Ecotech Serinus 44 - 5.7 NO2 to NO Converter Efficiency

Calibration
Page 101
Figure 47 – Multipoint Calibration Results Example
If unsatisfactory results are observed, please refer to Section 7 - troubleshooting.
5.7 NO
2
to NO Converter Efficiency
The efficiency of the NO
2
to NO converter can impact readings and may degrade over time. The
converter efficiency must be measured to ensure the efficiency is 96% or greater and to compensate
for converter inefficiencies impacting results.
In the S44 there are two NO
2
to NO converter coils and both of these needs to be tested on a regular
basis (refer to Section 1.5.8).
Standard Error of Y about X must be less than 1% of FS value for both NOx and Nx channels.
Zero
0.4
5.00
3000
0.1
299.4
1.0
100.2
3000
3000
20% FS
40% FS
60% FS
80% FS
399.2
0.5
0.2
100
199
299
397
0.00
100.0
199.0
299.0
397.0
0.0
3000
400.0
1.0
Measured
NH3
0.5
0.4
0.5
0.9
0.8
0.5
3000
PASS/
FAIL
PASS
Note: Do not fill in the shaded cells
NOx
Nx
Standard error (Y about X)
0.87
0.92
Error as %FS
0.17%
0.18%
Multipoint Linearity Check (NO gas)
0.00
Expected
NOx (ppb)
0.0
Calculated
NOx (ppb)
Cal. Point
Zero
Span flow
(sccm)
0.00
Measured
NO
3000
Zero flow
(sccm)
10.00
15.00
99.6
198.0
299.0
0.5
Measured
NOx
0.5
99.8
198.6
0.6
0.4
Measured
Nx
199.1
300.3
0.00
20.00
399.0
Measured
NO2
0.0
0.2
y = 1.004x + 0.4383
R² = 1
y = 1.003x + 0.0011
R² = 1
0
50
100
150
200
250
300
350
400
450
0 50 100 150 200 250 300 350 400 450
Measured Concentration
Expected Concentration
NX
NOx
Linear (NX)