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Hello, and welcome to a quick look at the Oxygen Gas Sensor.
The Oxygen Gas Sensor comes in three parts:
the sensor box, the sensing element, and the cable that connects them.
To get the best results from the sensor I'm going to use the Calibrate button on it to calibrate it.
I'm going to go ahead and go outside with the sample bottle that comes with the sensor,
and collect a nice sample of air--fresh air--and I'm going to trap that using the sensing element.
I'm going to bring it back inside and I'm going to go ahead and connect that to my interface.
I'm going to make sure that I have connected the cable firmly, all the way to the sensor box,
connect that to my interface,
and then connect the cable to my sensing element. I get a nice little snap there as it's going
in to make sure that it's connected all the way.
You'll see immediately on the screen, or in your interface, that you can measure in either
percent oxygen or parts per million.
The calibration actually is in percent oxygen, but it's good for both values. The calibration
is good for both units, depending on which you're using.
Now that we have it connected here, I'm going to go ahead and press my Calibrate button,
and this is going to set the value that it's reading right now in the bottle to 20.9%.
It is normally solid but while it's going through its calibration process it is blinking.
It'll go on anywhere from 30 seconds to a minute as it's getting a good average of the
air that it's seeing inside the bottle here.
Once it has finished blinking, it'll go back to solid to let me know that it has finished
calibrating and it's ready to use.
It has a great range, from 0 to 100 percent oxygen.
This lets you do a variety of biology experiments, including a catalase experiment, photosynthesis, or respiration.
I could actually put samples directly into my sample box here and look at the change
in oxygen over time, if I wanted to.
I can take this outside or I can put this into an enclosed environment and do things
like the photosynthesis experiment. Again, great for biology.
We hope you have a great time with your students.
Don't forget to practice safe science.