The technology of fluidics has frequently been advertised as being a solution to environmental problems encountered with more conventional control techniques. However, those applying fluidics to control problems soon discover that fluidic components have their own peculiar sensitivity to changes in the environment. This paper describes the typical environmental sensitivity of fluidic proportional and digital amplifiers, and provides a method for predicting this sensitivity based on the amplifier’s dependence on Reynolds Number. The principal performance parameters considered are gain, noise and null shift. The sensitivity of these parameters to supply pressure, fluid temperature and altitude or reference pressure is described. Both liquid and gaseous fluids are considered.

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