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Apparatus and Supplies
Pumps, Vacuum, continued
Vacuum Pump, Single-Stage
Lowmaintenance, economical, singlestage vacuum pump is fast and easy to operate. Oilless operation produces a moderate vacuum of 150 mm Hg (1⁄5 normal pressure). It can also push a pressure of 3,192 mm Hg, which is 4.2 times normal room pressure. Other speci fications include 31 liters/min. open flow, motor speed of 1725 rpm, 1⁄8 hp, gauges, on/off switch on cord, carrying handle, rubber feet, 115 V, 60 Hz, 15 lbs. net weight. Accepts 1⁄4" i.d. tubing.
Note: For the classic Boil Water in a Bell Jar experiment, we recommend using the Two-Stage Vacuum Pump, Catalog No. AP1597.
Vacuum Pump, Two-Stage
The most durable twostage pump you can buy. This quiet, dependable vacuum pump will produce a highquality vacuum when performing experiments in which a very low pressure is needed, like boiling water at room temperature. The rotary sliding vane produces a free air capac ity of 85 liters per minute. Other features/specifications include: direct drive; oil trap; pump speed of 3360 rpm; 1⁄2hp, 110V, 60 Hz motor; oil capacity of 300 mL; and two intake ports for 1⁄4" or 1⁄2" i.d. tubing. Weighs 30 lbs and dimensions are 11" H x 14" L x 51⁄4" W; 1pint bottle of highviscosity pump oil included. Contact Flinn Scientific for free demonstration instructions and activities.
See free video at flinnsci.com.
Pumps, Vacuum, Accessories
Buzzer in a Vacuum
Students are always perplexed when asked, “Do sound waves travel in a vacuum?” Demonstrate this concept with the Buzzer in a Vacuum device. The buzzer operates on a DC power source. Turn the power on, and it buzzes loudly. Connect a vacuum pump to the jar assembly and turn on the pump. As air is pumped out of the jar, the sound of the buzzer becomes fainter. When all the air is removed, you can barely hear the sound. Slowly allow air to reenter the jar and the sound of the buzzer becomes stronger. Requires 1⁄4" tubing. Vacuum pump available separately.
PUMPS, VACUUM, ACCESSORIES continued on next page.
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188
Vacuum Pump, Single-Stage AP1712
Catalog No.
Description
Price/Each
AP1712
Vacuum Pump, Single-Stage
$664.65
AP8789
Vacuum Tubing, 10 feet
26.75
Catalog No.
Description
Price/Each
AP1597
Vacuum Pump, Two-Stage
$808.55
AP1598
Pump Oil, quart
18.35
AP8789
Vacuum Tubing, 10 feet
26.75
AP5353
Valve, Three-Way
48.10
Vacuum Pump, Two-Stage AP1597
Buzzer in a Vacuum AP4532
Catalog No.
Description
Price/Each
AP4532
Buzzer in a Vacuum
$77.10
Vacuum Pump
• Place strips of masking tape or electrical tape up, down and around any vessel you use under reduced pressure.
• Always provide a relief valve of some kind to enable the slow release of vacuum.
• A false conclusion is that the vacuum produced by a water aspirator will not create a collapsing force, but a water aspirator may create a collapsing force
equal to 80% of that produced by a vacuum pump.
• Do not pry a bell jar away from the vacuum base. Slide the bell jar from side to side while lifting.
• Never evacuate soft glass bottles or flat flasks. Apply a vacuum only to vessels designed for vacuum application (e.g., heavywalled filter flasks).
• Avoid evacuating vessels larger than 2 liters unless the vessel is placed behind a safety shield.
• Inspect all glassware to make sure it is free of cracks, chips, scratches or breaks.
Safety Tip
