SERVOPRO NOx Analyzers Page
SAMPLING REQUIREMENTS
Filtration
Dust must be eliminated completely in the sample stream. Use filters as necessary. The
final filter must be capable of removing any particles larger than 4 microns.
Condensation
The dew point of the sample gases must be lower than the instrument temperature to
prevent accidental condensation within the instrument. If necessary, bypass the sample
through a dehumidifier to reduce the dew point to 4°C or less. If the sample contains an
acid mist, use an acid mist filter, cooler or similar device to remove all traces of the mist.
Presence of Corrosive Gases
The useful service life of the instrument will be shortened if high concentrations of
corrosive gases such as Cl
2
, SO
2
, F
2
, HCl etc. are present in the sampled gas.
Gas Temperature
When measuring high-temperature gases, make sure that the maximum temperature
rating of the instrument 50 ºC (122ºF) is not exceeded in the Standard analyzer and for
the Heated version the maximum rating of the instrument 100ºC (212ºF) is not exceeded.
Pressure and Flow Rates
The air or oxygen supply entering the instrument is controlled by a proportional flow
electronic pressure controller (EPC). The regulator is factory adjusted for optimal
analyzer performance.
The ozone supply (air or O
2
) air cylinder pressure should be set at approximately 25
PSIG (standard without ozone pump option). The sample entering the instrument is
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