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 Interferent 42iQLS
Test Gas Concentration As ppm NO As ppm NO2 As ppm NOx
CO2 5% -0.01 -0.01 -0.02
CO2 15% -0.02 -0.01 -0.03
H2O 3% -0.04 0.02 -0.02
N2O 47 ppm 0.03 -0.01 0.02
CO 50 ppm 0.03 0.00 0.03
SO2 27 ppm 0.00

 

-0.01 -0.01
CH4 50 ppm 0.01 0.01 0.00
HCl 20 ppm 0.02 0.00 0.02
NH3 9 ppm 0.00 0.00 -0.01
Sum of Responses   0.17 0.07 0.16
Span Value   160 128 160
% of Calibration Span   0.11% 0.06% 0.10%
Potential Interferent 42iQHL
Test Gas Concentration As ppm NO As ppm NO2 As ppm NOx
CO2 5% 0.00 0.00 0.00
CO2 15% 0.00 0.00 0.00
H2O 3% 0.03 -0.01 0.01
N2O 47 ppm 0.03 0.00 0.03
CO 50 ppm 0.00 0.02 0.02
SO2 27 ppm 0.00 0.00 0.00
CH4 50 ppm 0.00 0.00 0.00
HCl 20 ppm -0.01 0.09 0.08
NH31 9 ppm 0.01 6.61 6.68
Sum of Responses   0.08 0.12 0.15

Span Value

  160 128 160
% 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 Interferent 43iQHL
Test Gas Concentration As ppm SO2
CO2 5% 0.0
CO2 15% 0.1
H2O 3% 0.0
NO 10 ppm 0.2
NO2 38 ppm 0.0
N2O 47 ppm 0.1
CO 50 ppm 0.1
SO2 100 ppm 100.0
CH4 50 ppm 0.0
HCl 160 ppm 0.0
NH3 9 ppm 0.0
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 Interferent 48iQ
Test Gas Concentration As ppm CO
CO2 5% -0.2
CO2 15% -0.5
H2O 3% 0.2
NO 10 ppm 0.1
NO2 38 ppm -0.1
N2O 10 ppm -0.1
CO 507 ppm 508.0
SO2 27 ppm -0.1
CH4 50 ppm -0.1
HCl 160 ppm 0.0
NH3 9 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 Interferent 410iQHL
Test Gas Concentration As % CO2
CO2 5% 4.8
CO2 15% 15.0
H2O 3% 0.0
NO 10 ppm 0.0
NO2 38 ppm 0.0
N2O 10 ppm 0.0
CO 507 ppm 0.0
SO2 27 ppm 0.0
CH4 50 ppm 0.0
HCl 160 ppm 0.0
NH3 9 ppm 0.0
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.