Table 13-1: List Of Interferents - Teledyne T200 Operation Manual

Principles of Operation

Table 13-1: List of Interferents

Gas
Dilution: Viscosity of CO
collect in aperture of Critical Flow Orifice altering flow
rate of NO.
CO
2
rd
3 Body Quenching: CO
NO * molecules absorbing excess energy kinetically
2
and preventing emission of photons.
Some SO variants can also initiate a
X
chemiluminescence reaction upon exposure to O
producing excess light.
Chemically reacts with NH
generator to create (NH
and NH NO
3
white deposits on optical filter window. Also forms
SO
X
highly corrosive HNO
rd
3 Body quenching: SO
molecules absorbing excess energy kinetically and
preventing emission of photons.
rd
3 Body quenching: H
molecules absorbing excess energy kinetically and
preventing emission of light.
Water also reacts with NH
H O
2
generator to create (NH
and NH NO
3
white deposits on the optical filter window. This also
forms highly corrosive HNO
Direct Interference: NH
by the NO converter. Excess NO reacts with O
2
the reaction cell creating a chemiluminescence
artifact.
NH
NH also reacts with H
3
3
generator to create (NH
and NH NO
3
white deposits on optical filter window. Also forms
highly corrosive HNO
13.1.5.4. REACTION CELL TEMPERATURE CONTROL
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Teledyne API – T200 NO/NO2/NOx Analyzer Operation Manual
Interference Type
molecules causes them to
2
molecules collide with
2
, O and H O in O
3 2 2
) SO (ammonium sulfate)
3 2 4
(ammonium nitrate) which form opaque
2
(Nitric Acid)
3
molecules collide with NO
X
O molecules collide with NO
2
and SO in the O
3 X
) SO (ammonium sulfate)
3 2 4
(ammonium nitrate) which form opaque
2
(nitric acid)
3
is converted to H
3
O, O and SO
2 2 X
) SO (ammonium sulfate)
3 2 4
(ammonium nitrate) which form opaque
2
(nitric acid).
3
The stability of the chemiluminescence reaction between NO and O
changes in the temperature and pressure of the O
In order to reduce temperature effects, the reaction cell is maintained at a constant
50 C, just above the high end of the instrument‟s operation temperature range.
Two AC heaters, one embedded into the bottom of the reaction cell, the other embedded
directly above the chamber‟s exhaust fitting, provide the heat source. These heaters
operate off of the instrument‟s main AC power and are controlled by the CPU through a
power relay on the relay board (see Section 13.3.4.4).
A thermistor, also embedded in the bottom of the reaction cell, reports the cell‟s
temperature to the CPU through the thermistor interface circuitry of the motherboard
(see Section 13.3.3.3).
If high concentrations of CO
special calibration methods must be performed to
account for the affects of the CO
Contact Teledyne API's Customer Service
Department (see Section 12.10) for details.
Wavelengths of light produced by
chemiluminescence of SO
3
the Optical Filter.
3
Most of the ammonium sulfate and ammonium
nitrate produced is removed from the sample gas
by an air purifier located between the O
Generator and the reaction cell.
If high concentrations of SO
special calibration methods must be performed to
*
2
account for the affects of the SO
Contact Teledyne API's Customer Service
Department (see Section 12.10) for details.
* Analyzer's operating in high humidity areas must
2
have some drying applied to the sample gas (see
Section 3.3.2.6 for more details).
Water is effectively removed from the O
3
stream by the Sample Dryer (Section 13.2.3.2 for
more details). We offer several Sample dryers
for the sample stream (see Section 3.3.2.6 for
more details).
O and NO If a high concentration of NH
2
in must be taken to remove the NH
3
gas prior to its entry into the NO
Section 3.3.2.6 for more details).
in the O
3
The Sample dryer built into the T200 is sufficient
for removing typical ambient concentration levels
of NH .
3
Rejection Method
are suspected,
2
.
2
are screened out by
X
are suspected,
X
.
2
is suspected, steps
3
from the sample
3
converter (see
2
can be affected by
3
and sample gases in the reaction cell.
3
06858E DCN7057
3
gas
3