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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 Values(zero/span)

H2O Values(zero/span)

0813

0.08

1.11

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 Value

H20 Value

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 Value

H2O Value

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

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