Panel Mount Controller

This panel mount controller is a modular gauge with solid-state construction and a taut-band meter. It provides pressure measurements over the 0-5 and 0-50 Torr ranges, and the dual-scale meter faces also provide millibar readings. It uses a noble metal thermopile circuit, and the hot junctions of the thermopile are heated directly by an AC current. This is done while an equal number of cold junctions are kept at ambient temperature by heavy mounting studs, thus generating a DC voltage between hot and cold junctions. As the pressure decreases, the lowering of the thermal conductivity of the gas surrounding the hot junctions tends to increase the temperature of the hot junctions, thus increasing the output of the thermopile.

Teledyne Hastings Instruments, P.O. Box 1436 Hampton, VA 23661 Phone: (757) 723-6531 Fax: (757) 723-3925