Housed in 2.95 x 1.30 x 2.52 in. enclosure with operating temperature of -40 to 2,012°F, Series 3699A and 3699B provide exact sensing and control of heating, cooling, and humidity. Units support Thermocouple, NTC thermistor, and external switch inputs, as well as selectable operation modes of ON/OFF, ON/OFF with defrost, Timer or PID, which enable user to fine-tune device to meet application. Output choices include SPST relay rated at 10 or 3 A or 12-24 Vdc for external SSR and buzzer alarm.<br />
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