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Carbon Dioxide Sensor

012-08402A

2

®

Equipment Setup

Calibration Procedure for the Carbon
Dioxide Sensor

Calibration of the CI-6561 Carbon Dioxide Sensor is
not required, as the sensor contains a factory
calibration.  If you wish better accuracy, you may
calibrate the sensor in typical atmospheric conditions
(around 400 ppm).

Note: 

Unlike most 

ScienceWorkshop 

sensors, the

Carbon Dioxide Sensor has a sensor-based calibration
routine.

Perform a single point calibration:

1.

 Go outside and collect a sample of fresh air

(approximately 400 ppm CO

2

).

2.

 Insert the sensor assembly and probe into the

upright sampling bottle.  Be sure the stopper fits
snugly into the neck of the bottle (See Figure 2).

3.

 Bring the sensor/bottle assembly inside and connect

it to a 

ScienceWorkshop

 interface.  Ensure the

interface is turned on and connected to a computer.

4.

 On the top of the Carbon Dioxide Sensor, move the

range switch button to the 10K range position.
(Note: This is the default position.)

5.

 In the DataStudio Setup window, double click on

the CO

Sensor icon (to open the Sensor Properties

dialog); then click on the Measurement tab, and
select the 10K concentration range. Click OK.

6.

 In DataStudio, open a display and click the 

Start

button to observe the carbon dioxide reading.  Wait
at least 90 seconds for the reading to stabilize.

7.

 Press the 

Calibrate 

button on the sensor and hold

for 3 seconds.  The green light will stay on to
indicate calibration has begun.

1.

Use the supplied bottle to collect a sample of
carbon dioxide gas. Insert the sensor probe with
stopper into the bottle.

2. 

  Connect the Carbon Dioxide Sensor to an analog

channel (A, B, or C) on a 

ScienceWorkshop

interface.

3. 

 Open DataStudio.  In the Welcome to DataStudio

window, double click “Create Experiment.”

4.

In the Sensors list of the Experiment Setup
window, click and drag the
Carbon Dioxide Sensor icon
to the same analog channel
(A, B, or C) on the picture
of the interface.

5.

Use the switch on the top of
the sensor to select a
measurement range:
10K: 0 to 10,000 ppm or
100K: 0 to 100,000 ppm.

6.

In the Setup window, double click on the CO

2

Sensor icon, click on the Measurement tab, and
select the concentration range (10K or 100K). The
range is 10K by default. Click OK.

7.

(Optional): To calibrate the sensor, follow the
calibration instructions on this page.

Note: 

To change the sampling rate (rate of data

collection), use the 

Plus 

and 

Minus

 buttons in the

General tab of the Sensor Properties dialog.  The
sampling rate depends on the interface used.  The
default rate is 1 sample/second.  One sampling cycle
occurs every time the green light flashes.  Although
the sample rate of the interface can be set much
higher, the sensor only updates once per second.

8.

To collect data, open a display and click the 

Start

button on the main toolbar.

8.

 Wait approximately one minute.  When the green

light flashes again, calibration is finished.

Figure 1: Range
Switch

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