PASCO Specialty & Mfg. SE-9790 User's Manual
Contents
1. Connect part E to part H 2 3 Connect part F to part E 4 Connect the syringe to the T of part F 5 Connect the Absolute Pressure Sensor to the T on part H Plug the Pressure Sensor into analog channel A on your Science Workshop computer interface CEA Pressure Sensor Figure 4 Setup with the Pressure Sensor and a ScienceWorkshop computer interface PASC ON selentitie Student Bell Jar Monitoring the Interior Air Pressure After you have completed the setup that has just been described set the Pressure Sensor up in your data acquisition software Science Workshop or DataStudio and open a Graph display When you are ready to start pulling the vacuum start collecting data Maintenance Bell Jar and O ring The bell jar and O rings should be kept clean free of dust e Use mild dishwashing soap and water to clean AN Cautions Do not use abrasives e Do not use organic chemicals Note on the o rings or connectors and use of it will attract dust and dirt Vacuum grease should not be necessary Syringe e Glycerin may be used on the plunger but normally no lubricant is required A Caution e Do not use any petroleum based lubricant on the syringe The plunger is very intolerant to petroleum based substances Student Bell Jar Safety Considerations This set is intended to be used by teachers and their students while working under appropriate supervision2. workmanship for a period of one year from the date of shipment to the customer PASCO will repair or replace at its option any part of the product which is deemed to be defective in material or workmanship The warranty does not cover damage to the product caused by abuse or improper use Determination of whether a product failure is the result of a manufacturing defect or improper use by the customer shall be made solely by PASCO scientific Responsibility for the return of equipment for warranty repair belongs to the customer Equipment must be properly packed to prevent damage and shipped postage or freight prepaid Damage caused by improper packing of the equipment for return shipment will not be covered by the warranty Shipping costs for returning the equipment after repair will be paid by PASCO scientific Address PASCO scientific 10101 Foothills Blvd Roseville CA 95747 7100 Phone 916 786 3800 FAX 916 786 8905 e mail techsupp pasco com Web site www pasco com Note This instruction sheet was written assuming that the user is familiar with ScienceWorkshop or DataStudio Users can gain familiarity by working through the tutorials provided with Science Workshop or from DataStudio s Online Help
3. Generally Please teach and expect safe behavior in your classroom and lab Safety considerations call for supervision of students at all times use of safety eyeware no horseplay no unauthorized experimentation immediate reporting to the instructor of accidents or breakage among others More Specifically Any liquids entering the pump are apt to be discharged as a mist or spray Only safe liquids such as water should be allowed to be used in association with the pump and safety eyeware is definitely required The bell jar should be used only with the bottom plate furnished Attempting to evacuate the chamber while in contact with other surfaces could cause damage Severe injury will result from evacuating the chamber while in contact with skin Do not put items in the bell jar that would be damaged by or cause damage as a result of reduced pressure Examples would include sealed containers wrist watches batteries etc Certainly animals should not be placed in the bell jar for reasons of law and human decency Do not use the apparatus if the bell jar or bottom plate have become cracked or otherwise damaged The exclamation point within an equilateral triangle is intended to alert the user of important operating and safety instructions that will help prevent damage to the equipment or injury to the user 012 07194A Limited Warranty PASCO scientific warrants the product to be free from defects in materials and
4. Instruction Sheet for the PASCO Model SE 9790 012 07194A 08 99 1 00 STUDENT BELL JAR in G A g A z ge B Introduction Equipment The PASCO SE 9790 Student Bell Jar INCLUDED demonstrates the effect of air pressure on the Part Label Part Name boiling point of a liquid on the size of a balloon A bell jar top with connector on the size of a marshmallow and on the holding B bell jar bottom with O ring power of a suction cup It also demonstrates that c aaie cap air has mass D suction cup The syringe and one way check valve system E tubing with check valve constitute an inexpensive vacuum pump F tubing with T and check valve G 60 cc syringe An extra connector is provided to permit the H tubing for connection with a Student Bell Jar to be connected to a PASCO Pressure Sensor Absolute CI 6532 or Differential CI 6533 allowing the monitoring of the pressure inside the chamber 1999 PASCO scientific PASCO Pressure Sensor I balloon Note Parts E F and G constitute the vacuum pump ADDITIONAL SUGGESTED e ScienceWorkshop Interface 300 500 700 or 750 e computer and data acquisition software ScienceWorkshop or DataStudio PASC Ci scientific 10101 Foothills Blvd o Roseville CA 95747 7100 Phone 916 786 3800 FAX 916 786 8905 www pasco com Student Bell Jar Basic Setup and Operation egiten Figure 1
5. T Assembling the vacuum pump 1 Assemble the vacuum pump as shown in Figure 1 2 Attach part E to the connector on the top of the bell jar Twist to secure the connection Figure 2 NE Figure 2 Attaching the vacuum pump to the bell jar 3 Do one of the following e Place the balloon on the base of the bell jar e Place a large fresh marshmallow on the base of the bell jar 012 07194A e Press the suction cup onto the base of the bell jar e Half fill the plastic cup with very hot coffee and place it on the base of the bell jar Figure 3 4 Put the lid on the bell jar hold it there firmly and pump the piston of the syringe 10 to 15 times Result e the balloon will expand e the marshmallow will expand e the suction cup will fall off e the coffee will boil Suggestion For the coffee boiling experiment measure the coffee temperature before and after it boils Figure 3 Completed setup for the coffee boiling demonstration To Determine the Weight of Air 1 Find and record the original combined mass of parts A B and E 2 Evacuate the chamber and disconnect A from E 3 Find and record the resulting combined mass of parts A B and E 4 Subtract the resulting combined mass from the original combined mass to find the mass of air in the bell jar Aa e en 012 07194A Setup to Monitor the Interior Air Pressure 1 Connect part H to the hose connector on part A Figure 4
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