Browse Prior Art Database

Combined Immersion Heater Temperature Sensor and Bubble Stirrer

IP.com Disclosure Number: IPCOM000085085D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Reinhart, FM: AUTHOR

Abstract

Shown is a device designed to uniformly heat a liquid sample in a test tube to a desired temperature. To accomplish this, it is necessary during heating of the liquid to promote a vigorous stirring action so that all portions of the liquid are uniformly heated and to sense the temperature of the liquid.

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Combined Immersion Heater Temperature Sensor and Bubble Stirrer

Shown is a device designed to uniformly heat a liquid sample in a test tube to a desired temperature. To accomplish this, it is necessary during heating of the liquid to promote a vigorous stirring action so that all portions of the liquid are uniformly heated and to sense the temperature of the liquid.

As shown in Fig. 1, the device comprises a tube 5 that is flattened for insertion into a test tube 6. The width of the flattened section of tube 5 is less than the internal diameter of the test tube to provide clearance. A heater element 7 is contained in tube 5 and has a width less than the internal width of the flattened tubing, to provide two channels through which an inert gas may be passed.

The bottom end of tube 5 is closed by a plug 8 and is displaced from heating element 7. A transistor chip 9 is mounted on plug 8 and serves as a sensor for controlling the temperature of the liquid, the walls of the tubing 5 being relatively thin to minimize the conduction of heat from element 7 to chip 9.

A series of holes 10 extend across one side of the lower end of tube 5 and allow gas to flow downwardly thru the side channels and out the holes 10. The bubbles rise along one side of tube 5 to produce a vigorous lifting action that causes the liquid to circulate as shown in Fig. 1. Cooling can be done by bubbling a cold inert gas through the stirrer into the sample. The tube 5 may be of stainless steel or s...