The SPC Series Digi-Span senses temperature, pressure, or humidity and provides a single-pole, double-throw output. It can be used whenever on/off or two-position control is desired, according tot he company. Typical applications include two-position valve actuators, two-position damper actuators, pump start/stop, temperature alarms, boiler control, chiller control, and radiant heat. Standard features include pressure ranges from 0 to 30, 0 to 100, or 0 to 200 psi and humidity range from 0% to 100% rh.
— Heat-Timer Corp.