Data Harvest SmartQ 3266 Schnellstart-Handbuch - Seite 7
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Divide the number of drops by the volume (in cm
272 drops fill a capacity of 10 mls = 27.2 drops/cm
three times to get an average value.
To convert logged Drop/Bubble Count data to Volume, first calculate the number of drops
3
in a cm
. Select Post-log Function from the Tools menu. Select Preset function, Titration,
Convert Drops to Volume, Next. Select the Drop/Bubble Count channel of data, Next. Enter
the volume of a single drop into parameters and increase the number of decimal places as
appropriate, Finish.
Using the Drop / Bubble Counter to count bubbles
The Smart Q Drop / Bubble Counter can be used to detect a bubble formed in a column of
water. The column of water should be positioned between the Counters receiver and emitter
so it blocks the infrared beam. When a bubble rises the beam is momentarily changed and a
bubble is counted.
Bubbles cannot be calibrated for volume but can be used to show the change of gas
production over time.
Test your set up before beginning the experiment. It is critical that the column of fluid is
positioned so the bubbles will change the beams level as they rise. Bubble counting is not an
exact science. Bubbles have an inconsistent format and can move through the fluid in an
erratic manner; they need to rise separately from the same origin to be counted.
Note: Small, fine bubbles such as those produced by oxygenating pond weed are unlikely to be
detected.
Reagent reservoir
Bottom of reservoir aligned
with the bottom of the
emitter moulding
Note: The reservoir is positioned up against the emitter
Set the range of the Counter to Drop/Bubble Count, see page 3.
Set up the column of fluid for the bubbles to rise through.
The reagent reservoir can be used as a vessel for counting bubbles. Connect a length of
PVC tubing (3 mm inside diameter) from the reservoir to a stopcock attached to the delivery
tube on the apparatus. Turn the stopcock to a closed position.
Clamp the Counter vertically.
Emitter
7
Drop / Bubble Counter
3
) to get the drops per cm
3
. Top up the reservoir and repeat
Light beams path
Receiver
3
value e.g.
3-way stopcock
Hydrogen
Peroxide
Potato