103
p r i n c i p l e s o f o p e r a t i o n / t h e o r y
r
Tonometered Reagents
The reagent module contains reagents that have been tonometered to
known partial pressures of PO
2
and PCO
2
.
Tonometry is the process of bubbling a gas through a liquid until equi-
librium is reached. Equilibrium is when the partial pressures of the
gases dissolved in the liquid equal the partial pressures of the gases
bubbled through the liquid. The tonometered liquid is then placed into
hermetically sealed reagent modules.
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