Development of an Ionization-Type Gas Density Monitor. Final Report

摘要

A battery-operated electronic gas density monitor has been developed for SF sub 6 service in gas-insulated substation equipment that is based on principles similar to ionization-type fire alarms. The monitor has a resolution of 0.1 psia at 68 exp 0 F and exhibits a linearity of from +-0.15 to +-0.6 psia at 68 exp 0 F over the pressure range 30 to 75 psia, depending on ion chamber characteristics and operating voltage. A prototype unit exhibited a deviation from ideality of about 0.01% per degree Fahrenheit over the temperature range -30 exp 0 to 105 exp 0 F and was found insensitive to water vapor in SF sub 6 at levels in excess of 1000 ppM. (ERA citation 06:009129)