To better assist our customers to meet the requirements of the Instrumental Methods for testing 3A, 6C, 7E, 10, and 20, we are providing a summary of interferences for certain Thermo Fisher Scientific analyzers.

The information contained in the tables pertains to the “make” of analyzers under the name of: Thermo Electron Corporation, Thermo Environmental Instruments and Thermo Scientific. The gas analyzer models are: 42iQLS and 42iQHL for NO, NO2, NOx; 43iQHL for SO2; 48iQ for CO and 410iQ for CO2. The specific pollutant detection and analytical technology for each of the above listed specific models have remained the same for various series of analyzers manufactured over the past years. Therefore, the interference test results shown for the iQ Series analyzers in this document would produce essentially the same results for iSeries and earlier series of these models.

 

Thermo Scientific 42iQLS & 42iQHL NO-NO2-NOX Analyzer 
Potential Interferent Gas Responses

Potential Interferent42iQLS
Test GasConcentrationAs ppm NOAs ppm NO2As ppm NOx
CO25%-0.01-0.01-0.02
CO215%-0.02-0.01-0.03
H2O3%-0.040.02-0.02
N2O47 ppm0.03-0.010.02
CO50 ppm0.030.000.03
SO227 ppm0.00

 

-0.01-0.01
CH450 ppm0.010.010.00
HCl20 ppm0.020.000.02
NH39 ppm0.000.00-0.01
Sum of Responses 0.170.070.16
Span Value 160128160
% of Calibration Span 0.11%0.06%0.10%
Potential Interferent42iQHL
Test GasConcentrationAs ppm NOAs ppm NO2As ppm NOx
CO25%0.000.000.00
CO215%0.000.000.00
H2O3%0.03-0.010.01
N2O47 ppm0.030.000.03
CO50 ppm0.000.020.02
SO227 ppm0.000.000.00
CH450 ppm0.000.000.00
HCl20 ppm-0.010.090.08
NH319 ppm0.016.616.68
Sum of Responses 0.080.120.15

Span Value

 160128160
% of Calibration Span 0.05%0.09%0.09%

Note: Acceptance criterion based on Section 13.4 of Method 7E, states that the sum of the responses must not be greater than 2.5% of the analyzer calibration value.

1NH3 interferent results shown for the 42iQHL was not used in the calculation of the interferent response check because it is a known interferent with an approximate 1 ppm to 1 ppm positive bias in analyzers using stainless steel NO2 to NO converters. Thermo Scientific recommends that NOx analyzers with stainless steel NO2 to NO converters must use a NH3 scrubber when testing sources with potential NH3 in the flue gas.

 

Thermo Scientific 43iQHL SO2 Analyzer 
Potential Interferent Gas Responses

Potential Interferent43iQHL
Test GasConcentrationAs ppm SO2
CO25%0.0
CO215%0.1
H2O3%0.0
NO10 ppm0.2
NO238 ppm0.0
N2O47 ppm0.1
CO50 ppm0.1
SO2100 ppm100.0
CH450 ppm0.0
HCl160 ppm0.0
NH39 ppm0.0
Sum of Responses 0.450
Span Value 100
% of Calibration Span 0.45%

Note: Acceptance criterion based on Section 13.4 of Method 7E, states that the sum of the responses must not be greater than 2.5% of the analyzer calibration value.

 

Thermo Scientific 48iQ CO Analyzer 
Potential Interferent Gas Responses

Potential Interferent48iQ
Test GasConcentrationAs ppm CO
CO25%-0.2
CO215%-0.5
H2O3%0.2
NO10 ppm0.1
NO238 ppm-0.1
N2O10 ppm-0.1
CO507 ppm508.0
SO227 ppm-0.1
CH450 ppm-0.1
HCl160 ppm0.0
NH39 ppm-0.1
Sum of Responses 1.6
Span Value 507
% of Calibration Span 0.32%

Note: Acceptance criterion based on Section 13.4 of Method 7E, states that the sum of the responses must not be greater than 2.5% of the analyzer calibration value.

 

Thermo Scientific 410iQHL CO2 Analyzer 
Potential Interferent Gas Responses

Potential Interferent410iQHL
Test GasConcentrationAs % CO2
CO25%4.8
CO215%15.0
H2O3%0.0
NO10 ppm0.0
NO238 ppm0.0
N2O10 ppm0.0
CO507 ppm0.0
SO227 ppm0.0
CH450 ppm0.0
HCl160 ppm0.0
NH39 ppm0.0
Sum of Responses 0.02
Span Value 15
% of Calibration Span 0.12%

Note: Acceptance criterion based on Section 13.4 of Method 7E, states that the sum of the responses must not be greater than 2.5% of the analyzer calibration value.

UX DATA-TRKR Retired - Admins, feel free to remove this reference component.