Abstract: An electronic auscultation system and method for simulating sounds arising from human organs for use in an anatomical simulation device including a patient simulating mannequin torso, a plurality of electro-magnetic transmitters having antenna coils positioned in predetermined locations relative to said torso beneath the torso surface and each transmitter being connected to one or more computer sound cards which, upon activation, generate signals from prerecorded sound data which generates the appropriate sounds of human organs based on the transmitter location. The system utilizes a simulated stethoscope that includes a receiver and/or sensing triggering devices so that the stethoscope can determine particular areas on the torso to define the appropriate sound generated such that the system knows where the stethoscope is.

Abstract: A microcomputer-based programmable control system for desiccant air dryers monitors the level of moisture saturation of the desiccant beds and adjusts the regeneration cycle accordingly to optimize energy efficiency. The moisture sensors have capacitance probes and adjustable resistors as frequency determining components for precision oscillators. A multiple counter integrated circuit is controlled by the microcomputer to establish a predetermined time interval and to count cycles of the precision oscillators during the predetermined time interval to obtain final counts for each probe indicative of the level of moisture saturation in the respective desiccant beds. The microcomputer compares the final counts to predetermined threshold number in order to determine whether a regeneration cycle is required, and also compares the final counts to maximum and minimum threshold numbers to detect and indicate probe failure.

Abstract: A pneumatic controller is provided for a two-bed adsorbent fractionator, particularly a heaterless dessicant dryer, having pneumatically controlled inlet and exhaust flow valves and, optionally, a repressurization valve. The flow valves are controlled by a schedule of pneumatic pilot signals generated by the controller from a source of pressurized gas, e.g., gas tapped from and at the line pressure of the outlet of the fractionater. Control valves within the controller selectively apply the full pressure from the source as pilot signals to the flow valves of the fractionater. A variable regulated pressure is utilized to control these control valves according to a schedule established by the time periods to fill two timing volumes through variable orifices.