Serinus 44 User Manual 3.0
14. Open - Main Menu Calibration Menu.
15. Edit - Conv. Efficiency NO2 - (change back to original efficiency) - Accept.
16. Edit - Conv. Efficiency NH3 - (change back to original efficiency) - Accept.
17. Remove the bypass loop and reconnect the external converter.
5.7.2 Multipoint NO
2
to NO Converter Efficiency Adjustment
A multipoint converter efficiency check is performed to determine the actual converter efficiency
across the range of the instrument. The instrument is then adjusted accordingly.
In the S44, the Conv. Efficiency NO2 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
path in conjunction with the external converter and other losses throughout the
instrument make up the Conv. Efficiency NH3. Therefore the NH
3
efficiency should not be adjusted
as part of this procedure.
Note: For the following procedure the results for the NH
3
and N
X
channels can be ignored; bypassing
the NH
3
converter is not required.
Equipment Required
Gas Dilution Calibrator which can perform a Gas Phase Titration (GPT) (such as a Serinus Cal
2000/3000) with ozone.
NO gas cylinder reference standard.
Zero Air Generator.
Procedure
1. Open - Main Menu Calibration Menu.
2. Note down the current values for Conv. Efficiency NO2.
3. Edit - Conv. Efficiency NO2 - (change to 100%) - Accept.
4. Supply the instrument with zero air from your gas dilution calibrator.
5. Allow the instrument to achieve a prolonged, stable measurement response and note down the
NO, NO
2
and
N
X
values for reference only. If you get greater than 3 to 5 ppb you need to
troubleshoot the instrument and calibration system before continuing with this procedure.
6. Supply the instrument with NO span gas at a concentration of 80% of the full-scale monitoring
range of the particular instrument.
7. Allow the instrument to achieve a prolonged, stable measurement response and note down the
NO, NO
2
and
N
X
values. Label them as [NO]
ORIG
, [NO
2
]
ORIG
and [N
X
– NO]
ORIG
after you perform the
calculation of N
X
– NO.
8. Without changing the previous span concentration, turn on the O
3
generator in the GPT system,
and react the NO and O
3
to produce NO
2
. The O
3
concentration should be no more than 80% of
the supplied NO concentration; there should still be excess un-reacted NO measured by the
instrument.
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