초록 ▼

A system adapted for removable placement in a security enclosure fitted into the wall of a refrigerated container for respiring perishables, and for monitoring and controlling, continuously and dynamically, over a programmed, desired time, the concentration of oxygen, and the concentration of dioxid

A system adapted for removable placement in a security enclosure fitted into the wall of a refrigerated container for respiring perishables, and for monitoring and controlling, continuously and dynamically, over a programmed, desired time, the concentration of oxygen, and the concentration of dioxide, in such a container atmosphere where the concentrations of these gases vary over time as the perishables respire, includes devices for sensing, separately, the concentrations of oxygen and carbon dioxide in the container atmosphere, devices for establishing setpoints or desired values of oxygen and carbon dioxide atmospheric concentration within the container, and for changing those setpoints, over time, depending on the nature of the perishable and other variables, and for maintaining the atmospheric concentrations of oxygen and carbon dioxide at desired setpoints for desired programmed times by admitting outside air into the container, as a source of oxygen, and by scrubbing to remove carbon dioxide, as necessary.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for determining the concentration of carbon dioxide in a gas mixture that includes carbon dioxide, comprising: housing means forming a chamber permeable to gas mixtures and carbon dioxide; mounted within said housing in said chamber, a container having two ch

[ What is claimed is:] [1.] An apparatus for determining the concentration of carbon dioxide in a gas mixture that includes carbon dioxide, comprising: housing means forming a chamber permeable to gas mixtures and carbon dioxide; mounted within said housing in said chamber, a container having two chambers, with the first of said chambers substantially impermeable to gases entering said space, the second of said chambers having an opening to admit gases entering said chamber; each of said chambers including a thermistor, said thermistors being adapted to be maintained at substantially the same current; and means for detecting signals from said thermistors to determine said carbon dioxide concentration.