An Evaluation of the Rand Flow Indicator as a Warning Device in the Constant-Mass-Flow Supply Circuit of a Semi-Closed Circuit Scuba.

摘要

The evaluation considers the principle of operation and adequacy of an apparatus submitted as a warning device for insertion in a mixed-gas scuba gas supply circuit wherein the gas is supplied at constant-mass rate independent of depth of dive. The device was found to be satisfactory in principal but,in its prototype form,not adequate for use at flow rates and depths experienced in operational mixed-gas diving. Extensive calibration curves are presented as well as results of its operation when used in a constant-mass-flow circuits. (Modified author abstract)