Title: Moisture sensing systems for electrically operated liquid-handling devices

Abstract: A fraction collector or other electrically operated liquid-handling device has a tray underlying the device for collecting spilled liquid. A pitched surface in the tray gathers any spilled liquid into the vicinity of a sensor having a moisture-destructible or sensitive element which holds a switch against the force of a spring in a closed-circuit position, allowing power to be fed from a current source to the electrically operated device. Upon wetting and destruction of the element the spring is relieved to open the switch, thereby cutting off the power and stopping the operation of the liquid-handling device.

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Inventors: Gelfand, Daniel (Cliffside Park, NJ, US)

Application Number: 472901
Filing Date: 1974-05-23
Publication_date: 1976-03-16
Assignee: Buchler Instruments, Div. of Searle Analytic, Inc. (Fort Lee, NJ)
Primary Class(es): 141/192 137/312, 141/130, 200/61.04
Other Classes:
US Patent Ref:

1174827	Mar, 1916	Conway	200/61.
2482448	Sep, 1949	Wiest	200/61.
2531159	Nov, 1950	Rowell	137/312.
3205921	Sep, 1965	Packard et al.	141/130.

Other Refs:
Primary Examiner: Aegerter, Richard E.
Assistant Examiner: Schmidt, Frederick R.
Attorney: Ross; Karl F., Dubno; Herbert