An automatic controller for filling and maintaining liquid nitrogen levels in Dewars

Andrew J. Murray; Steven Atkinson

doi:10.1088/0957-0233/15/5/N01

An automatic controller for filling and maintaining liquid nitrogen levels in Dewars

Research output: Contribution to journal › Article › peer-review

Abstract

A controller for filling and maintaining the level of liquid nitrogen Dewars is described, which has been used in experiments where the boil-off rate is large due to the proximity of an atomic beam oven to a beam dump cooled by the liquid nitrogen. The control system uses either a pair of copper-constantan thermocouples, or a pair of green LEDs to monitor the upper and lower levels of the filled Dewar. The level of the Dewar is then maintained between these two detectors. The controller is simple to build and is inexpensive, thereby making it accessible to many undergraduate and research laboratories. © 2004 IOP Publishing Ltd.

Original language	English
Pages (from-to)	N31-N34
Journal	Measurement Science and Technology
Volume	15
Issue number	5
DOIs	https://doi.org/10.1088/0957-0233/15/5/N01
Publication status	Published - May 2004

Keywords

Electron spectrometer
LED sensor
Level controller
Liquid nitrogen Dewar
Thermocouple

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10.1088/0957-0233/15/5/N01

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abstract = "A controller for filling and maintaining the level of liquid nitrogen Dewars is described, which has been used in experiments where the boil-off rate is large due to the proximity of an atomic beam oven to a beam dump cooled by the liquid nitrogen. The control system uses either a pair of copper-constantan thermocouples, or a pair of green LEDs to monitor the upper and lower levels of the filled Dewar. The level of the Dewar is then maintained between these two detectors. The controller is simple to build and is inexpensive, thereby making it accessible to many undergraduate and research laboratories. {\textcopyright} 2004 IOP Publishing Ltd.",

keywords = "Electron spectrometer, LED sensor, Level controller, Liquid nitrogen Dewar, Thermocouple",

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AB - A controller for filling and maintaining the level of liquid nitrogen Dewars is described, which has been used in experiments where the boil-off rate is large due to the proximity of an atomic beam oven to a beam dump cooled by the liquid nitrogen. The control system uses either a pair of copper-constantan thermocouples, or a pair of green LEDs to monitor the upper and lower levels of the filled Dewar. The level of the Dewar is then maintained between these two detectors. The controller is simple to build and is inexpensive, thereby making it accessible to many undergraduate and research laboratories. © 2004 IOP Publishing Ltd.

KW - Electron spectrometer

KW - LED sensor

KW - Level controller

KW - Liquid nitrogen Dewar

KW - Thermocouple

U2 - 10.1088/0957-0233/15/5/N01

DO - 10.1088/0957-0233/15/5/N01

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VL - 15

SP - N31-N34

JO - Measurement Science and Technology

JF - Measurement Science and Technology

IS - 5

ER -

An automatic controller for filling and maintaining liquid nitrogen levels in Dewars

Abstract

Keywords

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