3.2 Application notes
The following conditions must be observed in selecting and installing the measurement devices:
- Appropriate selection of the installation location due to potential pressure gradients in the recipient
- Potential pumping effect of the sensors
- Sputter effect of cold cathode gauges
- Strong magnetic and electrical fields
- Bake-out of the equipment and the gauges when generating ultra high vacuum
- Selection of switching points for ionization gauges in such a manner as to avoid contamination
Cold cathode gauges can be easily removed and cleaned in the event of contamination. Bayard-Alpert immersion measurement systems can also be cleaned, with any defective components, such as heating filaments, anode gates or collectors, being replaced. Contaminated anode gates and collectors can cause significant measurement errors due to the charging effects.
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Pfeiffer Vacuum GmbH
Berliner Strasse 43
35614 Asslar
Germany
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Pfeiffer Vacuum GmbH
Berliner Strasse 43
35614 Asslar
Germany
T +49 6441 802-0
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