Liquid nitrogen auto-fill

11/01/1996

Liquid nitrogen auto-fill

The LC3 controller maintains the LN2 level between user-defined setpoints in coldtraps and dewars. The liquid level is measured with a capacitive probe and displayed on the front panel with 0.1% precision. Level control is achieved by actuating a cryogenic solenoid valve. Standard features include a backlit display, audible alarm, analog output, manual override, and auto-dial phone support. All user setpoints are stored in nonvolatile memory. An RS-232 interface allows remote monitoring and control. Applications include cryogenic detectors, cold traps, cryopumps, and LN2 jackets. Teragon Research, San Francisco, CA; ph 415/664-6814, fax 415/664-6745.