Abstract: A unique valve mechanism for opening and closing inlet, outlet, and purge valves in a regenerative incinerator is disclosed. The valves are mechanically opened and closed by a cam arrangement which insures proper timing, and optimal volume flow through the valves during each cycle. Further, a method of the present invention begins the purge mode while the inlet valve is opened, and completes it after the outlet valve has opened. This reducing the required time for each cycle of operation.

Abstract: A modular clean room structure in which the interior is finished without any seams between adjacent modules or crevices at the corners of the room such that the room can be easily sterilized. The seamless nature of the interior surface of the clean room eliminates locations where moisture can accumulate and promote bacteria growth. A cove is used to finish the corners of the room with a larger radius curve blending smoothly into adjacent flat surfaces. A durable coating is applied continuously over the ceiling, side walls and floor of the clean room to provide a seamless interior surface.

Abstract: A vehicle ignition signal is sensed and digitized for subsequent display on a display device, the digitization comprising sampling the sensed signal at a number of predetermined time intervals, all shorter in duration than an interval determined by the display device resolution, to determine a signal transition to a maximum spark value, to determine the maximum spark value, and to determine the sample within each display resolution interval having the greatest absolute value displacement from that of the determined sample from the previous resolution interval, the determined sample and the maximum value sample being displayed on the display device.

Abstract: An non-intrusive tachometer for measuring engine RPM includes a hand-held probe having an antenna for sensing radio frequency electromagnetic signals radiated from an operative spark ignition engine. The probe includes means for providing a pulse signal indicative of plug firing events to signal processing means which executes a statistical algorithm to determine the time between spark plug firings and engine RPM. A visual display displays engine RPM. Automatic gain contol means provides the pulse signal with a relatively constant amplitude by compensating for the inherently wide variation in amplitude of the electromagnetic signals among different automobile ignition systems. The signal processing means and display are located separate from the probe in an emissions testing system, or the signal processing means and display are integrated within the probe.

Abstract: Vehicle parameters are sensed at each of a plurality of engine speeds and are used to calculate different type vehicle performance signals, which are displayed together in a rectangular coordinate system having an engine speed axis and axes perpendicular thereto, one for each different type of vehicle performance signal, each performance signal being displayed in alphanumeric characters and connected with line segments, to identify the type of performance signal.

Abstract: A modular clean room load bearing structure having a negative air pressure plenum above the clean room ceiling to prevent the collection of dust and dirt above the ceiling. The vertical sidewall of the clean room is constructed of individual wall modules which are assembled together on site to construct the clean room. Each wall module serves as a return air duct for circulating air from the clean room upwardly through the wall module to the negative pressure plenum where the air is drawn out to a HVAC unit for conditioning the air. The conditioned air is returned to the clean room through a supply air duct system which includes HEPA filters in the clean room ceiling which filter the air immediately prior to the air being blown into the clean room. A support deck spans across the top of the sidewall and is formed by four foot wide structural panels spanning across the clean room. The deck supports the HVAC equipment above the deck while the clean room ceiling and HEPA filters are suspended from the deck.

Abstract: A method of removing low levels of ethylene oxide (1% by volume or less) from ethylene oxide contaminated gases is provided. The removal is effected by contacting the ethylene oxide with a solid, cationic ion exchange resin at conditions such that the quantity of water present in the reaction zone is at a level such that the reaction of the ethylene oxide with resin occurs at a gas-solid interface to form an ethylene oxide derivative polymer which is bound to said resin.

Abstract: A gas mask filter material is described comprising a dried acidic ion exchange resin which is effective in removing low levels of ethylene oxide from air contaminated therewith. Specifically described is a gas mask filter comprising a cross-linked polystyrene resin with sulfonic acid functionality that contains less than about 20 percent by weight water.