Abstract: An environmental chamber includes an ultrasonic nebulizer assembly for controlling the relative humidity within the chamber. The ultrasonic nebulizer assembly is connected in closed-loop fluid communication with an enclosed chamber of the environmental chamber and includes an ultrasonic nebulizer module to generate water vapor that is introduced into the enclosed chamber. The ultrasonic nebulizer module is constructed to be immersed in water within the ultrasonic nebulizer assembly and is readily replaceable by the user. A nebulizer hour timer is provided to monitor the length of time of the ultrasonic nebulizer is operating to provide a precise indication to the user of how much life is left in the ultrasonic nebulizer before it needs to be replaced.

Abstract: A platform shaker for use in a CO2 rich environment that has a corrosion resistant output shaft and a corrosion resistant, sealed motor casing. An eccentric drive assembly is connected between the output shaft and a platform and has components treated with a corrosion inhibiting coating. A shaker control controls the electric motor has components treated with a conformal coating.

Abstract: A modular cell tray assembly comprising a series of cell trays stacked one upon the other and each containing a plurality of sealed lead-acid cells is disclosed in which the cell trays provide cell tray interlocks and load distribution structure that satisfy Zone 4 requirements, achieve cell tray interlocking by a boltless pin and provide frontal access to the cells.