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The Types 622A, 623A, and 626A Baratrons are unheated,and thus are the most economical of all of the 600-series family of products. They are available in full-scale pressure/vacuum ranges from 0.1 to 1000 Torr （and metric equivalents） and are suited for many industrial, electronic, and research applications. The 622A has a terminal block electrical connector without relays, the 626A uses a 15-pin D-subminiature electrical connector without relays, and the type 623A product adds two （2） independently-adjustable trip relays to control external equipment.