Monitors Model 241 Liquid Helium Level Monitor Features Works with most superconductive NbTi level sensors. The Model 241 Liquid Helium Level Monitor is used with a NbTi superconducting filament sensor to measure liquid helium level.
Level is displayed in inches, centimeters or percent.
Audio alarms indicate when the level has gone below a programmed minimum level during normal operation or when the level has exceeded a programmed maximum level during a fill operation. A level measurement is initiated after a timed period or as the result of a front panel or remote read command. During a level measurement, the sensor excitation current is applied and the resulting sensor voltage is conditioned and digitized by a high resolution analog to digital converter. This voltage reading is then converted to an equivalent level based on the active sensor length and sensor characteristics stored in non-volatile memory. The computed level is displayed on the front panel and the alarm status is updated at the end of the measurement interval.