibration from the
immediate area of the analyzer. The pump pack is supplied with 0.25" tube fitting to connect to
the exhaust fitting on the M200A rear panel. See Table 2-2-3 for hook-up information. Plugging
the power cord into an AC outlet turns on the pump pack, see Table 4-4-3.
The internal pump has slightly lower performance specifications, and shorter MTBF, however it
consumes significantly less power, and makes an instrument that has a single chassis. The NO2
scrubber option.
A pump is supplied as standard equipment, however if another pump is used, it must have the
following characteristics:
1. The pump must supply 1 slpm at 5"Hg-A.
2. The ozone scrubber must remove all ozone from the analyzer exhaust.
3. Connect the exhaust (Table 2-2-3) to a pump with <3 m of 1/4" PTFE tubing.
Failure to meet the performance specifications will result in poor analyzer performance, damage
to the pump, damage to the analyzer, and may jeopardize warranty repairs. Teledyne API
strongly recommends that the factory supplied pump be used with the M200A.
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