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Starting Procedures
3.10
Qualifying your Application
3.11
Welch GEMINI
solvent-based applications. Proper GEMINI
upon use with compatible application fumes, use of a trap to minimize chemical pull-through, and
prompt cleanup to purge chemicals from the pump.
Fumes that will be compatible with your GEMINI
applications as well as certain alcohols (ethanol, isopropanol ) and carboxylic acids (acetic acid).
It is important to check for pump material compatibility with potential fumes that can be drawn
off your vacuum application. Failure to follow chemical compatibility guidelines can result in
severely reduced pump service life.
The critical materials to check for chemical compatibility are the surface contact materials in your
™
GEMINI
pump. These materials are:
For handling harsh chemical fumes, Welch recommends use of pumps with PTFE-based
contact surfaces. Contact your Welch representative for information about D F
D F
U
SECTION 3: OPERATION
™
pumps are designed for intermittent use in a variety of aqueous and organic
1. Viton
2. Polyarylamide
™
, and Self-Cleaning Dry Vacuum Systems
™
pump operation and service life are dependent
™
pump include neutral pH aqueous
™
.
7
™
,
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