Ecotech Serinus 44 - Equation 2 - no; Equation 3 - NH Calculation

Serinus 44 User Manual 3.0
Page 22
Note: The chemiluminescence reaction is between O
3
and NO only; not NO
2
or NH
3
.
Photons are emitted by the activated NO
2
*
.
 This reaction releases energy in the form of chemiluminescent radiation, which is filtered by the
optical Bandpass filter and detected by the photomultiplier tube (PMT).
 The level of chemiluminescence detected is directly proportionally to the NO in sample.
 The second path is drawn through a delay loop and the NO
2
to NO converter (NO
X
path) such that
it reaches the reaction cell after the first path measurement period. At which point the NO
X
measurement (the combined concentration of NO and NO
2
) is taken.
 The concentration of NO
2
is calculated by subtracting the NO measurement from NO
X
measurement.
NO
X
= NO + NO
2
or NO
2
= NO
X
– NO
Equation 2 – NO
2
Calculation
 The third path is drawn through the external NH
3
converter (N
X
path) which converts NH
3
into NO
and NO
2
. This passes through an internal NO
2
to NO converter to convert any NO
2
into NO.
 The concentration of NH
3
is calculated by subtracting the NO
X
measurement from N
X
measurement
N
X
= NH
3
+ NO
X
or NH
3
= N
X
– NO
X
Equation 3 – NH
3
Calculation