Reading number

Theoretical concentration (ppm)

Titration concentration (ppm)

Externally calibrated cell 2443 reading (ppm)

Externally calibrated cell 2444 reading (ppm)

Externally calibrated cell 2445 reading (ppm)

Internally calibrated cell 2447 reading (ppm)

1

1.0

0.7

2.1

1.2

1.3

0.8

2

2.1

1.5

1.6

0.8

3

1.9

1.5

1.6

0.8