Serinus 44 User Manual 3.0
The NO
2
converter efficiency value displayed in the Main Menu Service Menu Calculation
Factors menu only applies to the NO
X
path converter coil, the efficiency of the second coil for the N
X
channel is encompassed in the NH
3
converter efficiency value.
The following procedures describe the process for testing the efficiency for both converter coils and
adjusting the NO2 converter efficiency for the NO
X
channel coil.
Required Equipment
Gas Dilution Calibrator which can perform a Gas Phase Titration (GPT) (such as a Serinus Cal
2000/3000) with ozone.
A NO gas cylinder reference standard
Zero Air Generator
Loop of tube (to bypass external converter)
To measure and correct converter efficiency the following equation is used:
Equation 4 – Calculation for NO
2
Converter Efficiency of the NO
X
path
= NO
2
measurement obtained by running a stable concentration of NO span gas through
the instrument.
= NO measurement obtained by running a stable concentration of NO span gas through
the instrument.
= NO measurement obtained by running a stable concentration of NO
2
span gas (as
generated by reacting O
3
with NO in a GPT calibrator) through the instrument.
= NO
2
measurement obtained by running a stable concentration of NO
2
span gas (as
generated by reacting O
3
with NO in a GPT calibrator) through the instrument.
To assess the converter efficiency for the N
X
coil the following equation is used:
Equation 5 – Calculation for NO2 Converter Efficiency of the NX path
= Calculation of the N
X
measurement minus the NO measurement, obtained by
running a stable concentration of NO span gas through the instrument.
= NO measurement obtained by running a stable concentration of NO span gas through
the instrument.
= Calculation of N
X
measurement minus the NO measurement, obtained by running
a stable concentration of NO
2
span gas (as generated by reacting O
3
with NO in a GPT calibrator)
through the instrument.
= NO measurement obtained by running a stable concentration of NO
2
span gas (as
generated by reacting O
3
with NO in a GPT calibrator) through the instrument.
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