Abstract
Small, steady-state departures from zero reference in servonulling pressure measuring systems were determined under static conditions by immersing the tips of microcannulae into a normal saline solution at atmospheric pressure. These positive and negative deviations from atmospheric pressure appearing when the servo loop is closed, are independent of changes in concentration of NaCl in the test solution and consequently not related to diffusion phenomena. Such dependence is precluded by thermodynamic considerations that would require a nonzero reflection coefficient for NaCl as a property of the microcannular tips. Therefore, the small steady-state departures from zero can undoubtedly be traced to a hydraulic defect in the system.
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