A simple inexpensive cryogenic liquid level controller

✍ Scribed by A Bose; J Sthanapati; A.K Ghoshal; D Pal; A.K Pal

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 75 KB
• Volume: 14
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(74)90011-3

✦ Synopsis

For automatic level regulation of cryogenic liquids in dewar vessels reports of devices using different kinds of level sensors such as capacitance, gas-bulb, and resistance have been published. This note describes a very simple and inexpensive cryogenic liquid level controller which utilizes the forward resistance property of a germanium diode. The operation of the controller, relevant solid-state circuitry, (Fig. ) and other particulars are as follows.