Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Pirani <strong>vacuum</strong> gauge<br />
• A heated wire res<strong>is</strong>tor in a gauge tube.<br />
• A second wire res<strong>is</strong>tor in a closed reference tube.<br />
• The two wire res<strong>is</strong>tors are 2/4 of a Wheatstone bridge.<br />
• Higher pressure cools the wire and res<strong>is</strong>tance drops.<br />
• The pressure <strong>is</strong> measured from the<br />
unbalanced bridge .<br />
• Pirani gauge works well for pressure<br />
10 1 to ~10 -5 mbar.
Change language