Direct-Drive High Vacuum Pump 8905A

Direct-Drive High Vacuum Pump 8905A
Code: 8905A
Vendor: Welch
MSRP: $2,265.00
Price: $1,925.25



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Product Details

Direct-Drive High Vacuum Pump 8905A

Welch Direct-Drive High Vacuum Pump 8905A


The Welch Direct-Drive High Vacuum Pump 8905A is a compact high vacuum pump ideal for use with the Shel Lab Model 1425 Series 0.6 cubic foot capacity vacuum oven.

For many applications, Welch Dry Vacuum Pumps will provide drying speeds equal to those of traditional, oil-seal pumps.  This means you can upgrade to a cleaner vacuum pump that is easier to maintain.

Suitable samples include: Foods (Nuts, Cheeses, Fruits, etc), Cosmetics, wet or surface-coated samples needing moisture dryoff, chemicals drying, solvent evaporation, and many others. If your samples can be processed at 3 torr – 10 torr pressure levels, a dry pump will work well in 0.67 cubic foot, 1.7 cubic foot, and even 4.5 cubic foot capacity Shel-Lab Vacuum Ovens.

For electronic component bakeout, curing, or other samples requiring pressures of 1-3 torr, Welch Chemstar, DuoSeal (Belt Drive) and Direct Drive Oil-Seal High Vacuum Pumps are excellent choices for all size vacuum ovens.


  • 1.8 CFM (3.1 m3/hr.)
  • Small footprint
  • Gas ballast, Unibarb, dowelled
Free Air Displacement

CFM (L/min) @ 60Hz


(L/min) m3/hr @ 50Hz

Ultimate Pressure (Torr) 2x10-3
Sound Level, dBA 52
Motor/Pump Speed (60 Hz) 3450
Motor Horsepower 1/4
Oil Capacity, qt. (liters) 0.42(0.4)
Tubing Needed, I.D. in.1 3/16
Intake Connection Unibarb
Exhaust Connection2 Thread
Weight, lbs (kg) 24.5(11.1)
Dimensions LxWxH in. (cm) 14.1x5.1x8.4
Ship Weight, lbs (kg) 24.5(11.1)
Shipping Carton Dimensions
LxWxH in. (cm)

5. Two-stage pumps should not be operated continuously at pressures above 10 Torr.

6. Exhaust filters not included. See Accessories - Exhaust filters for selection.

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