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Section 9: APPLICATION INFORMATION
9.10 VACUUM SYSTEM FOR VACUUM CHAMBER, GLOVE BOX, ANNULAR SPACE &
TRANSFER LINE
-2561B-50
-2561C-50
-2561C-56
9.20 SYSTEM
COMPONENTS*
Item
No.
Catalog No.
Description
1
-
PTFE Coated Aluminum Lid
2
-
Vacuum Regulator
3
-
PTFE Encapsulated Gasket
4
-
Metal Intake Hose Barb for 3/8” ID Hose
5
-
Kynar Hose Barb
6
1415B
Glass Jar, Inlet Trap
1415C
Plastic Jar, Inlet Trap
7
726021
Vacuum Gauge, in. Hg, cm Hg
726024
Vacuum Gauge - mbar/kPa
726025
Pressure Gauge - psi/kgcm
8
2561B-50
Vacuum System 115V 60Hz 1Ph
2561C-50
Vacuum System 230V 50/60Hz 1 Ph
2561C-56
Vacuum System 100V 50/60Hz 1 Ph
9.30 SYSTEM
OPERATION
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 fl uids 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.
Models 2561B-50, 2561C-50 & 2561C-56 are suited for 1.5 cubic foot ovens or smaller.
The pumping speed of the 2561 at rough vacuum levels is equal to oil-seal rotary vane pumps
of similar size. This makes the 2561 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
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.
* System components available as kit Cat. No. 2565K-50
