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Electronic Humidity Element for Measurement of Relative Vapor Pressures^{1, 2,}

Department of Dairy Industries, University of Minnesota, St. Paul

ABSTRACT

A method that has been useful in evaluating the water sorption of milk proteins is reported herein. It is based on the measurement of relative vapor pressures by a lithium chloridepolyvinyl alcohol, electronic, humidity-sensing element.

The operating setup of the equipment used in the determination of relative vapor pressure is shown in Figure 1. The microammeter on the left is connected to the humidity-sensing unit, attached inside the lid of the sample jar shown in the incubator. A more detailed description of the individual components follows.

Relative humidity-sensing elements. The relative humidity-sensing elements were developed and are manufactured by the Minneapolis-Honeywell Regulator Company, 2753 Fourth Avenue South, Minneapolis, Minnesota, and are referred to as Q-229AY Electronic Humidity Elements. They are described in that company's Applied Research Project 4799 Report 1.

Elements ranging from 12 to 99% relative humidity were used. Each element covers a short range of relative humidity to from 10 to 18%.

¹ Scientific Journal Series Paper No. 4569, Minnesota Agricultural Experiment Station, St. Paul.

² Data presented are taken from a thesis by the senior author submitted to the Graduate School of the University of Minnesota, in partial fulfillment of the requirements for the Ph.D. degree, August, 1960.

³ Present address: Robert A. Taft Sanitary Engineering Center, Cincinnati, Ohio.

⁴ Deceased.