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  Home > JCE Print > Journal of Chemical Education > Issues > 1998  > September  >
In the Laboratory
A Solid-State Water Flow Fault Safety Switch for the Chemical Laboratory
Jonas Gruber and Rosamaria Wu Chia Li
Instituto de Química da Universidade de São Paulo, Caixa Postal 26077-CEP 05599-970, São Paulo-SP, Brazil

Isaac Gruber
Eaton, Cutler Hammer do Brasil, Diadema-SP, Brazil

Cover
September 1998
Vol. 75 No. 9
p. 1132
Abstract
A low cost solid-state water flow fault switch with a thermal sensing device is described that cuts the electric power of the heating element, normally employed in distillation and reflux devices, whenever their cooling water streams are impaired. This to prevent any possible escape of distillate vapours which may be toxic or flammable. The use of a solid-state relay provides entire isolation between the low voltage circuits and that of the power line, as well as no arcing during the on/off process which makes it safe for use in chemical environments. The apparatus also includes optional light and sound alarms.
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*  Citation
 Gruber, Jonas; Li, Rosamaria Wu Chia; Gruber, Isaac. J. Chem. Educ. 1998 75 1132.
*  Keywords
 safety, hazardous materials, instrumental methods, laboratory equipment, apparatus
*  History
 Created:
Last Updated:		 June 21, 1999
November 22, 2005
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