DIGITAL LEVEL INDICATOR FOR LIQUID NITROGEN

摘要

Liquid Nitrogen has wide range of applications in several areas such as aerospace, defense and industries. Specially built Cryogenic containers are used for its storage and transportation. We have developed an MCS-51 family based circuit for measuring the level of liquid Nitrogen inside a cryogenic containers. The liquid nitrogen serves as a dielectric layer in a cylindrical capacitor. The system has a LCD display and hence directly displays the liquid Nitrogen either by volume, or by the height of the liquid column, by a keypad. The measurement accuracy is ± 1mm. The unit is highly reliable, very compact and is operated by a 9V battery.