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A pressure-operated safety circuit for use in high-vacuum serum-drying plants
Published online by Cambridge University Press: 15 May 2009
Extract
A form of Pirani vacuum gauge is described for obtaining a continuous record of the total residual pressure in a high-vacuum serum-drying cylinder of the Greaves-Adair type. The circuit incorporates an automatic relay which breaks the electric current heating the frozen serum if the pressure rises to a dangerous level, and so delays materially the onset of fusion of the serum.
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- Copyright © Cambridge University Press 1944