PASCO ME-8598 Venturi Apparatus - Manual (Page 9)

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M o d e l N o . M E- 8 5 9 8 A p p e n d i x B : F lu i d S u p p l y a n d F l o w R a t e M e a s u r e m e n t O p t io n s
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Air Supply Method 2: Balloon
This method will produce a flow rate of about 0.5 L/s.
Stretch the mouth of the balloon around the rubber stopper. Insert the piece of fluid
tubing into the hole in the stopper. Place the restriction clamp on the tubing. Use a
pump to inflate the balloon through the tubing. Close the clamp to hold the air in the
balloon. Remove the pump, and connect the tubing to the inflow port of the apparatus
(see Figure 7). Open the clamp to start the flow of air.
To measure airflow, connect a spirometer sensor as described below.
Note: Using a pump to inflate the balloon ensures that the air will be relatively dry. A balloon
inflated by mouth will introduce moisture into the apparatus.
Figure 7: Setup for air with a balloon
Airflow Measurement
In this method, a Spirometer sensor measures the airflow rate.
Use the PASCO Spirometer sensor to measure airflow rate. The Spirometer is primary
designed for measuring airflow in and out of a person’s lungs, but works well to mea-
sure the airflow through the Venturi Apparatus.
Insert the rubber stopper into the rubber spirometer tubing, 1 and connect the stopper
to the outflow port of the apparatus. Insert the mouthpiece of the spirometer into the
Included Parts Required
Rubber stopper with hole
Short piece of fluid tubing (about 10 cm)
Restriction Clamp
Other Parts Required
Rubber balloon
Balloon pump (available at party supply stores)
Figure 6: Balloon
pump
Spirometer tubing
Rubber
stopper
Rubber
stopper Spirometer
Airflow
Balloon
To Quad Pressure
channels: 2 3 4
Clamp
1
Fluid
tubing
Included Parts Required
Rubber stopper with hole
Spirometer tubing (15 cm long, 2.5 cm inside diameter)
Other Parts Required Part Number
Spirometer Sensor PS-2152
1 The tubing isolates the
spirometer from turbu-
lence occurring at the
apparatus’s outflow port.