Thermal environmental monitoring of divers using a twelve channel multiplexing instrument.

A 12-channel temperature monitoring instrument designed for use by divers while immersed or within pressure chambers is described. Data are multiplexed at the diver and transmitted to the surface, bell, submarine, or chamber exterior through a two-core electrical cable. In the case of the immersed diver the cable may be incorporated into the diver's umbilical cable. Details of the method and special construction techniques used in the design of the diver-borne multiplexer are given. At the dive control station the 12 individual temperatures may be displayed in either digital or analogue format. The temperature data may also be stored on one track of a battery-powered magnetic tape recorder for subsequent off-line analysis.