PS-3224
Calibration: See www.pasco.com/calibration
11
013-16057A
For a one-point calibration, you will need one “known standard” with 100% dissolved oxygen saturation.
For a two-point calibration, you will need two “known standards”; one with 100% dissolved oxygen saturation, and
one with 0% dissolved oxygen saturation.
Known Standards (100% dissolved oxygen saturation and 0% dissolved oxygen saturation)
One method for a known standard with 100% dissolved oxygen saturation is to use water-saturated air. Moisten the
sponge inside the end of the Probe Cover (Rubber Boot) with water, and then put the probe into the Probe Cover
for about fifteen minutes. WARNING: Don’t calibrate the sensor if the end of the Sensor Cap is under pressure.
Therefore, do not push the Probe into the Rubber Boot so far that it compresses the water-moistened sponge.
A second method for a known standard with 100% dissolved oxygen saturation is to use air-saturated water.
Connect an air-stone to an air pump, and put the air-stone into water. Allow the air-stone and air pump to run for 10
minutes to make sure that the water is completely saturated.
To make a known standard with 0% dissolved oxygen saturation, dissolve enough sodium sulfite, sodium bisulfite,
or potassium sulfite in 150 milliliters of distilled water such that a small amount of sodium sulfite remains
undissolved in the bottom of the beaker. WARNING: Use the same standard lab safety procedures for handling
sulfite compounds as for handling any chemical compound.
PASCO Capstone Calibration. Remember, see www/pasco.com/calibration
Capstone Calibration Steps
•
Place the Wireless Optical Dissolved Oxygen Sensor into your known standard for 100% dissolved oxygen
saturation (for example, moisten the sponge inside the end of the Probe Cover (Rubber Boot) with water, and
then put the probe into the Probe Cover for about fifteen minutes,)
•
In PASCO Capstone, click the Calibration icon in the Tools palette to open the Calibration panel.
1.
The first step in the Calibration panel says
“Choose the type of measurement you would like
to calibrate:” The default for the sensor is “Satura-
tion”. Click “Next”.
2.
The second step says “Choose the probes you
would like to calibrate now:”.The, Wireless Optical
Dissolved Oxygen Sensor is automatically
selected (if the default measurement is kept).
Move to the third step.
3.
The third step says “Choose the type of calibration
you would like to perform:” Select “
One Standard
(1 point slope)
”. Click “Next”.
4.
NOTE: The first point of calibration is already set,
so the fourth step says (Calibrate the second
point:)
