Welch Vacuum 2581B-50 WOB-L Pinston Pump User Manual
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Section 7: APPLICATION INFORMATION
7.20 Vacuum System for Vacuum Chamber, Glove Box, Annular Space & Transfer Line:
- 2581B-50
- 2581C-50
- 2581C-56
7.21 System Components
7.22 Vacuum System for Cell Harvesting:
Welch’s new portable oil-free general utility roughing pumps provide continuous, reliable vacuum that
your vacuum chamber, glove box, annular space and transfer line applications require. The pumping
mechanism is an economical twin head oil-free Wob-L® known for reliability and durability. These
rugged pumps handle 20,000 plus roughing cycles – from atmospheric to 5 Torr – before needing seal
maintenance.
The pumps come completely equipped and ready to use. An inlet trap to help prevent ingestion of fluids
into the pump, a dial gauge for continuous vacuum level monitoring, and a vacuum regulator to adjust
vacuum levels. Just plug it in and you’ re up and running.
Choose Model 2581B-50 for evacuating vacuum ovens, annular spaces, transfer lines and purging a
glove box up to 30 cubic feet. For Vacuum Ovens, Model 2561B-50 is suited for 1.5 cubic foot ovens or
smaller and Model 2581B-50 can be used for up to 3.5 cubic feet.
The pumping speed of the 2561 and 2581 at rough vacuum levels is equal to oil-seal rotary vane pumps
of similar size. This makes the 2561 and 2581 an economical, oil-free solution for replacing oil-seal
rotary vane pumps. These pumps are therefore highly recommended for standard duty laboratory
applications, general vacuum work and where quick roughing of a chamber is needed.
The 2581 and 2561 pump Models are for use in standard duty applications. This means that they are not
recommended for pumping acidic, basics or organic vapors or gasses. If you are looking for a pump to
handles these types of conditions, contact a Welch representative and they will be able to assist you in
selecting the correct pump for your application.
Qty.
2581
Description
1
61-3576
Jar Assembly
1
61-5142
Needle Valve Miniature
1
61-5148
Instrument Knob
1
624280
Hose Barb, 3/8” NPT
1
66-0136
Hose Barb, Male Straight Kynar
1
62-1066
Nipple Hex 3/8” x 1”
1 or 1 638788
Vacuum Gauge, kPa / in. Hg.
633210
Vacuum Gauge, cm Hg. / in. Hg.