Welch Vacuum 2028 Self-Cleaning Dry Vacuum System - Manual (Page 17)

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3.70 Inlet and Outlet Separators (all Models)
The glass inlet separator helps protect the diaphragm pump inside the system from ingesting liquids
or particulates. The outlet separator catches any liquid or particulates ejected while the pump is running
and when its is operating in the self-cleaning purge cycle. See Section 2.30 for more information about
trapping.
WARNING
Always wear safety gloves that are designed for handling glass
when removing the inlet or/and exhaust jars.
Cracked or defective jars can break when being removed.
3.80 Unit Start Procedure and Operation
NOTE
Pump will not reach Ultimate Vacuum Pressure
until pump has been run and warmed up.
3.81 Starting a Welch Vacuum System
Before attaching the Self-Cleaning Dry Vacuum System to a rotary evaporator, concentrator or gel
dryer it is important to familiarize yourself with the function, features and action of the Self-Cleaning Dry
Vacuum System which you have acquired. Review the power requirements as described in Section 2.20,
Electrical Power Welch recommends running the system for a few minutes to warm it up before use. The
warm-up improves the pumps ability to pass water and organic vapor. A warm pump will handle more
vapor without liquefying it than a cold pump.
3.82 Cleanliness
Take every precaution to prevent foreign particulates or liquid from entering the pump. Particulates or a
fl ow of liquid will damage the pumps performance. See Section 2.30 for information on the use of Traps.
3.83 Leak Detection
The importance of eliminating all leaks in a vacuum system is obvious. The pump must remove this
added volume of leaked gas to maintain the desired vacuum. Leaks in the application can be located by
slightly pressurizing the system and painting the suspected area with a thick soap solution. Escaping air
will produce soap bubbles.
3.84 Operating Pressure Range
The Self-Cleaning Dry Vacuum System is designed to be run from slightly below atmospheric to 2 Torr
(2.7mbar, 29.8 in Hg) See Section 7, specifi cation list for the complete specifi cations for your unit.