Calibration process for LiCors 7500s. I calibrated all five LiCors. Calibration included post cal, desiccant change, spot check, zero/span. I used N2 tank which went through a scrubber of Ascarite II and Drierite to give the zero for both CO2 and H20.
Post-Cal conditions were checking zeros, span and dew point. Spans included for CO2 were a bottle of 394.611ppm and 378.867ppm. For H2O I used the Thunder Scientific, humidity chamber, set at 25C at 80%RH. Dew point was equal to 21.31C.
Zero Post-Conditions: Pressure 85.04kPa, Temp=27.3C
Sensor ID |
CO2(umol/mol) |
H2O(mmol/mol) |
CO2 Coeff.(zero/span) |
H2O Coeff.(zero/span) |
|---|---|---|---|---|
0813 |
0.08 |
1.11 |
N/A |
N/A |
1166 |
6.58 |
-1.59 |
0.8896/1.0051 |
0.8583/0.9969 |
1163 |
-7.90 |
0.24 |
0.8709/1.0082 |
0.8510/1.0229 |
1167 |
-3.23 |
-0.15 |
0.8770/1.0207 |
0.8732/0.9986 |
1164 |
-10.80 |
0.43 |
0.8902/1.0233 |
0.8635/1.0008 |
Span Post-Conditions: Column2 is standard 394.611ppm; Column3 is standard 378.867ppm; Column4 is dew point standard 21.31C
Sensor ID |
CO2(ppm) |
CO2(ppm) |
H20(C) |
|
|---|---|---|---|---|
0813 |
----------------------- |
-------------------------- |
-------------------- |
|
1166 |
400.83 |
387.48 |
21.16C |
|
1163 |
389.02 |
373.09 |
22.07 |
|
1167 |
398.17 |
382.72 |
20.93 |
|
1164 |
389.60 |
373.81 |
21.82 |
|
Quick Check after desiccant was changed and ran for overnight. Pressure 82.62kPa, Temp 24.33C
Sensor ID |
CO2(ppm) |
H2O(C) |
CO2(378.867ppm) |
|---|---|---|---|
0813 |
--------------- |
-------------- |
-------------------------- |
1166 |
6.61 |
------------- |
------------------------- |
1163 |
-6.05 |
0.41 |
-------------------------- |
1167 |
-2.35 |
------------- |
--------------------------- |
1164 |
-6.61 |
0.43 |
380.54 |
Zero Calibration: CO2 and H20 were set to zero value.
Sensor ID |
CO2(ppm) |
H20(ppm) |
CO2 Coeff. |
H20 Coeff. |
|---|---|---|---|---|
0813 |
-0.01 |
0.00 |
0.9752 |
0.7374 |
1166 |
-0.03 |
0.00 |
0.8909 |
0.8605 |
1163 |
-0.01 |
0.00 |
0.8698 |
0.8532 |
1167 |
0.01 |
0.00 |
0.8766 |
0.8749 |
1164 |
0.01 |
0.00 |
0.8889 |
0.8662 |
Span Calibration: CO2 was spanned to 394.611ppm; H20 was spanned to dew point 21.31C.
Sensor ID |
CO2(ppm) |
H20(ppm) |
CO2 Coeff. |
H2O Coeff. |
|---|---|---|---|---|
0813 |
394.43 |
21.43 |
0.9936 |
1.0380 |
1166 |
394.43 |
21.44 |
1.0052 |
1.0497 |
1163 |
394.65 |
21.45 |
0.9950 |
1.0211 |
1167 |
394.84 |
21.41 |
1.0049 |
1.0258 |
1164 |
394.56 |
21.42 |
1.0008 |
1.0206 |