Abstract: A capacitance probe having a relative thin profile and large cross section for use in short yet relatively large diameter desiccant beds is formed from two substantially identical members, each having a network of strip elements electrically and structurally connecting a plurality of plate elements. Upon inverting and rotating one member with respect to the other member, the plate elements of one member are interleaved with the plate elements of the other while leaving enough space to accommodate a sufficient volume of sorbent to serve as the dielectric. The probe may be employed with supporting circuitry to detect the advance of the moisture front as a change in dielectric constant of the sorbent. There is also provided a system to connect the two members in nonconducting relation so that a rigid structure results.

Abstract: A method of operating a microcomputer for controlling a heat-reactivated dual-chamber gas adsorber ensures safe and reliable operation of the adsorber by recovering from disruption of the microcomputer execution sequence and sensing failure of the power control components which enable regeneration of the adsorbent. A non-volatile memory stores a code designating the "active-task" or subdivision of the adsorber cycle being controlled by the microcomputer. A reset circuit includes a watchdog timer responsive to disruption of the microcomputer's execution sequence. Upon reset of the microcomputer, the hardware components are set to an initial state and checked before resuming execution of the interrupted task. A purge circulation blower, for example, is turned on in the event that the heater cannot be turned off.

Abstract: A series of valves are disclosed which are specially designed for use in desiccant dryers. Each of the valves utilizes a housing (12), fabricated of standard pipe components and communicating flanges (13, 14) in conjunction with a poppet (24) and seat (20) arrangement. A support (30) fixed to one side of the interior of the housing carries an axial rod (23) to which the poppets (24) are mounted. Two- and three-way valves include a piston (36) and cylinder arrangement within the support to actuate the poppets. The poppet (224) of the check valve (200) is actuated automatically in response to pressure differentials across the poppet.