Section 3: OPERATION
3.10 Starting Procedures
3.11 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.
3.12 Cleanliness
Take every precaution to prevent foreign particulates or liquid from entering the pump. Particulates or a flow of
liquid will damage the pumps performance. If you find that large quantities of particulates or liquid will come off
the process during evaculation, a simple liquid trap can be made out of readily available material for protecting
the pump. The trap would consist of a filtering flask placed between the pump and the vacuum chamber. The
simple liquid trap will act as a buffer for the inlet separator connected to the Self-Cleaning Dry Vacuum System.
3.13 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.
3.14 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 6, specification list for the complete specifications for your unit.
3.15 Operating Instruction for 2028
MANUAL
VENT
AUTO
Anti BUMPING/FOAMING
MENU
MAXIMUM VACUUM
NUMERIC KEY PAD
UP/DOWN ARROWS
VACUUM CONTROL
KNOB
Push to select menu options
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