Vacuum Pump

Vacuum Pump

  • Welch 2581B

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Reliable WOB-L Piston pump is perfect for many common laboratory vacuum applications. Features: Vacuum to 5 Torr (29.8"Hg). Includes Vacuum Regulator and Gauge - simple to adjust and monitor vacuum level. Inlet Water Trap - float ball rises to seal off pump from accidental ingestion of water. Muffler quiets pump and filters discharge air. For use with dry or aqueous vapor applications only.
 

Features
  • Economical
  • Oil Free
  • Adjustable Vacuum

 

Product Family Specifications
Model25112522253425462561256725812585
ApplicationsFiltration, Aspiration, Desiccation, Replace water aspirator, Vacuum Drying,Filtration (1 to 2 funnels),Aspiration, Desiccation, SPE, Replace water aspirator, Vacuum DryingFiltration (1 to 4 funnels),Aspiration, Desiccation, SPE, Replace water aspirator, Vacuum DryingFiltration (1 to 6 funnels),Aspiration, Desiccation, SPE, Replace water aspirator, Vacuum DryingVacuum Ovens less than 2 ft3 (57 liters); Vacuum filtration up to 6 funnelsVacuum filtration up to 6 funnel manifold; Lab automation - aspiration of systems utilizing 96 / 256 well format; Welchnet lab installations up to 10 outlet fixtures (geneneral use, filtration)Vacuum Ovens 2 to 4.5 ft3 (57 to 127 liters); Glove Box transfer chamber and purge / fill cycles - up to 30 ft3 (0.84 m3)Vacuum filtration up to (2) 6 funnel manifolds; Lab automation - aspiration of systems utilizing 96 / 256 well format; Welchnet lab installations up to 20 outlet fixtures (geneneral use, filtration)
TypeLaboratory Vacuum PumpLaboratory Vacuum PumpLaboratory Vacuum PumpLaboratory Vacuum PumpLaboratory Vacuum PumpLaboratory Vacuum PumpLaboratory Vacuum PumpLaboratory Vacuum Pump
Free Air Displacement cfm (l/min.) @60Hz0.39(11)0.76(22)1.2(34)1.6(45)2.1(60)3.5(100)3.5(100)7.1(201)
Free Air Displacement m3/hr (l/min.) @50Hz0.55(9.2)1.1(18)1.7(28)2.3(38)3.0(50)4.9(83)4.9(83)10(168)
Ultimate Pressure219(292)100(133)70(93)60(80)5(6.7)60(80)5(6.7)60(80)
Maximum Vacuum21.32627.227.629.827.629.827.6
Max Pressure PSIG (pascal)33(3.3 x 105)100(106)50(5 x 105)100(106)    
Motor Horsepower (watts)1/30(25)1/8(93)1/8(93)1/4(190)1/3(250)1/3(250)1/3(250)1/3(250)
Adjustable Vac. / Gas Ballast YesYesYesYesYesYesYes
Tubing Needed3/16(5)3/16(5)3/16(5)3/16(5)1/4(7)1/4(7)1/4(7)1/4(7)
Intake Thread NPT3/16 in. Hose1/41/41/41/41/41/41/4
Overall Dimensions LxWxH in. (cm)7.6x4.5x7.5 (19.4x11.4x19.1)8.1x8.8x10 (20.6x22.4x25.4)8.1x8.8x10 (20.6x22.4x25.4)10x7.5x9 (25.4x19.1x7.7)17.3x6.5x10.5 (43.9x16.5x26.7)15.0x10x10 (38.1x25.4x25.4)17x7.5x12 (43.2x42.3x19.1)17x7.5x12 (43.2x42.3x19.1)
Ship Weight6(2.7)17(7.7)17(7.7)17(7.7)24(10.9)24(10.9)32(14.5)32(14.5)
Shipping Carton Dimensions LxWxH in. (cm)11x7x8.3 (28x18x21)15.3x12.3x12.7 (39x31x32)15.3x12.3x12.7 (39x31x32)15.3x12.3x12.7 (39x31x32)21x12x15 (53x30x38)21x12x15 (53x30x38)21x12x15 (53x30x38)21x12x15 (53x30x38)
Intake Catch Jar YesYesYesYesYesYesYes
Exhaust Catch Jar YesYesYes    
Adjustable Vacuum KnobKnobKnobKnobKnobKnobKnob
Adjustable Pressure YesYesYes    
Vacuum Gauge DialDialDialDialDialDialDial
Pressure Gauge DialDialDial